AMSCO AS3661-BWLT

austriamicrosystems AG
is now
ams AG
The technical content of this austriamicrosystems datasheet is still valid.
Contact information:
Headquarters:
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
e-Mail: [email protected]
Please visit our website at www.ams.com
D ata s hee t
AS3661
P r o g r a m m a b l e 9- ch a n n el L E D D r i ve r
1 General Description
2 Key Features
Three independent program execution engines; 9
programmable outputs with 25.5 mA full-scale
current, 8- bit current setting resolution and 12-bit
PWM control resolution
Adaptive charge pump with 1x and 1.5x gain
provides up to 95% LED drive efficiency
Charge pump with soft start and overcurrent/short
circuit protection
Built-in LED test
Automatic power save mode; IVDD = 10 µA (typ.)
The AS3661 has an I2C-compatible control interface
with four pin selectable addresses. Also, the device has
a flexible General Purpose Output (GPO), which can be
used as a digital control pin for other devices. INT pin
can be used to notify processor when a lighting
sequence has ended (interrupt - function). Also, the
device has a trigger input interface, which allows
synchronization between multiple devices.The device
requires only four small and low-cost ceramic
capacitors.
Two wire, I2C-compatible, control interface
Flexible instruction set
Large SRAM program memory
Small application circuit
Source (high side) drivers
Minimum number of external components
Architecture supports color control
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The AS3661 is a 9-channel LED driver designed to
produce lighting effects for mobile devices. A highefficiency charge pump enables LED driving over full LiIon battery voltage range. The device is equipped with
an internal program memory, which allows operation
without processor control. The AS3661 maintains
excellent efficiency over a wide operating range by
autonomously selecting the best charge pump gain
based on LED forward voltage requirements. AS3661 is
able to automatically enter power-save mode when LED
outputs are not active, thus lowering idle current
consumption down to 10 µA (typ).
3 Applications
The AS3661 is available in a tiny WL-CSP-25
(2.285x2.285mm) 0.4mm pitch package.
The product is ideal for fun and indicator lights, LED
backlighting, and programmable current source.
Figure 1. AS3661 LED Driver Block Diagram
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Revision 1.3
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AS3661
Datasheet
Contents
1 General Description
............................................................................................................................ 1
2 Key Features
.......................................................................................................................................1
3 Applications
........................................................................................................................................ 1
4 Pinout
................................................................................................................................................... 5
..............................................................................................................................................5
4.2 Pin Description
...............................................................................................................................................5
5 Absolute Maximum Ratings
6 Electrical Characteristics
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4.1 Pin Assignment
............................................................................................................... 7
................................................................................................................... 8
8 Detailed Description
8.1 Programming
.........................................................................................................................14
...............................................................................................................................................14
.....................................................................................................................................14
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8.2 LED Error Detection
8.3 Energy Efficiency
.........................................................................................................................................14
8.4 Temperature Compensation
8.5 Modes of Operation
8.5.1
8.5.2
8.5.3
8.5.4
8.5.5
................................................................................................... 12
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7 Typical Operating Characteristics
........................................................................................................................14
.....................................................................................................................................16
RESET .................................................................................................................................................16
STANDBY ............................................................................................................................................16
STARTUP ............................................................................................................................................16
NORMAL ..............................................................................................................................................16
POWER SAVE .....................................................................................................................................16
8.6 Charge Pump Operational Description
8.6.1
8.6.2
8.6.3
8.6.4
8.6.5
8.6.6
8.6.7
........................................................................................................17
Overview ..............................................................................................................................................17
Output Resistance ................................................................................................................................17
Controlling the Charge Pump ...............................................................................................................18
LED Forward Voltage Monitoring .........................................................................................................18
Gain Change Hysteresis ......................................................................................................................18
Automatic Power Save Mode ...............................................................................................................19
PWM Power Save Mode ......................................................................................................................19
.............................................................................................................20
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8.7 LED Driver Operational Description
8.7.1 Powering LEDs ....................................................................................................................................21
8.7.2 Controlling the High-side LED Drivers ..................................................................................................21
8.8 I2C Compatible Control Interface
.................................................................................................................22
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2
I C Address selection ...........................................................................................................................22
Bus Not Busy .......................................................................................................................................22
Start Data Transfer ...............................................................................................................................22
Stop Data Transfer ...............................................................................................................................22
Data Valid .............................................................................................................................................22
Acknowledge ........................................................................................................................................22
Program Downloading ..........................................................................................................................25
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8.8.1
8.8.2
8.8.3
8.8.4
8.8.5
8.8.6
8.8.7
8.9 Register Set
.................................................................................................................................................25
8.10 Control Register Details
8.10.1
8.10.2
8.10.3
8.10.4
.............................................................................................................................35
ENABLE/ ENGINE CONTROL1 .........................................................................................................35
ENGINE CNTRL2 ..............................................................................................................................36
OUTPUT DIRECT/RATIOMETRIC MSB and LSB .............................................................................37
OUTPUT ON/OFF CONTROL MSB and LSB ....................................................................................38
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AS3661
Datasheet
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8.10.5 LEDx Control ......................................................................................................................................39
8.10.6 LEDx PWM .........................................................................................................................................45
8.10.7 LEDx CURRENT CONTROL .............................................................................................................48
8.10.8 MISC ..................................................................................................................................................51
8.10.9 ENGINEx PC ......................................................................................................................................52
8.10.10 STATUS/INTERRUPT .....................................................................................................................52
8.10.11 GPO .................................................................................................................................................54
8.10.12 VARIABLE ........................................................................................................................................54
8.10.13 RESET .............................................................................................................................................54
8.10.14 TEMP ADC CONTROL .................................................................................................................55
8.10.15 TEMPERATURE READ .................................................................................................................55
8.10.16 TEMPERATURE WRITE ...............................................................................................................56
8.10.17 LED TEST CONTROL ...................................................................................................................56
8.10.18 LED TEST ADC ............................................................................................................................57
8.10.19 ENGINE1 VARIABLE A .................................................................................................................58
8.10.20 ENGINE2 VARIABLE A .................................................................................................................58
8.10.21 ENGINE3 VARIABLE A .................................................................................................................58
8.10.22 MASTER FADER1 .........................................................................................................................58
8.10.23 49 MASTER FADER2 ....................................................................................................................59
8.10.24 4A MASTER FADER3 ......................................................................................................................59
8.10.25 ENG1 PROG START ADDR ............................................................................................................59
8.10.26 ENG2 PROG START ADDR ..........................................................................................................59
8.10.27 ENG3 PROG START ADDR ..........................................................................................................59
8.10.28 PROG MEM PAGE SELECT .........................................................................................................60
8.10.29 ENG1 MAPPING MSB ...................................................................................................................60
8.10.30 71H ENG1 MAPPING LSB ..............................................................................................................60
8.10.31 ENG2 MAPPING MSB .....................................................................................................................61
8.10.32 ENG2 MAPPING LSB ......................................................................................................................61
8.10.33 ENG3 MAPPING MSB .....................................................................................................................61
8.10.34 ENG3 MAPPING LSB ....................................................................................................................62
8.10.35 GAIN CHANGE CTRL ......................................................................................................................63
8.11 Instruction Set
............................................................................................................................................64
RAMP (Numerical Operands) ............................................................................................................67
RAMP (Variables) ..............................................................................................................................68
SET PWM (Numerical Operands) ......................................................................................................69
SET PWM (Variables) ........................................................................................................................70
WAIT ..................................................................................................................................................70
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8.12.1
8.12.2
8.12.3
8.12.4
8.12.5
..............................................................................................................................67
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8.12 LED Driver Instructions
..........................................................................................................................71
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8.13 LED Mapping Instructions
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8.13.1 MUX_LD_START ...............................................................................................................................71
8.13.2 MUX_LD_END ...................................................................................................................................71
8.13.3 MUX_MAP_START ............................................................................................................................72
8.13.4 MUX_SEL ..........................................................................................................................................72
8.13.5 MUX_CLR ..........................................................................................................................................72
8.13.6 MUX_MAP_NEXT ..............................................................................................................................73
8.13.7 MUX_MAP_PREV ..............................................................................................................................73
8.13.8 MUX_LD_NEXT .................................................................................................................................74
8.13.9 MUX_LD_PREV .................................................................................................................................74
8.13.10 MUX_MAP_ADDR ...........................................................................................................................74
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AS3661
Datasheet
8.13.11 MUX_LD_ADDR ..............................................................................................................................74
8.14 Branch Instructions
....................................................................................................................................75
RST ....................................................................................................................................................75
BRANCH (Numerical) ........................................................................................................................75
BRANCH (Variables) ..........................................................................................................................76
INT .....................................................................................................................................................76
END ....................................................................................................................................................76
TRIGGER ...........................................................................................................................................76
JNE/JL/JGE/JE ..................................................................................................................................77
8.15 Arithmetic Instructions
...............................................................................................................................78
LD .......................................................................................................................................................78
ADD (Numerical Operands) ...............................................................................................................78
ADD (Variables) .................................................................................................................................78
SUB (Numerical) ................................................................................................................................79
SUB (Variables) .................................................................................................................................79
........................................................................................................................... 81
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9 Typical Application
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8.15.1
8.15.2
8.15.3
8.15.4
8.15.5
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8.14.1
8.14.2
8.14.3
8.14.4
8.14.5
8.14.6
8.14.7
9.1 Recommended External Components
10 Package Drawings and Markings
.................................................................................................. 83
...................................................................................................................... 84
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11 Ordering Information
.........................................................................................................82
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AS3661
Datasheet - P i n o u t
4 Pinout
4.1 Pin Assignment
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Figure 2. Pin Assignments (Top View)
4.2 Pin Description
Table 1. Pin Description for AS3661
Pin Name
A1
LED1
LED1 Output. Current source from VCP.
A2
LED2
LED2 Output. Current source from VCP.
A3
VCP
Charge Pump output. make a short connection to capacitor CVCPOUT.
A4
C2-
Charge Pump flying capacitor 2. make a short connection to capacitor CFLY2.
A5
C2+
Charge Pump flying capacitor 2. make a short connection to capacitor CFLY2.
B1
LED3
LED3 Output. Current source from VCP.
B2
LED4
LED4 Output. Current source from VCP.
B3
ASEL1
B4
C1-
Charge Pump flying capacitor 1. make a short connection to capacitor CFLY1.
B5
C1+
Charge Pump flying capacitor 1. make a short connection to capacitor CFLY1.
LED5
LED5 Output. Current source from VCP.
LED6
LED6 Output. Current source from VCP.
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C2
Digital input - I²C address select
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C1
Description
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Pin Number
Digital input - I²C address select
ASEL0
C4
EN
C5
VBAT
Positive Power Supply Input
D1
LED7
LED7 Output. Current source from VBAT.
D2
LED8
LED8 Output. Current source from VBAT.
D3
INT
D4
CLK32K
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C3
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Enable. Active high digital input.
Interrupt Output. Open drain digital output for microcontroller unit, leave
unconnected if not used.
Digital Clock Input. Connect a 32kHz signal; if this signal is not available, connect
this pin to GND.
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AS3661
Datasheet - P i n o u t
Table 1. Pin Description for AS3661
Description
D5
GND
Ground
E1
LED9
LED9 Output. Current source from VBAT.
E2
GPO
General Purpose Output. Leave unconnected if not used.
E3
TRIG
Trigger Input. Open drain, connect to ground if not used.
E4
SDA
Serial-Data I/O. Open drain digital I/O I²C data pin.
E5
SCL
Serial-Clock Input
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Pin Name
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Pin Number
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AS3661
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in Table 3. Electrical
Characteristics on page 8 is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 2. Absolute Maximum Ratings
Max
Units
VBAT, VCP, C1+, C1-, C2+, C2- to GND
-0.3
+7.0
V
VCP to VBAT
-0.3
LED1, LED2....LED9 to GND
-0.3
+7.0
V
V
SDA, SCL, EN, CLK32K, TRIG, INT, GPO,
ASEL0, ASEL1 to GND
-0.3
+7.0
V
Electrostatic Discharge
ESD HBM (LED1 to LED2)
kV
Diode between VCP and VBAT
JEDEC JESD22-A114
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8
Comments
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Parameter
ESD HBM (all other pins)
2.5
kV
ESD MM
250
V
JEDEC JESD22-A115
ESD CDM
1
kV
JEDEC JESD22-C101
Internally limited (overtemperature
1
protection)
Temperature Ranges and Storage Conditions
Continous Power Dissipation
Junction Temperature (TJMAX)
+125
ºC
+125
ºC
Body Temperature during Soldering
+260
ºC
Junction to Ambient Thermal Resistance
2
(θJA)
87
°C/W
Storage Temperature Range
-55
Moisture Sensitive Level
IPC/JEDEC J-STD-020
Represents a max. floor life time of
unlimited
1
Recommended Operating Conditions
Recommended charge pump load current
0
100
mA
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1. Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages
at TJ = 150°C (typ.) and disengages at T J = 130°C (typ.).
2. Junction to ambient thermal resistance is highly application and board-layout dependent. In applications where
high maximum power dissipation exists, special care must be paid to thermal dissipation issues in board
design.
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AS3661
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
VBAT = 3.6V, VEN = 1.65V, CBAT = CVCPOUT = 1.0µF, CFLY1-2 = 0.47µF, TAMB = -30ºC to +85ºC, typical values @ TAMB =
1
+25ºC (unless otherwise specified) .
Table 3. Electrical Characteristics
Parameter
Condition
Min
Typ
Supply Voltage
2.7
Standby supply
current
IVBAT
EN = 0V or CHIP_EN=0 (bit), external 32 kHz
clock running or not running
1.4
External 32 kHz clock running, charge pump
and current source outputs disabled
0.16
Normal Mode supply
current
Unit
5.5
V
4
µA
0.22
mA
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VBAT
Max
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Symbol
General Operating Conditions
Charge pump in 1x mode, no load, current
source outputs disabled
0.16
Charge pump in 1.5x mode, no load, current
source outputs disabled
0.22
mA
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1.4
mA
Power Save Mode
supply current
External 32 kHz clock running
3.1
5
µA
Internal oscillator running
0.16
0.23
mA
fOSC
Internal Oscillator
Frequency Accuracy
TAMB = +25ºC
TAMB
Operating
1
Temperature
Charge Pump
ROUT
Charge Pump Output
Resistance
Switching Frequency
IGND
Ground current
tON
VCP Turn-On Time
ILOAD
Charge Pump load
current
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IMAX
Maximum Source
Current
IOUT
Output Current
Accuracy
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-7
+7
3
IMATCH
Matching
fLED
LED Switching
Frequency
VSAT
Saturation Voltage
25
Gain = 1.5 and VBAT = 2.9V
6
Gain = 1 and VBAT = 2.9V
1
Gain = 1.5 and VBAT = 3.6V
1.4
Gain = 1 and VBAT = 3.6V
1
1.2
ca
2
Leakage Current
(LED1 to LED9)
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ILEAK
+4
-30
fSW
LED Driver
-4
1.25
85
1.3
°C
Ω
MHz
Gain = 1.5
1.2
mA
Gain = 1
1
µA
VBAT = 3.6V, IOUT = 60 mA
100
µs
Recommended charge pump load current
0
PWM = 0%
0.1
Outputs LED1 to LED9
25.5
Output Current set to 17.5
mA
TAMB = +25ºC
Output Current set to 17.5 mA
100
mA
1
µA
mA
-2.5%
+2.5%
-5
+5
1
2.5
312
4
%
Output Current set to 17.5 mA
45
%
%
Hz
100
mV
LED Test
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Revision 1.3
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AS3661
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 3. Electrical Characteristics (Continued)
Parameter
LSB
Least Significant Bit
EABS
Total Unadjusted
5
Error
tCONV
Conversion Time
VIN_TEST
DC Voltage Range
Condition
Min
Typ
Max
30
VIN_TEST = 0V to VBAT
<±3
mV
±4
Logic Interface
Logic Input EN
Input Low Level
Input High Level
1.2
IIN
Input Current
-1.0
tDELAY
Input Delay
5
V
0.5
V
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VIL
LSB
ms
2.7
0
VIH
Unit
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Symbol
6
1.0
2
µs
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Logic Input SCL, SDA, TRIG, CLK32K, ASEL0, ASEL1
µA
0.2x
VEN
VIL
Input Low Level
VIH
Input High Level
0.8x
VEN
IIN
Input Current
-1.0
V
V
1.0
µA
0.5
V
1.0
µA
0.5
V
Logic Output SDA, TRIG, INT
VOL
Output Low Level
IOUT = 3 mA (pull-up current)
IL
Output Leakage
Current
VCP = 2.8V
Logic Output GPO
VOL
Output Low Level
IOUT = 3 mA
VOH
Output High Level
IOUT = -2 mA
IL
Output Leakage
Current
VCP = 2.8V
Logic Input CLK32K
0.3
0.3
VBAT - VBAT 0.3
0.5
1.0
µA
Clock Frequency
fCLKH
High Time
6
µs
fCLKL
Low Time
6
µs
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kHz
Clock Rise Time
10 to 90%
2
µs
Clock Fall Time
90 to 10%
2
µs
ch
tF
ca
fCLK
tR
32.7
V
Te
1. In applications where high power dissipation and/or poor package thermal resistance is present, the maximum
ambient temperature may have to be derated. Maximum ambient temperature (TAmb-MAX) is dependent on the
maximum operating junction temperature (TJ-MAX =125°C), the maximum power dissipation of the devi ce in the
application (PD-MAX) and the junction to ambient thermal resistance of the part/package in the application (θJA) as
given by the following equation: TAmb-MAX = TJ-MAX - (θJA * PD-MAX ).
2. Turn-on time is measured from the moment the charge pump is activated until the VCP crosses 90% of its target
value
1. Low-ESR Surface-Mount Ceramic Capacitors 8MLCCs) used in setting electrical characteristics.
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AS3661
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
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3. Output current accuracy is the difference between actual value of the output current and programmed value of
this current. IMATCH is determined as follows:
For the constant current D1 to D9, the following are determined: The maximum current (max) and the minimum
current (min), then the IMATCH is calculated with: IMATCH = 100*(((max-min)/2)+((max+min)/2))/((max+min)/2)100
4. Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured
at VCP - 1V.
5. Total unadjusted error includes offset, full-scale and linearity errors.
6. The I2C host should allow at least 500µs before sending data the AS3661after the rising edge of the enable
line.
2
SDA
tBUF
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Figure 3. I C mode Timing Diagram
tLOW
tR
SCL
tHD:STA
tF
tHD:STA
tSU:STO
tSU:STA
tHD:DAT
STOP START
tSU:DAT
REPEATED
START
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.
tHIGH
2 1
Table 4. Electrical Characteristics I C
Parameter
Condition
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Symbol
2
Min
Typ
Max
Unit
400
kHz
I C mode timings - see Figure 3 on page 10
SCL Clock Frequency
0
ch
fSCLK
Bus Free Time
Between a STOP and
START Condition
1.3
µs
tHD:STA
Hold Time (Repeated)
2
START Condition
0.6
µs
tLOW
LOW Period of SCL
Clock
1.3
µs
tHIGH
HIGH Period of SCL
Clock
0.6
µs
Te
tBUF
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AS3661
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
2 1
Table 4. Electrical Characteristics (Continued)I C
Parameter
Condition
tSU:STA
Setup Time for a
Repeated START
Condition
0.6
µs
tHD:DAT
Data Hold Time
3
50
ns
tSU:DAT
Data Setup Time
tR
Rise Time of Both
SDA and SCL Signals
20 +
0.1CB
tF
Fall Time of Both SDA
and SCL Signals
15+
0.1CB
tSU:STO
Setup Time for STOP
Condition
0.6
CB
Capacitive Load for
Each Bus Line
CI/O
I/O Capacitance
(SDA, SCL)
4
Min
Unit
ns
300
ns
300
ns
10
µs
200
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Load of one Picofarad corresponds to one
nanosecond.
Max
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100
Typ
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Symbol
10
ns
pF
1. Specification is guaranteed by design and is not tested in production. VEN = 1.65V to VBAT.
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2. After this period the first clock pulse is generated.
3. A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the VIHMIN of the
SCL signal) to bridge the undefined region of the falling edge of SCL.
4. A fast-mode device can be used in a standard-mode system, but the requirement tSU:DAT = to 250ns must then
be met. This is automatically the case if the device does not stretch the LOW period of the SCL signal. If such a
device does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line tR max +
tSU:DAT = 1000 + 250 = 1250ns before the SCL line is released.
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Revision 1.3
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AS3661
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
VBAT = 3.6V, VEN = 1.65V, CBAT = CVCPOUT = 1.0µF, CFLY1-2 = 0.47µF, TAMB = +25ºC, unless otherwise specified
Figure 4. Charge Pump 1.5 x Efficiency vs. Load
Figure 5. Output Voltage vs. Load Current (1.5 x CP)
100
90
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4,4
80
4,2
Output Voltage
60
50
40
VBAT = 2.7V
30
VBAT = 3.0V
20
3,8
3,6
VBAT = 2.7V
VBAT = 3.0V
VBAT = 3.3V
3,4
VBAT = 3.3V
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4
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Efficiency
70
VBAT = 3.6V
0
VBAT = 3.6V
3,2
0
15
30
45
60
75
90
0
15
30
45
60
75
90
105
120
Iload [mA]
Iload [mA]
Figure 6. Gain Change Hysteresis Loop (6x1mA load)
Figure 7. Effect of adap. hyst. on width of hyst. loop
0,6
4,5
6 x LED Multicomp OVS-0601
4,3
0,5
Hysteresis [V]
4,1
3,9
VCP [V]
6 x LED Multicomp OVS-0601
3,7
3,5
3,3
3,1
0,4
0,3
400mV Adaptive Hysterese
200mV Adaptive Hysterese
0,2
200mV Hysterese
400mV Hysterese
2,9
0,1
Vbat increasing
2,7
Vbat decreasing
2,5
2,8
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0
2,6
3
3,2
3,4
3,6
3,8
4
0
10
30
40
50
60
70
80
90
100
Figure 9. LED current Accuracy distribution @17.5mA
Total count: 610 parts
Total count: 610 parts
60
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Count
Count
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Figure 8. LED Current matching distribution @17.5mA
70
20
Iload [mA]
Vbat [V]
0
−1
0
0
1
−2
%
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0
2
%
Revision 1.3
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AS3661
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 10. Power Save Mode Supply Current vs.
VBAT, Charge Pump in 1x mode
Figure 11. Serial Bus Write and Charge Pump Startup, ILOAD = 60mA
200
2V/Div
int ernal CLK
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SCL
2V/Div
100
VCP
50
0
3,5
3,9
4,3
4,7
5,1
5,5
25µs/Div
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VBAT [V]
4.2V
VBAT
4V
3.8V
VCP
VCP
4.65V
3.6V
2.8V
500mV/Div
VBAT
3.6V
2.8V
Figure 13. Line Trans. and Charge Pump autom. Gain
Change 1 to 1.5, [email protected] 100% PWM
500mV/Div
Figure 12. Line Trans. and Charge Pump autom. Gain
Change 1.5 to 1, [email protected] 100% PWM
3.6V
2.5ms/Div
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2.5ms/Div
Figure 14. 100% PWM RGB LED Efficiency vs. VBAT
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Figure 15. 100% PWM WLED Efficiency vs. VBAT
95
6x15mA
9x10mA
90
85
Efficiency [%]
75
70
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Efficiency [%]
6x10mA
9x6.7mA
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80
500mV/Div
3,1
500mV/Div
2,7
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Ibat [µA]
150
2V/Div
SDA
ext ernal CLK
65
80
75
70
65
60
60
3 x LED Osram LRTB Y3SG
6 x LED Multicomp OVS-0601
55
55
2,7
3,3
3,9
4,5
5,1
VBAT [V]
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2,7
3,2
3,7
4,2
4,7
VBAT [V]
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS3661 is a fully integrated lighting management unit for producing lighting effects for mobile devices. The
AS3661 includes all necessary power management, high-side current sources, temperature compensation, two wire
control interface and programmable pattern generators. The overall maximum current for each driver is set by an 8-bit
register. The AS3661 controls LED luminance with a pulse width modulation (PWM) scheme with a resolution of 12
bits. The temperature compensation is also done by a PWM.
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8.1 Programming
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The AS3661 provides flexibility and programmability for dimming and sequencing control. Each LED can be controlled
directly and independently through the serial bus or LED drivers can be grouped together for pre-programmed flashing
patterns. The AS3661 has three independent program execution engines, so it is possible to form three independently
programmable LED banks. LED drivers can be grouped based on their function so that, for example, the first bank of
drivers can be assigned to the keypad illumination, the second bank to the “funlights” and the third group to the
indicator LED(s). Each bank can contain 1 to 9 LED driver outputs. Instructions for program execution engines are
stored in the program memory. The total amount of the program memory is 96 instructions and the user can allocate
the memory as required by the engines.
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8.2 LED Error Detection
AS3661 has a built-in LED error detection. Error detection does not only detect open and short circuit, but provides an
opportunity to measure the VF’s of the LEDs. The test event is activated by a serial interface write and the result can be
read through the serial interface during the next cycle. This feature can also be addressed to measure the voltage on
VBAT, VCP and INT pins. Typical example usage includes monitoring battery voltage or using INT pin as a light sensor
interface.
8.3 Energy Efficiency
When charge pump automatic mode selection is enabled, the AS3661 monitors the voltage over the drivers of LED1 to
LED6 so that the device can select the best charge pump gain and maintain good efficiency over the whole operating
voltage range. The red LED element of an RGB LED typically has a forward voltage of about 2V. For that reason, the
outputs LED7, LED8 and LED9 are internally powered by VBAT, since battery voltage is high enough to drive red LEDs
over the whole operating voltage range. This allows to drive three RGB LEDs with good efficiency because the red
LEDs doesn't load the charge pump. AS3661 is able to automatically enter power-save mode, when LED outputs are
not active and thus lowering idle current consumption down to 10 µA (typ.). During the “downtime” of the PWM cycle
(constant current output status is low) additional power savings can be achieved when the PWM power save feature is
enabled.
8.4 Temperature Compensation
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The luminance of an LED is typically a function of its temperature even though the current flowing through the LED
remains constant. Since luminance is temperature dependent, many LED applications require some form of
temperature compensation to decrease luminance and color purity variations due to temperature changes. The
AS3661 has a build in temperature sensing element and PWM duty cycle of the LED drivers changes linearly in
relationship to changes in temperature. User can select the slope of the graph (31 slopes) based on the LED
characteristics. This compensation can be done either constantly, or only right after when the device wakes up from
power save mode, to avoid error due to self-heating of the device. Linear compensation is considered to be practical
and accurate enough for most LED applications. Compensation is effective over the temperature range from -40°C to
+90°C.
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 16.
Temperature Compensation Principle
100
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50
M ax. Slope
Value
No
compensation
M in. Slope Value
25
0
-50
-25
0
25
50
75
100
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Temperature [°C]
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Efficiency [%]
75
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Figure 17. AS3661 - Block Diagram
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.5 Modes of Operation
The following are the different modes of operation of AS3661
8.5.1 RESET
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In the RESET mode all the internal registers are reset to the default values. Reset is entered always if Reset Register
(3DH) is written FFH or internal Power On Reset is active. Power On Reset (POR) will activate during the chip startup
or when the supply voltage VBAT fall below 1.5V (typ.). Once VBAT rises above 1.5V (typ.) POR will be inactivate and
the chip will continue to the STANDBY mode. CHIP_EN control bit is low after POR by default.
8.5.2 STANDBY
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The STANDBY mode is entered if the register bit CHIP_EN or EN pin is logic low and Reset is not active. This is the
low power consumption mode, when all circuit functions are disabled. Registers can be written in this mode if EN pin is
logic high so that the control bits will be effective right after the start up.
8.5.3 STARTUP
8.5.4 NORMAL
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When CHIP_EN bit is written high and the EN pin is high, the INTERNAL STARTUP SEQUENCE powers up all the
needed internal blocks (VREF, Bias, Oscillator etc.). Startup delay is 500 µs. If the chip temperature rises too high, the
Thermal Shutdown (TSD) disables the chip operation and chip waits in STARTUP mode until no thermal shutdown
event is present.
During NORMAL mode the user controls the chip using the Control Registers.
8.5.5 POWER SAVE
In POWER SAVE mode analog blocks are disabled to minimize power consumption. (see Automatic Power Save
Mode on page 19)
Figure 18. Mode Select
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Revision 1.3
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.6 Charge Pump Operational Description
8.6.1 Overview
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The AS3661 includes a pre-regulated switched-capacitor charge pump with a programmable voltage multiplication of 1
and 1.5x. In 1.5x mode by combining the principles of a switched-capacitor charge pump and a linear regulator, it
generates a regulated 4.5V output from Li-Ion input voltage range. A two-phase non-overlapping clock generated
internally controls the operation of the charge pump. During the charge phase, both flying capacitors (CFLY1 and CFLY2)
are charged from input voltage. In the pump phase that follows, the flying capacitors are discharged to output. A
traditional switched capacitor charge pump operating in this manner will use switches with very low on-resistance,
ideally 0Ω, to generate an output voltage that is 1.5x the input voltage. The AS3661 regulates the output voltage by
controlling the resistance of the input-connected pass-transistor switches in the charge pump.
CFLY1
VBAT
CFLY2
C1-
C1+
C2-
C2+
Low Noise
Charge Pump
1:1, 1:1.5 Modes
VBAT
VCP
CVCPOUT
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CBAT
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Figure 19. Charge Pump
cp_max_5V4
Voltage limit
4.5V
5.4V
LED1
up
LED2
V
...
Mode
Switching
down
V
LED9
8.6.2 Output Resistance
At lower input voltages, the charge pump output voltage may degrade due to effective output resistance (ROUT) of the
charge pump. The expected voltage drop can be calculated by using a simple model for the charge pump illustrated in
Figure 20 below.
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Figure 20. Charge Pump Output Resistance
Vin
V
1.5x
1.5x V Rout
Vcp
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REG
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The model shows a linear pre-regulation block (REG), a voltage multiplier (1.5x), and an output resistance (ROUT). The
output resistance models the output voltage drop that is inherent to switched capacitor converters. The output
resistance is 3.5Ω (typ.), and it is a function of switching frequency, input voltage, flying capacitors’ capacitance value,
internal resistances of the switches and ESR of the flying capacitors. When the output voltage is in regulation, the
regulator in the model controls the voltage V to keep the output voltage equal to 4.5V (typ.). With increased output
current, the voltage drop across ROUT increases. To prevent drop in output voltage, the voltage drop across the
regulator is reduced, V increases, and VCP remains at 4.5V. When the output current increases to the point that there
is zero voltage drop across the regulator, V equals the input voltage, and the output voltage is “on the edge” of
regulation. Additional output current causes the output voltage to fall out of regulation, so that the operation is similar to
a basic open-loop 1.5x charge pump. In this mode, output current results in output voltage drop proportional to the
output resistance of the charge pump. The out-of-regulation output voltage can be approximated by:
VCP = 1.5 x VIN – IOUT x ROUT.
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.6.3 Controlling the Charge Pump
The charge pump is controlled with two CP_MODE bits in MISC register (address 36H). When both of the bits are low,
the charge pump is disabled and the output voltage is pulled down with an internal 300 kΩ (typ.) resistor. The charge
pump can be forced to bypass mode, so that the battery voltage is connected directly to the current sources. In 1.5x
mode the output voltage is boosted to 4.5V. In automatic mode the charge pump operation mode is determined by
saturation of constant current drivers, like described in chapter LED Forward Voltage Monitoring.
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8.6.4 LED Forward Voltage Monitoring
When the charge pump automatic mode selection is enabled, the voltages over the LED drivers LED1 to LED6 are
monitored.
Note: Power input for current source outputs LED7, LED8 and LED9 are internally connected to the VBAT pin.
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If the LED1 to LED6 drivers do not have enough headroom, the charge pump gain is set to 1.5x. Driver saturation
monitor does not have a fixed voltage limit, since saturation voltage is a function of temperature and current. The
charge pump gain is set to 1x, when the battery voltage is high enough to supply all LEDs. In automatic gain change
mode, the charge pump is switched to bypass mode (1x), when LEDs are inactive for over 50 ms.
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8.6.5 Gain Change Hysteresis
The charge pump gain control utilizes digital filtering to prevent supply voltage disturbances (for example, the transient
voltage on the power supply during the GSM burst) from triggering unnecessary gain changes. Hysteresis is provided
to prevent periodic gain changes, which would occur due to LED driver and charge pump voltage drop in 1x mode. The
hysteresis of the gain change is user configurable, default setting is factory programmable. Flexible configuration
ensures, that the hysteresis can be minimized or set to desired level in each application. LED forward voltage
monitoring and gain control block diagram is shown in Figure 21.
Figure 21. Forward Voltage Monitoring and Gain Control Block
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Revision 1.3
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.6.6 Automatic Power Save Mode
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Automatic power save mode is enabled when POWERSAVE_EN bit in register address 36H is ‘1’. Almost all analog
blocks are powered down in power save, if an external clock signal is used. Only the charge pump protection circuits
remain active. However, if the internal clock has been selected, only charge pump and LED drivers are disabled during
the power save; the digital part of the LED controller needs stay active. In both cases the charge pump enters to the
weak 1x mode. In this mode the charge pump utilizes a passive current limited keep-alive switch, which keeps the
output voltage at the battery level. During the program execution AS3661 can enter power save if there is no PWM
activity in any of the LED driver outputs. To prevent short power save sequences during program execution, AS3661
has an instruction look-ahead filter. During program execution engine 1, engine 2 and engine 3 instructions are
constantly analyzed, and if there is time intervals of more than 50ms in length with no PWM activity on LED driver
outputs, the device will enter power save. In power save mode program execution continues uninterruptedly. When an
instruction that requires PWM activity is executed, a fast internal startup sequence will be started automatically.
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8.6.7 PWM Power Save Mode
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PWM cycle power save mode is enabled when register 36 bit [2] PWM_PS_EN is set to '1'. In PWM power save mode
analog blocks are powered down during the "down time" of the PWM cycle. Blocks that are powered down depends
whether external or internal clock is used. While the Automatic Power Save Mode (see above) saves energy when
there is no PWM activity at all, the PWM Power Save mode saves energy during PWM cycles. Like the Automatic
Power Save Mode, PWM Power Save Mode works also during program execution.
5mA/Div
1ms/Div
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INPUT CURRENT ~3.5µA
DURING PWM POWESAVE
2mA/Div
AS3661 Input Current
LED Current
Figure 22. PWM Powersave Principle with external clock (VDD =3.6V, 50% PWM, ILED9=5mA)
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.7 LED Driver Operational Description
AS3661 LED drivers are constant current sources. The output current can be programmed by control registers up to
25.5 mA. The overall maximum current is set by 8-bit output current control registers with 100 µA step size. Each of the
9 LED drivers has a separate output current control register. The LED luminance pattern (dimming) is controlled with
PWM (pulse width modulation) technique, which has internal resolution of 12 bits (8-bit control can be seen by user).
PWM frequency is 312 Hz (see Figure 23 on page 20).
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Figure 23. LED Pattern and Current Control Principle
LED dimming is controlled according to a logarithmic or linear scale(see Figure 24). Logarithmic or linear scheme can
be set for both the program execution engine control and direct PWM control.
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
linear PWM
logarithmic PWM
0
64
128
192
256
Dimming Control [DEC]
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PWM Output [%]
Figure 24. Logarithmic vs. Linear Dimming
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Note: If the temperature compensation is active, the maximum PWM duty cycle is limited to 50% at +25°C. This is
required to allow enough headroom for temperature compensation over the whole temperature range -40 °C to
90°C.
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.7.1 Powering LEDs
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Although the AS3661 is very suitable for white LED and general purpose applications, it is particularly well suited to
use with RGB LEDs. The AS3661 architecture is optimized for use with three RGB LEDs. Typically, the red LEDs have
forward voltages below 2V and thus red LEDs can be powered directly from VBAT. In AS3661 the LED7, LED8 and
LED9 drivers are directly powered from the battery voltage (VBAT), not from the charge pump output. The LED1 to
LED6 drivers are internally connected to the charge pump output and these outputs can be used for driving green and
blue (VF = 2.7V to 3.7V) or white LEDs. Of course, LED7, LED8 and LED9 outputs can be used for green, blue or white
LEDs if the VBAT voltage is high enough. An RGB LED configuration example is given in the Typical Applications
section.
8.7.2 Controlling the High-side LED Drivers
Direct PWM Control
All AS3661 LED drivers, LED1 to LED9, can be controlled independently through the two-wire serial I²C compatible interface. For each high-side driver there is a PWM control register. Direct PWM control is active by default.
Controlling by Program Execution Engines
Engine control is used when the user wants to create programmed sequences. The program execution engine has
higher priority than direct control registers. Therefore if the user has set to PWM register a certain value it will be
automatically overridden when the program execution engine controls the driver. LED control and program execution engine operation is described in the chapter Control Register Details.
Master Fader Control
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In addition to LED-by-LED PWM register control, the AS3661 is equipped with so called master fader control,
which allows the user to fade in or fade out multiple LEDs by writing to only one register. This is an useful function
to minimize serial bus traffic between the MCU and the AS3661. The AS3661 has three master fader registers, so
it is possible to form three master fader groups. Master fader control can be used with the engines as well.
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.8 I2C Compatible Control Interface
2
The AS3661 supports the I C bus protocol. A device that sends data onto the bus is defined as a transmitter and a
device receiving data as a receiver. The device that controls the message is called a master. The devices that are
controlled by the master are referred to as slaves. A master device that generates the serial clock (SCL), controls the
bus access, and generates the START and STOP conditions must control the bus. The AS3661 operates as a slave on
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the I C bus. Within the bus specifications a standard mode (100kHz maximum clock rate) and a fast mode (400kHz
maximum clock rate) are defined. The AS3661 works in both modes. Connections to the bus are made through the
open-drain I/O lines SDA and SCLTable 5
8.8.1 I2C Address selection
(Hex)
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The slave address can be selected depending on the connection of the two address selection pins ASEL0 and ASEL1.
The selected address for reading and writing depending on the state of ASEL0 and ASEL1 can be found inTable 5
below.
GND
32
64/65
VEN
33
66/67
GND
34
68/69
VEN
35
6A/6B
Table 5. Chip Address Configuration
Address
ASEL0
GND
GND
VEN
VEN
8 bit Hex Address
R/W
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ASEL1
The following bus protocol has been defined (Figure 25):
Data transfer may be initiated only when the bus is not busy.
During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data line
while the clock line is HIGH are interpreted as control signals.
Accordingly, the following bus conditions have been defined:
8.8.2 Bus Not Busy
Both data and clock lines remain HIGH.
8.8.3 Start Data Transfer
A change in the state of the data line, from HIGH to LOW, while the clock is HIGH, defines a START condition.
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8.8.4 Stop Data Transfer
A change in the state of the data line, from LOW to HIGH, while the clock line is HIGH, defines the STOP condition.
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8.8.5 Data Valid
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The state of the data line represents valid data when, after a START condition, the data line is stable for the duration of
the HIGH period of the clock signal. The data on the line must be changed during the LOW period of the clock signal.
There is one clock pulse per bit of data.
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Each data transfer is initiated with a START condition and terminated with a STOP condition. The number of data bytes
transferred between START and STOP conditions are not limited, and are determined by the master device. The
information is transferred byte-wise and each receiver acknowledges with a ninth bit.
8.8.6 Acknowledge
Each receiving device, when addressed, is obliged to generate an acknowledge after the reception of each byte. The
master device must generate an extra clock pulse that is associated with this acknowledge bit.
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
A device that acknowledges must pull down the SDA line during the acknowledge clock pulse in such a way that the
SDA line is stable LOW during the HIGH period of the acknowledge-related clock pulse. Of course, setup and hold
times must be taken into account. A master must signal an end of data to the slave by not generating an acknowledge
bit on the last byte that has been clocked out of the slave. In this case, the slave must leave the data line HIGH to
enable the master to generate the STOP condition.
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Figure 25. Data Transfer on I C Serial Bus
SDA
MSB
SLAVE
ADDRESS
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R/W
DIRECTION
BIT
ACKNOWLEDGEMENT
SIGNAL FROM
RECEIVER
SCL
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ACKNOWLEDGEMENT
SIGNAL FROM
RECEIVER
1
2
6
7
8
9
1
2
3-8
8
9
ACK
START
CONDITION
REPEATED IF
MORE BYTES ARE
TRANSFERRED
STOP CONDITION
OR REPEATED
START CONDITION
Depending upon the state of the R/W bit, two types of data transfer are possible:
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1. Data transfer from a master transmitter to a slave receiver. The first byte transmitted by the master is the
slave address. Next follows a number of data bytes. The slave returns an acknowledge bit after each received
byte. Data is transferred with the most significant bit (MSB) first.
2. Data transfer from a slave transmitter to a master receiver. The master transmits the first byte (the slave
address). The slave then returns an acknowledge bit, followed by the slave transmitting a number of data
bytes. The master returns an acknowledge bit after all received bytes other than the last byte. At the end of the
last received byte, a “not acknowledge” is returned. The master device generates all of the serial clock pulses
and the START and STOP conditions. A transfer is ended with a STOP condition or with a repeated START
condition. Since a repeated START condition is also the beginning of the next serial transfer, the bus is not
released. Data is transferred with the most significant bit (MSB) first.
The AS3661 can operate in the following two modes:
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1. Slave Receiver Mode (Write Mode): Serial data and clock are received through SDA and SCL. After each
byte is received an acknowledge bit is transmitted. START and STOP conditions are recognized as the beginning and end of a serial transfer. Address recognition is performed by hardware after reception of the slave
address and direction bit (see Figure 26). The slave address byte is the first byte received after the master
generates the START condition. The slave address byte contains the 7-bit AS3661 address, which is
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0110010 , followed by the direction bit (R/W), which, for a write, is 0. After receiving and decoding the slave
address byte the device outputs an acknowledge on the SDA line. After the AS3661 acknowledges the slave
address + write bit, the master transmits a register address to the AS3661. This sets the register pointer on the
AS3661. The master may then transmit zero or more bytes of data (if more than one data byte is written see
also Blockwrite/read boundaries on page 24), with the AS3661 acknowledging each byte received. The
2. ’XXX’ depends on the external connection of ASEL0 and ASEL1; see Chip Address Configuration on page
22
3. The address for writing to the AS3661 is 8Xh = 01100100b - see Table 5
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
address pointer will increment after each data byte is transferred. The master generates a STOP condition to
terminate the data write.
2. Slave Transmitter Mode (Read Mode): The first byte is received and handled as in the slave receiver mode.
However, in this mode, the direction bit indicates that the transfer direction is reversed. Serial data is transmitted on SDA by the AS3661 while the serial clock is input on SCL. START and STOP conditions are recognized
as the beginning and end of a serial transfer (Figure 26 and Figure 27). The slave address byte is the first byte
received after the master generates a START condition. The slave address byte contains the 7-bit AS3661
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address, which is 0110010, followed by the direction bit (R/W), which, for a read, is 1. After receiving and
decoding the slave address byte the device outputs an acknowledge on the SDA line. The AS3661 then
begins to transmit data starting with the register address pointed to by the register pointer (if more than one
data byte is read see also Blockwrite/read boundaries on page 24). If the register pointer is not written to
before the initiation of a read mode the first address that is read is the last one stored in the register pointer.
The AS3661 must receive a “not acknowledge” to end a read.
<Slave Address>
S
0110010
<RW>
am
lc s
on A
te G
nt
st
il
Figure 26. Data Write - Slave Receiver Mode
0
<Data(n)>
XXXXXXXX
XXXXXXXX
A
A
S - Start
A - Acknowledge (ACK)
P - Stop
<Data(n+X)>
<Data(n+1)>
<Word Address (n)>
A
XXXXXXXX
A
XXXXXXXX
A
P
Data Transferred
(X + 1 Bytes + Acknowledge)
0110010
0
A
XXXXXXXX
ca
S
<Word Address (n)>
A
XXXXXXXX
ni
XXXXXXXX
0110010
A
XXXXXXXX
1
A
<Data(n+X)>
A
XXXXXXXX
NA
P
Data Transferred
(X + 1 Bytes + Acknowledge)
Note: Last data byte is followed by a NACK
Te
ch
S - Start
Sr - Repeated Start
A - Acknowledge (ACK)
P - Stop
NA -Not Acknowledge (NACK)
Sr
<Data(n+2)>
<Data(n+1)>
<Data(n)>
A
<Slave Address>
<RW>
<RW>
Figure 27. Data Read (Write Pointer, Then Read) - Slave Receive and Transmit
4. The address for read mode from the AS3661 is 8Xh+1 = 01100101b - see Table 5
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Revision 1.3
24 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.8.7 Program Downloading
First the register page_select is set to the program page, which should be accessed. Then the program page (part of or
full page) can be downloaded to the registers Cmd_0_MSB, Cmd_0_LSB, Cmd_1_MSB, Cmd_1_LSB...Cmd_F_MSB,
2
Cmd_F_LSB (I C registers area 50h to 6Fh).
Table 6. Page_Select Register
Bit
Page_Select Register
Bit Name
Default Access
Description
al
id
Addr: 4Fh
Selects program page for download
R/W
001
page 1 - Addr 10h-1Fh
010
page 2 - Addr 20h-2Fh
011
page 3 - Addr 30h-3Fh
100
page 4 - Addr 40h-4Fh
101
page 5 - Addr 50h-5Fh
110
don’t use
111
don’t use
am
lc s
on A
te G
nt
st
il
8.9 Register Set
000b
page 0 - Addr 00h-0Fh
lv
page_select
2:0
000
The AS3661 is controlled by a set of registers through the two wire serial interface port. Some register bits are
reserved for future use. Table below lists device registers, their addresses and their abbreviations. A more detailed
description is given in chapter Control Register Details.
Table 7. Description of Registers
Hex
Address
Register Name
Bit(s)
Type
Default Value
After Reset
Description
CHIP_EN
[6]
ENABLE / ENGINE
CNTRL1
02
OUTPUT DIRECT/
RATIOMETRIC
MSB
www.austriamicrosystems.com
1
AS3661 enabled
[3:2]
xxxx00xx
ENGINE2_EXEC
Engine 2 program execution control
[1:0]
xxxxxx00
ENGINE3_EXEC
Engine 3 program execution control
xx00xxxx
ENGINE1_MODE
ENGINE 1 mode control
xxxx00xx
ENGINE2_MODE
ENGINE 2 mode control
xxxxxx00
ENGINE3_MODE
ENGINE 3 mode control
xxxxxxx0
LED9_RATIO_EN
Enables ratiometric dimming for LED9 output
ni
ch
Te
ENGINE CNTRL2
AS3661 not enabled
ENGINE1_EXEC
Engine 1 program execution control
R/W
[5:4]
01
0
xx00xxxx
[5:4]
ca
00
x0xxxxxx
[3:2]
R/W
[1:0]
[0]
R/W
Revision 1.3
25 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 7. Description of Registers
04
[7]
0xxxxxxx
LED8_RATIO_EN
Enables ratiometric dimming for LED8 output
[6]
x0xxxxxx
LED7_RATIO_EN
Enables ratiometric dimming for LED7 output
[5]
xx0xxxxx
LED6_RATIO_EN
Enables ratiometric dimming for LED6 output
[4]
xxx0xxxx
LED5_RATIO_EN
Enables ratiometric dimming for LED5 output
[3]
xxxx0xxx
LED4_RATIO_EN
Enables ratiometric dimming for LED4 output
[2]
xxxxx0xx
LED3_RATIO_EN
Enables ratiometric dimming for LED3 output
[1]
xxxxxx0x
LED2_RATIO_EN
Enables ratiometric dimming for LED2 output
[0]
xxxxxxx0
LED1_RATIO_EN
Enables ratiometric dimming for LED1 output
xxxxxxx1
LED9_ON
ON/OFF Control for LED9 output
[7]
1xxxxxxx
LED8_ON
ON/OFF Control for LED8 output
[6]
x1xxxxxx
LED7_ON
ON/OFF Control for LED7 output
[5]
xx1xxxxx
LED6_ON
ON/OFF Control for LED6 output
[4]
xxx1xxxx
LED5_ON
ON/OFF Control for LED5 output
[3]
xxxx1xxx
LED4_ON
ON/OFF Control for LED4 output
[2]
xxxxx1xx
LED3_ON
ON/OFF Control for LED3 output
[1]
xxxxxx1x
LED2_ON
ON/OFF Control for LED2 output
[0]
xxxxxxx1
LED1_ON
ON/OFF Control for LED1 output
[7:6]
00xxxxxx
MAPPING Mapping for LED1 output
[5]
xx0xxxxx
LOG_EN
Logarithmic dimming control for LED1
[4:0]
xxx00000
TEMP COMP
Temperature compensation control for LED1
output
[7:6]
00xxxxxx
MAPPING Mapping for LED2 output
xx0xxxxx
LOG_EN
Logarithmic dimming control for LED2 output
xxx00000
TEMP COMP
Temperature compensation control for LED2
output
OUTPUT ON/OFF
CONTROL MSB
OUTPUT ON / OFF
CONTROL LSB
[0]
R/W
R/W
ch
LED1 CONTROL
Te
06
07
lv
R/W
al
id
Description
Type
ca
05
OUTPUT DIRECT/
RATIOMETRIC LSB
Default Value
After Reset
Bit(s)
am
lc s
on A
te G
nt
st
il
03
Register Name
ni
Hex
Address
R/W
[5]
LED2 CONTROL
[4:0]
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R/W
Revision 1.3
26 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 7. Description of Registers
Default Value
After Reset
Description
00xxxxxx
MAPPING Mapping for LED3 output
xx0xxxxx
LOG_EN
Logarithmic dimming control for LED3 output
[4:0]
xxx00000
TEMP COMP
Temperature compensation control for LED3
output
[7:6]
00xxxxxx
MAPPING Mapping for LED4 output
xx0xxxxx
LOG_EN
Logarithmic dimming control for LED4 output
[4:0]
xxx00000
TEMP COMP
Temperature compensation control for LED4
output
[7:6]
00xxxxxx
MAPPING Mapping for LED5 output
xx0xxxxx
LOG_EN
Logarithmic dimming control for LED5 output
[4:0]
xxx00000
TEMP COMP
Temperature compensation control for LED5
output
[7:6]
00xxxxxx
MAPPING Mapping for LED6 output
xx0xxxxx
LOG_EN
Logarithmic dimming control for LED6 output
[4:0]
xxx00000
TEMP COMP
Temperature compensation control for LED6
output
[7:6]
00xxxxxx
MAPPING Mapping for LED7 output
xx0xxxxx
LOG_EN
Logarithmic dimming control for LED7 output
[4:0]
xxx00000
TEMP COMP
Temperature compensation control for LED7
output
[7:6]
00xxxxxx
MAPPING Mapping for LED8 output
xx0xxxxx
LOG_EN
Logarithmic dimming control for LED8 output
[4:0]
xxx00000
TEMP COMP
Temperature compensation control for LED8
output
[7:6]
00xxxxxx
MAPPING Mapping for LED9 output
xx0xxxxx
LOG_EN
Logarithmic dimming control for LED9 output
xxx00000
TEMP COMP
Temperature compensation control for LED9
output
Bit(s)
Type
[7:6]
[5]
08
LED3 CONTROL
[5]
LED4 CONTROL
[5]
0A
LED5 CONTROL
[5]
0B
LED6 CONTROL
[5]
LED7 CONTROL
[5]
R/W
R/W
LED8 CONTROL
R/W
ch
ni
0D
R/W
ca
0C
R/W
am
lc s
on A
te G
nt
st
il
09
R/W
[5]
LED9 CONTROL
Te
0E
al
id
Register Name
lv
Hex
Address
0F to 15
R/W
[4:0]
[7:0]
reserved
16
LED1 PWM
[7:0]
R/W
00000000
PWM duty cycle control for LED1
17
LED2 PWM
[7:0]
R/W
00000000
PWM duty cycle control for LED2
18
LED3 PWM
[7:0]
R/W
00000000
PWM duty cycle control for LED3
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Revision 1.3
27 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 7. Description of Registers
Register Name
Bit(s)
Type
Default Value
After Reset
Description
19
LED4 PWM
[7:0]
R/W
00000000
PWM duty cycle control for LED4
1A
LED5 PWM
[7:0]
R/W
00000000
PWM duty cycle control for LED5
1B
LED6 PWM
[7:0]
R/W
00000000
PWM duty cycle control for LED6
1C
LED7 PWM
[7:0]
R/W
00000000
PWM duty cycle control for LED7
al
id
Hex
Address
1D
LED8 PWM
[7:0]
R/W
00000000
PWM duty cycle control for LED8
1E
LED9 PWM
[7:0]
R/W
00000000
PWM duty cycle control for LED9
[7:0]
reserved
CURRENT
LED1 output current control register.
Default 17.5 mA (typ.)
lv
1F to 25
26
LED1 CURRENT
CONTROL
[7:0]
27
LED2 CURRENT
CONTROL
[7:0]
R/W
10101111
CURRENT
LED2 output current control register.
Default 17.5 mA (typ.)
28
LED3 CURRENT
CONTROL
[7:0]
R/W
10101111
CURRENT
LED3 output current control register.
Default 17.5 mA (typ.)
29
LED4 CURRENT
CONTROL
[7:0]
R/W
10101111
CURRENT
LED4 output current control register.
Default 17.5 mA (typ.)
2A
LED5 CURRENT
CONTROL
[7:0]
R/W
10101111
CURRENT
LED5 output current control register.
Default 17.5 mA (typ.)
2B
LED6 CURRENT
CONTROL
[7:0]
R/W
10101111
CURRENT
LED6 output current control register.
Default 17.5 mA (typ.)
2C
LED7 CURRENT
CONTROL
[7:0]
R/W
10101111
CURRENT
LED7 output current control register.
Default 17.5 mA (typ.)
0x2D
LED8 CURRENT
CONTROL
[7:0]
R/W
10101111
CURRENT
LED8 output current control register.
Default 17.5 mA (typ.)
0x2E
LED9 CURRENT
CONTROL
[7:0]
10101111
CURRENT
LED9 output current control register.
Default 17.5 mA (typ.)
ca
am
lc s
on A
te G
nt
st
il
10101111
ni
R/W
[7:0]
reserved
Te
ch
2F to 35
R/W
www.austriamicrosystems.com
Revision 1.3
28 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 7. Description of Registers
MISC
Description
[7]
0xxxxxxx
VARIABLE_D_SEL
Variable LED source selection
[6]
x1xxxxxx
EN_AUTO_INCR
Serial bus address auto increment enable
[5]
xx0xxxxx
POWERSAVE_EN
Powersave mode enable
xxx00xxx
CP_MODE
Charge pump gain selection
[2]
xxxxx0xx
PWM_PS_EN
PWM cycle powersave enable
[1]
xxxxxx0x
CLK_DET_EN
External clock detection
[4:3]
Type
R/W
xxxxxxx0
INT_CLK_EN
Clock source selection
am
lc s
on A
te G
nt
st
il
36
Default Value
After Reset
Bit(s)
al
id
Register Name
lv
Hex
Address
37
ENGINE1 PC
[6:0]
R/W
x0000000
PC Program counter for engine 1
38
ENGINE2 PC
[6:0]
R/W
x0000000
PC Program counter for engine 2
39
ENGINE3 PC
[6:0]
R/W
x0000000
PC Program counter for engine 3
[7]
0xxxxxxx
LEDTEST_MEAS_DONE
Indicates when the LED test measurement is
done.
[6]
x1xxxxxx
MASK_BUSY
Mask bit for interrupts generated by
STARTUP_BUSY or ENGINE_BUSY
[5]
xx0xxxxx
STARTUP_BUSY
This bit indicates that the start-up sequence
is running
xxx0xxxx
ENGINE_BUSY
This bit indicates that a program execution
engine is clearing internal registers
xxxx0xxx
EXT_CLK_USED
Indicates when external clock signal is in use
[2]
xxxxx0xx
ENG1_INT
Interrupt bit for program execution engine 1
ni
[0]
[1]
xxxxxx0x
ENG2_INT
Interrupt bit for program execution engine 2
[0]
xxxxxxx0
ENG3_INT
Interrupt bit for program execution engine 3
[2]
xxxxx0xx
INT_CONF
INT pin can be configured to function as a
GPO with this bit
xxxxxx0x
GPO pin control
xxxxxxx0
INT_GPO
GPO pin control for INT pin (when
INT_CONF is set "1")
00000000
VARIABLE
Global 8-bit variable
3A
STATUS /
INTERRUPT
R
[4]
Te
ch
ca
[3]
3B
3C
GPO
[1]
R/W
[0]
VARIABLE
www.austriamicrosystems.com
[7:0]
R/W
Revision 1.3
29 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 7. Description of Registers
Register Name
Bit(s)
Type
Default Value
After Reset
Description
3D
RESET
[7:0]
R/W
00000011
RESET
Writing 11111111 into this register resets the
AS3661
[7]
R
0xxxxxxx
TEMP_MEAS_BUSY
Indicates when temperature measurement is
active
xxxxx0xx
EN_TEMP_SENSOR
Reads the internal temperature sensor once
xxxxxx0x
CONTINUOUS_CONV
Continuous temperature measurement
selection
xxxxxxx0
SEL_EXT_TEMP
Internal/external temperature sensor
selection
3E
TEMP ADC
CONTROL
[1]
R/W
am
lc s
on A
te G
nt
st
il
[0]
lv
[2]
al
id
Hex
Address
3F
TEMPERATURE
READ
[7:0]
R
00011001
TEMPERATURE
Bits for temperature information
40
TEMPERATURE
WRITE
[7:0]
R/W
0000000
TEMPERATURE
Bits for temperature information
[7]
0xxxxxxx
EN_LED_TEST_ADC
[6]
x0xxxxxx
EN_LED_TEST_INT
xx0xxxxx
CONTINUOUS_CONV
Continuous LED test measurement selection
xxx00000
LED_TEST_CTRL
Control bits for LED test
N/A
LED_TEST_ADC
LED test result
LED TEST
CONTROL
41
[5]
R/W
[4:0]
42
LED TEST ADC
43
44
[7:0]
[7:0]
reserved
[7:0]
reserved
45
ENGINE1
VARIABLE A
[7:0]
46
ENGINE2
VARIABLE A
47
ENGINE3
VARIABLE A
48
MASTER FADER1
49
MASTER FADER2
00000000
VARIABLE FOR ENGINE1
[7:0]
R
00000000
VARIABLE FOR ENGINE2
[7:0]
R
00000000
VARIABLE FOR ENGINE3
[7:0]
R/W
00000000
MASTER FADER 1
[7:0]
R/W
00000000
MASTER FADER 2
[7:0]
R/W
00000000
MASTER FADER 3
ca
R
ni
ch
4A
R
MASTER FADER3
4B
[7:0]
reserved
ENG1 PROG
START ADDR
[6:0]
R/W
x0000000
Engine 1 program start address
4D
ENG2 PROG
START ADDR
[6:0]
R/W
x0001000
Engine 2 program start address
4E
ENG3 PROG
START ADDR
[6:0]
R/W
x0010000
Engine 3 program start address
4F
PROG MEM PAGE
SEL
[2:0]
R/W
xxxxx000
PAGE_SEL
Te
4C
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Revision 1.3
30 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 7. Description of Registers
Bit(s)
50
PROGRAM
MEMORY
00H/10H/20H/30H/
40H/50H
[15:8]
PROGRAM
MEMORY
01H/11H/21H/31H/
41H/51H
[15:8]
PROGRAM
MEMORY
02H/12H/22H/32H/
42H/52H
[15:8]
PROGRAM
MEMORY
03H/13H/23H/33H/
43H/53H
[15:8]
52
53
54
55
56
[7:0]
[7:0]
[7:0]
Description
00000000
R/W
00000000
00000000
R/W
00000000
00000000
R/W
00000000
00000000
R/W
00000000
CMD
Every Instruction is 16–bit width. The
AS3661 can store 96 instructions. Each
instruction consists of 16 bits. Because one
register has only 8 bits, one instruction
requires two register addresses. In order to
reduce program load time the AS3661
supports address auto-incrementation.
Register address is incremented after each 8
data bits. Thus the whole program memory
page can be written in one serial bus write
sequence.
Te
ch
ni
ca
57
[7:0]
Default Value
After Reset
am
lc s
on A
te G
nt
st
il
51
Type
al
id
Register Name
lv
Hex
Address
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Revision 1.3
31 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 7. Description of Registers
Bit(s)
58
PROGRAM
MEMORY
04H/14H/24H/34H/
44H/54H
[15:8]
PROGRAM
MEMORY
05H/15H/25H/35H/
45H/55H
[15:8]
PROGRAM
MEMORY
06H/16H/26H/36H/
46H/56H
[15:8]
PROGRAM
MEMORY
07H/17H/27H/37H/
47H/57H
[15:8]
PROGRAM
MEMORY
08H/18H/28H/38H/
48H/58H
[15:8]
PROGRAM
MEMORY
09H/19H/29H/39H/
49H/59H
[15:8]
PROGRAM
MEMORY
0AH/1AH/2AH/3AH/
4AH/5AH
[15:8]
PROGRAM
MEMORY
0BH/1BH/2BH/3BH/
4BH/5BH
[15:8]
PROGRAM
MEMORY
0CH/1CH/2CH/
3CH/4CH/5CH
[15:8]
PROGRAM
MEMORY
0DH/1DH/2DH/36D/
46D/5DH
[15:8]
PROGRAM
MEMORY
0EH/1EH/2EH/3EH/
4EH/5EH
[15:8]
PROGRAM
MEMORY
0FH/1FH/2FH/3FH/
4FH/5FH
[15:8]
5C
5D
5E
5F
60
61
62
63
64
65
66
67
68
69
6A
6B
6C
ch
6D
6E
Te
6F
70
[7:0]
[7:0]
[7:0]
Description
00000000
00000000
R/W
00000000
00000000
R/W
00000000
00000000
R/W
00000000
am
lc s
on A
te G
nt
st
il
5B
Default Value
After Reset
00000000
R/W
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
00000000
R/W
[7:0]
[7:0]
[7:0]
00000000
00000000
R/W
CMD
Every Instruction is 16–bit width. The
AS3661 can store 96 instructions. Each
instruction consists of 16 bits. Because one
register has only 8 bits, one instruction
requires two register addresses. In order to
reduce program load time the AS3661
supports address auto-incrementation.
Register address is incremented after each 8
data bits. Thus the whole program memory
page can be written in one serial bus write
sequence.
00000000
00000000
R/W
00000000
00000000
R/W
00000000
00000000
R/W
00000000
00000000
R/W
00000000
0xxxxxxx
GPO
Engine 1 mapping information, GPO pin
xxxxxxx0
D9
Engine 1 mapping information, D9 output
R
[0]
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00000000
00000000
R/W
[7]
ENG1 MAPPING
MSB
00000000
00000000
R/W
ca
5A
[7:0]
ni
59
Type
al
id
Register Name
lv
Hex
Address
Revision 1.3
32 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 7. Description of Registers
72
73
Description
[7]
0xxxxxxx
LED8
Engine 1 mapping information, LED8 output
[6]
x0xxxxxx
LED7
Engine 1 mapping information, LED7 output
[5]
xx0xxxxx
LED6
Engine 1 mapping information, LED6 output
[4]
xxx0xxxx
LED5
Engine 1 mapping information, LED5 output
[3]
xxxx0xxx
LED4
Engine 1 mapping information, LED4 output
[2]
xxxxx0xx
LED3
Engine 1 mapping information, LED3 output
ENG1 MAPPING
LSB
R
[1]
xxxxxx0x
LED2
Engine 1 mapping information, LED2 output
[0]
xxxxxxx0
LED1
Engine 1 mapping information, LED1 output
[7]
0xxxxxxx
GPO
Engine 2 mapping information, GPO pin
[0]
xxxxxxx0
LED9
Engine 2 mapping information, D9 output
[7]
0xxxxxxx
LED8
Engine 2 mapping information, LED8 output
[6]
x0xxxxxx
LED7
Engine 2 mapping information, LED7 output
[5]
xx0xxxxx
LED6
Engine 2 mapping information, LED6 output
[4]
xxx0xxxx
LED5
Engine 2 mapping information, LED5 output
xxxx0xxx
LED4
Engine 2 mapping information, LED4 output
[2]
xxxxx0xx
LED3
Engine 2 mapping information, LED3 output
[1]
xxxxxx0x
LED2
Engine 2 mapping information, LED2 output
[0]
xxxxxxx0
LED1
Engine 2 mapping information, LED1 output
[7]
0xxxxxxx
GPO
Engine 3 mapping information, GPO pin
xxxxxxx0
LED9
Engine 3 mapping information, LED9 output
ENG2 MAPPING
MSB
R
ENG2 MAPPING
LSB
R
ch
ca
[3]
ENG3 MAPPING
MSB
R
[0]
Te
74
lv
Type
al
id
Default Value
After Reset
Bit(s)
am
lc s
on A
te G
nt
st
il
71
Register Name
ni
Hex
Address
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Revision 1.3
33 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 7. Description of Registers
Description
[7]
0xxxxxxx
LED8
Engine 3 mapping information, LED8 output
[6]
x0xxxxxx
LED7
Engine 3 mapping information, LED7 output
[5]
xx0xxxxx
LED6
Engine 3 mapping information, LED6 output
[4]
xxx0xxxx
LED5
Engine 3 mapping information, LED5 output
[3]
xxxx0xxx
LED4
Engine 3 mapping information, LED4 output
[2]
xxxxx0xx
LED3
Engine 3 mapping information,LED3 output
Type
ENG3 MAPPING
LSB
R
al
id
Default Value
After Reset
Bit(s)
lv
75
Register Name
am
lc s
on A
te G
nt
st
il
Hex
Address
[1]
xxxxxx0x
LED2
Engine 3 mapping information, LED2 output
[0]
xxxxxxx0
LED1
Engine 3 mapping information, LED1 output
TRESHOLD
Threshold voltage (typ.)
[7:6]
76
GAIN CHANGE
CTRL
[5]
R/W
R/W
00xxxxxx
00
400mV
01
300mV
10
200mV
11
100mV
ADAPTIVE_TRESH_EN
Activates adaptive threshold.
xx0xxxxx
TIMER
R/W
ca
[4:3]
R/W
xxxxx0xx
5ms
01
10ms
10
50ms
11
Infinite
FORCE_1x
Activates 1.5x to 1x timer
Te
ch
ni
[2]
xxx00xxx
00
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10 Control Register Details
8.10.1 ENABLE/ ENGINE CONTROL1
This register controls the startup of the chip and the program execution modes for each program execution engine.
Table 8. ENABLE / ENGINE CNTR 1 Register
Register: 0x00
Bit Name
6
CHIP_EN
Default
R/W
0: Standby mode is entered. Still, control registers can be
written or read, excluding bits [5:0] in reg 00 (this
register), registers 16h to 1E (LED PWM registers) and 37h
to 39h (program counters).
1: internal startup sequence powers up all the needed internal
blocks and the device enters normal mode.
ENGINE1_EXEC
The engine 1 program execution control register bits define
how the program is executed. Program start address can be
programmed to program counter (PC) register 0x37.
am
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5:4
Bit Description
lv
0
Access
al
id
Bit
ENABLE / ENGINE CNTR1
00: Hold causes the execution engine to finish the current
instruction and then stop. Program counter (PC) can be
read or written only in this mode.
00
R/W
01: Execute the instruction at the location pointed by the PC,
increment the PC by one and then reset ENG1_EXEC bits to
00 (i.e. enter hold).
10: Start program execution from the location pointed by the
PC. This mode is also called “Free Run” mode.
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11: Execute the instruction pointed by the current PC value
and reset ENG1_EXEC to 00 (i.e. enter hold). The difference
between step and execute once is that execute once does not
increment the PC.
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 8. ENABLE / ENGINE CNTR 1 Register
Register: 0x00
ENABLE / ENGINE CNTR1
Bit
Bit Name
Default
3:2
ENGINE2_EXEC
Access
Bit Description
The engine 2 program execution control register bits define
how the program is executed. Program start address can be
programmed to program counter (PC) register 0x38.
R/W
01: Execute the instruction at the location pointed by the PC,
increment the PC by one and then reset ENG2_EXEC bits to
00 (i.e. enter hold).
lv
00
al
id
00: Hold causes the execution engine to finish the current
instruction and then stop. Program counter (PC) can be
read or written only in this mode.
10: Start program execution from the location pointed by the
PC. This mode is also called “Free Run” mode.
1:0
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11: Execute the instruction pointed by the current PC value
and reset ENG2_EXEC to 00 (i.e. enter hold). The difference
between step and execute once is that execute once does not
increment the PC.
ENGINE3_EXEC
The engine 3 program execution control register bits define
how the program is executed. Program start address can be
programmed to program counter (PC) register 0x39.
00: Hold causes the execution engine to finish the current
instruction and then stop. Program counter (PC) can be
read or written only in this mode.
00
R/W
01: Executes the instruction at the location pointed by the PC,
increment the PC by one and then reset ENG3_EXEC bits to
00 (i.e. enter hold).
10: Start program execution from the location pointed by the
PC. This mode is also called “Free Run” mode.
11: Execute the instruction pointed by the current PC value
and reset ENG3_EXEC to 00 (i.e. enter hold). The difference
between step and execute once is that execute once does not
increment the PC.
ca
8.10.2 ENGINE CNTRL2
The AS3661 supports up to four different operation modes which are defined in these registers.
Disabled: Engines can be configured to disabled mode each one separately.
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ni
Load program: Writing to program memory is allowed only when the engine is in load program operation mode and
engine busy bit (reg 3A) is not set. Serial bus master should check the busy bit before writing to program memory. All
the three engines are in hold while one or more engines are in load program mode. PWM values are frozen, also.
Program execution continues when all the engines are out of load program mode. Load program mode resets the
program counter of the respective engine. Load program mode can be entered from the disabled mode only. Entering
load program mode from the run program mode is not allowed.
Te
Run Program: Run program mode executes the instructions stored in the program memory. Execution register
(ENG1_EXEC etc.) bits define how the program is executed (hold, step, free run or execute once). Program start
address can be programmed to the Program Counter (PC) register. The Program Counter is reset to zero when the
PC’s upper limit value is reached.
Halt: Instruction execution aborts immediately and engine operation halts.
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 9. ENGINE CNTRL2 Register
Register: 0x01
ENGINE CNTRL2
Bit Name
Default
5:4
ENGINE1_MODE
Access
Bit Description
00: Disabled
00
R/W
01: Load program to SRAM, reset engine 1 PC
al
id
Bit
10: Run program as defined by ENGINE1_EXEC bits
11: Halts the engine
ENGINE2_MODE
00: Disabled
00
R/W
01: Load program to SRAM, reset engine 2 PC
10: Run program as defined by ENGINE2_EXEC bits
11: Halts the engine
ENGINE3_MODE
00: Disabled
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1:0
lv
3:2
00
R/W
01: Load program to SRAM, reset engine 3 PC
10: Run program as defined by ENGINE3_EXEC bits
11: Halts the engine
8.10.3 OUTPUT DIRECT/RATIOMETRIC MSB and LSB
A particular feature of the AS3661 is the ratiometric up/down dimming of the RGB-LEDs. In other words, the LED
driver PWM output will vary in a ratiometric manner. By a ratiometric approach the emitted color of an RGB–LED
remains the same regardless of the initial magnitudes of the R/G/B PWM outputs. For example, if the PWM output of
the red LED output is doubled, the output of green LED is doubled also.
Table 10. OUTPUT DIRECT / RATIOMETRIC MSB Register
Register: 0x02
Bit
Bit Name
0
LED9_RATIO_EN
OUTPUT DIRECT/RATIOMETRIC MSB
Default
Access
0
R/W
Bit Description
0: Disables ratiometric dimming for LED9 output.
1: enables ratiometric dimming for LED9 output.
Table 11. OUTPUT DIRECT / RATIOMETRIC LSB Register
ca
Register: 0x03
Bit Name
7
LED8_RATIO_EN
LED7_RATIO_EN
ch
6
5
LED6_RATIO_EN
LED5_RATIO_EN
3
LED4_RATIO_EN
Te
4
2
Default
LED3_RATIO_EN
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Access
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
ni
Bit
OUTPUT DIRECT/RATIOMETRIC LSB
Bit Description
0: Disables ratiometric dimming for LED8 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED7 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED6 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED5 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED4 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED3 output.
1: enables ratiometric dimming for LED9 output.
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Datasheet - D e t a i l e d D e s c r i p t i o n
Table 11. OUTPUT DIRECT / RATIOMETRIC LSB Register
OUTPUT DIRECT/RATIOMETRIC LSB
Bit
Bit Name
1
LED2_RATIO_EN
0
LED1_RATIO_EN
Default
Access
0
R/W
0
R/W
Bit Description
0: Disables ratiometric dimming for LED2 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED1 output.
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id
Register: 0x03
1: enables ratiometric dimming for LED9 output.
8.10.4 OUTPUT ON/OFF CONTROL MSB and LSB
lv
The following two registers allow the user to switch all nine current sources independently from each other on and off.
Please mind that this selection will be overridden if a current source is selected by one of the program execution
engines.
Table 12. OUTPUT ON/OFF CONTROL MSB Register
Bit
Bit Name
0
LED9_ON
OUTPUT ON/OFF CONTROL MSB
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Register: 0x04
Default
0
Access
Bit Description
0: LED9 output off.
R/W
1: LED9 output on.
Table 13. OUTPUT ON/OFF CONTROL LSB Register
Register: 0x05
Bit
Bit Name
7
LED8_ON
4
3
2
LED5_ON
LED4_ON
LED3_ON
LED2_ON
ch
1
LED6_ON
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
LED1_ON
0
R/W
0
R/W
Bit Description
0: LED8 output off.
1: LED8 output on.
0: LED7 output off.
1: LED7 output on.
0: LED6 output off.
1: LED6 output on.
0: LED5 output off.
1: LED5 output on.
0: LED4 output off.
1: LED4 output on.
0: LED3 output off.
1: LED3 output on.
0: LED2 output off.
1: LED2 output on.
0: LED1 output off.
1: LED1 output on.
Te
0
Access
ca
5
LED7_ON
Default
ni
6
OUTPUT ON/OFF CONTROL LSB
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Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.5 LEDx Control
al
id
These registers are used to assign the any current source output to the MASTER FADER group 1, 2, or 3, or none of
them. Also, the registers set the slope of the current sources output temperature compensation line and selects
between linear and logarithmic PWM brightness adjustment. By using logarithmic PWM-scale the visual effect looks
like linear. When the logarithmic adjustment is enabled, the chip handles internally PWM values with 12-bit resolution.
This allows very fine-grained PWM control at low PWM duty cycles. If a MASTER FADER is selected for an output, the
duty cycle on the output will be LED1 PWM register value (address 0x16) multiplied with the value in the MASTER
FADER register.
Besides the LED mapping and linear or logarithmic selection it is also possible to do a temperature compensation for
each output separately. The PWM duty cycle at temperature T (in centigrade) can be obtained as follows: PWMF =
[PWMS - (25 - T) * slope * PWMS] / 2, where PWMF is the final duty cycle at temperature T, PWMS is the set PWM duty
cycle (PWM duty cycle is set in registers 16H to 1EH) and the value of the correction factor is obtained from Table 8.
lv
For example, if the set PWM duty cycle in register 16H is 90%, temperature T is -10°C and the chosen s lope is +1.5 1/
°C, the final duty cycle PWMF for LED1 output will be [90% - (25°C - (-10°C))* 1.5 1/°C * 90%]/2 = [90 % - 35 * 1.5 *
90%]/2 = 21.4%. Default setting 00000 means that the temperature compensation is non-active and the PWM output
(0 to 100%) is set solely by PWM registers LED1 PWM to LED9 PWM.
Register: 0x06
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Table 14. LED1 CONTROL Register
Bit
Bit Name
7:6
LED1_MAPPING
LED1 CONTROL
Default
Access
Bit Description
This register defines the mapping of LED1 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00
R/W
00: no master fader selected
01: MASTER FADER 1 controls LED1 output
10: MASTER FADER 2 controls LED1 output
11: MASTER FADER 3 controls LED1 output
5
LED1_LOG_EN
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
LED1_TEMP_COMP
ca
4:0
R/W
11111: -1.5 1/°C
11110: -1.4 1/°C
...
00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
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0 0000
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
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Datasheet - D e t a i l e d D e s c r i p t i o n
Table 15. LED2 CONTROL Register
Register: 0x07
LED2 CONTROL
Bit Name
Default
7:6
LED2_MAPPING
Access
Bit Description
This register defines the mapping of LED2 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00
R/W
00: no master fader selected
01: MASTER FADER 1 controls LED2 output
10: MASTER FADER 2 controls LED2 output
11: MASTER FADER 3 controls LED2 output
LED2_LOG_EN
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
LED2_TEMP_COMP
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
am
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4:0
lv
5
al
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Bit
11111: -1.5 1/°C
0 0000
R/W
11110: -1.4 1/°C
...
00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
Table 16. LED3 CONTROL Register
Register: 0x08
Bit Name
7:6
LED3_MAPPING
Default
Access
ca
Bit
LED3 CONTROL
R/W
This register defines the mapping of LED3 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00: no master fader selected
01: MASTER FADER 1 controls LED3 output
10: MASTER FADER 2 controls LED3 output
11: MASTER FADER 3 controls LED3 output
Te
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00
Bit Description
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 16. LED3 CONTROL Register
Register: 0x08
LED3 CONTROL
Bit
Bit Name
Default
5
LED3_LOG_EN
Access
Bit Description
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
4:0
LED3_TEMP_COMP
al
id
1: logarithmic adjustment.
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
0 0000
R/W
lv
11111: -1.5 1/°C
11110: -1.4 1/°C
...
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00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
Table 17. LED4 CONTROL Register
Register: 0x09
Bit
Bit Name
7:6
LED4_MAPPING
LED1 CONTROL
Default
Access
Bit Description
This register defines the mapping of LED4 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00
R/W
00: no master fader selected
01: MASTER FADER 1 controls LED4 output
10: MASTER FADER 2 controls LED4 output
11: MASTER FADER 3 controls LED4 output
5
LED4_LOG_EN
This bit is effective for both, program execution engine and
direct PWM control.
ni
LED4_TEMP_COMP
Te
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4:0
R/W
ca
0
0: linear adjustment.
1: logarithmic adjustment.
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
11111: -1.5 1/°C
0 0000
R/W
11110: -1.4 1/°C
...
00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 18. LED5 CONTROL Register
Register: 0x0A
LED1 CONTROL
Bit Name
Default
7:6
LED5_MAPPING
Access
Bit Description
This register defines the mapping of LED5 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00
R/W
00: no master fader selected
01: MASTER FADER 1 controls LED5 output
10: MASTER FADER 2 controls LED5 output
11: MASTER FADER 3 controls LED5 output
LED5_LOG_EN
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
LED5_TEMP_COMP
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
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4:0
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5
al
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Bit
11111: -1.5 1/°C
0 0000
R/W
11110: -1.4 1/°C
...
00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
Table 19. LED6 CONTROL Register
Register: 0x0B
Bit Name
7:6
LED6_MAPPING
Default
Access
ca
Bit
LED6 CONTROL
R/W
This register defines the mapping of LED6 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00: no master fader selected
01: MASTER FADER 1 controls LED6 output
10: MASTER FADER 2 controls LED6 output
11: MASTER FADER 3 controls LED6 output
Te
ch
ni
00
Bit Description
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Datasheet - D e t a i l e d D e s c r i p t i o n
Table 19. LED6 CONTROL Register
Register: 0x0B
LED6 CONTROL
Bit
Bit Name
Default
5
LED6_LOG_EN
Access
Bit Description
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
4:0
LED6_TEMP_COMP
al
id
1: logarithmic adjustment.
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
0 0000
R/W
lv
11111: -1.5 1/°C
11110: -1.4 1/°C
...
am
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on A
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00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
Table 20. LED7 CONTROL Register
Register: 0x0C
Bit
Bit Name
7:6
LED7_MAPPING
LED7 CONTROL
Default
Access
Bit Description
This register defines the mapping of LED7 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00
R/W
00: no master fader selected
01: MASTER FADER 1 controls LED7 output
10: MASTER FADER 2 controls LED7 output
11: MASTER FADER 3 controls LED7 output
5
LED7_LOG_EN
This bit is effective for both, program execution engine and
direct PWM control.
ni
LED7_TEMP_COMP
Te
ch
4:0
R/W
ca
0
0: linear adjustment.
1: logarithmic adjustment.
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
11111: -1.5 1/°C
0 0000
R/W
11110: -1.4 1/°C
...
00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
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Datasheet - D e t a i l e d D e s c r i p t i o n
Table 21. LED8 CONTROL Register
Register: 0x0D
LED8 CONTROL
Bit Name
Default
7:6
LED8_MAPPING
Access
Bit Description
This register defines the mapping of LED8 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00
R/W
00: no master fader selected
01: MASTER FADER 1 controls LED8 output
10: MASTER FADER 2 controls LED8 output
11: MASTER FADER 3 controls LED8 output
LED8_LOG_EN
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
LED8_TEMP_COMP
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
am
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4:0
lv
5
al
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Bit
11111: -1.5 1/°C
0 0000
R/W
11110: -1.4 1/°C
...
00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
Table 22. LED9 CONTROL Register
Register: 0x0E
Bit Name
7:6
LED9_MAPPING
Default
Access
ca
Bit
LED9 CONTROL
R/W
This register defines the mapping of LED9 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00: no master fader selected
01: MASTER FADER 1 controls LED9 output
10: MASTER FADER 2 controls LED9 output
11: MASTER FADER 3 controls LED9 output
Te
ch
ni
00
Bit Description
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Datasheet - D e t a i l e d D e s c r i p t i o n
Table 22. LED9 CONTROL Register
Register: 0x0E
LED9 CONTROL
Bit
Bit Name
Default
5
LED9_LOG_EN
Access
Bit Description
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
4:0
LED8_TEMP_COMP
al
id
1: logarithmic adjustment.
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
0 0000
R/W
lv
11111: -1.5 1/°C
11110: -1.4 1/°C
...
am
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on A
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nt
st
il
00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
8.10.6 LEDx PWM
This is the PWM duty cycle control for LED1 to LED9 output. The PWM registers are effective during direct control
operation. Direct PWM control is active after power up by default.
Note: Serial bus address auto increment is not supported for register addresses from 16 to 1E.
Note: If the temperature compensation is active, the maximum PWM duty cycle is 50% at +25°C. This is require d to
allow enough headroom for temperature compensation over the temperature range -40 °C to 90°C.
Table 23. LED1 PWM Register
LED1 PWM
ca
Register: 0x16
Bit Name
7:0
LED1_PWM
Default
ni
Bit
Bit Description
This register controls the duty cycle of LED1 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
R/W
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
1111 1111: 100% Duty Cycle
Te
ch
0000 0000
Access
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Revision 1.3
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 24. LED2 PWM Register
Register: 0x17
LED2 PWM
Bit
Bit Name
Default
7:0
LED2_PWM
Access
Bit Description
This register controls the duty cycle of LED2 PWM output.
0000 0000: 0% Duty Cycle
0000 0000
R/W
al
id
0000 0001: 0.3921% Duty Cycle
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
Table 25. LED3 PWM Register
Register: 0x18
LED3 PWM
Bit Name
7:0
LED3_PWM
Default
Access
Bit Description
am
lc s
on A
te G
nt
st
il
Bit
lv
1111 1111: 100% Duty Cycle
This register controls the duty cycle of LED3 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
0000 0000
R/W
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
1111 1111: 100% Duty Cycle
Table 26. LED4 PWM Register
Register: 0x19
Bit
Bit Name
7:0
LED4_PWM
LED4 PWM
Default
Access
Bit Description
This register controls the duty cycle of LED4 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
R/W
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
1111 1111: 100% Duty Cycle
ni
ca
0000 0000
Table 27. LED5 PWM Register
ch
Register: 0x1A
Bit Name
LED5_PWM
Te
Bit
7:0
Default
LED5 PWM
Access
Bit Description
This register controls the duty cycle of LED5 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
0000 0000
R/W
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
1111 1111: 100% Duty Cycle
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Revision 1.3
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 28. LED6 PWM Register
Register: 0x1B
LED6 PWM
Bit
Bit Name
Default
7:0
LED6_PWM
Access
Bit Description
This register controls the duty cycle of LED6 PWM output.
0000 0000: 0% Duty Cycle
0000 0000
R/W
al
id
0000 0001: 0.3921% Duty Cycle
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
Table 29. LED7 PWM Register
Register: 0x1C
LED7 PWM
Bit Name
7:0
LED7_PWM
Default
Access
Bit Description
am
lc s
on A
te G
nt
st
il
Bit
lv
1111 1111: 100% Duty Cycle
This register controls the duty cycle of LED7 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
0000 0000
R/W
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
1111 1111: 100% Duty Cycle
Table 30. LED8 PWM Register
Register: 0x1D
Bit
Bit Name
7:0
LED8_PWM
LED8 PWM
Default
Access
Bit Description
This register controls the duty cycle of LED8 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
R/W
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
1111 1111: 100% Duty Cycle
ni
ca
0000 0000
Table 31. LED9 PWM Register
ch
Register: 0x1E
Bit Name
LED9_PWM
Te
Bit
7:0
Default
LED9 PWM
Access
Bit Description
This register controls the duty cycle of LED9 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
0000 0000
R/W
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
1111 1111: 100% Duty Cycle
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Revision 1.3
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.7 LEDx CURRENT CONTROL
With the following register it is possible to control the output current of each current source separately. The resolution
of the current sources is 8-bit which gives a step size is 100 µA with a maximum output current of 25.5mA per current
source.
Table 32. LED1 CURRENT CONTROL Register
LED1 CURRENT CONTROL
Bit
Bit Name
Default
7:0
LED1_CURRENT
Access
Bit Description
al
id
Register: 0x26
This register controls the output current of current source
LED1 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
1010 1111
R/W
lv
0000 0001: 0.1mA
...
1010 1111: 17.5mA
am
lc s
on A
te G
nt
st
il
...
1111 1110: 25.4mA
1111 1111: 25.5mA
Table 33. LED2 CURRENT CONTROL Register
Register: 0x27
Bit
Bit Name
7:0
LED2_CURRENT
LED2 CURRENT CONTROL
Default
Access
Bit Description
This register controls the output current of current source
LED2 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
1010 1111
R/W
...
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 1111: 25.5mA
ca
Table 34. LED3 CURRENT CONTROL Register
Register: 0x28
Bit Name
7:0
LED3_CURRENT
Default
Access
Te
ch
ni
Bit
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LED3 CURRENT CONTROL
Bit Description
This register controls the output current of current source
LED3 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
1010 1111
R/W
...
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 1111: 25.5mA
Revision 1.3
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 35. LED4 CURRENT CONTROL Register
Register: 0x29
LED4 CURRENT CONTROL
Bit
Bit Name
Default
7:0
LED4_CURRENT
Access
Bit Description
This register controls the output current of current source
LED4 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
1010 1111
R/W
al
id
0000 0001: 0.1mA
...
1010 1111: 17.5mA
...
lv
1111 1110: 25.4mA
1111 1111: 25.5mA
Register: 0x2A
am
lc s
on A
te G
nt
st
il
Table 36. LED5 CURRENT CONTROL Register
Bit
Bit Name
7:0
LED5_CURRENT
LED5 CURRENT CONTROL
Default
Access
Bit Description
This register controls the output current of current source
LED5 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
1010 1111
R/W
...
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 1111: 25.5mA
Table 37. LED6 CURRENT CONTROL Register
Register: 0x2B
Bit Name
7:0
LED6_CURRENT
Default
Access
ni
ca
Bit
LED6 CURRENT CONTROL
R/W
This register controls the output current of current source
LED6 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
...
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 1111: 25.5mA
Te
ch
1010 1111
Bit Description
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 38. LED7 CURRENT CONTROL Register
Register: 0x2C
LED7 CURRENT CONTROL
Bit
Bit Name
Default
7:0
LED7_CURRENT
Access
Bit Description
This register controls the output current of current source
LED7 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
1010 1111
R/W
al
id
0000 0001: 0.1mA
...
1010 1111: 17.5mA
...
lv
1111 1110: 25.4mA
1111 1111: 25.5mA
Register: 0x2D
am
lc s
on A
te G
nt
st
il
Table 39. LED8 CURRENT CONTROL Register
Bit
Bit Name
7:0
LED8_CURRENT
LED8 CURRENT CONTROL
Default
Access
Bit Description
This register controls the output current of current source
LED8 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
1010 1111
R/W
...
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 1111: 25.5mA
Table 40. LED9 CURRENT CONTROL Register
Register: 0x2E
Bit Name
7:0
LED9_CURRENT
Default
Access
ni
ca
Bit
LED9 CURRENT CONTROL
R/W
This register controls the output current of current source
LED9 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
...
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 1111: 25.5mA
Te
ch
1010 1111
Bit Description
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Revision 1.3
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.8 MISC
This register contains miscellaneous control bits like the clock detection. Program execution is clocked with internal
32.7 kHz clock or with external clock. External clock can be used if a clock signal is present on CLK-pin. The external
clock frequency must be 32.7 kHz in oder to meet the timing specifications of the datasheet and for correct operation.
If a higher or a lower frequency is used, it will affect on the program execution engine operation speed. The detector
block does not limit the maximum frequency. External clock status can be checked with read only bit EXT_CLK_USED
in register address 3A, when the external clock detection is enabled (Bit [1] CLK_DET_EN = high).
Table 41. OUTPUT ON/OFF CONTROL LSB Register
Register: 0x05
OUTPUT ON/OFF CONTROL LSB
Bit Name
Default
7
VARIABLE_D_SEL
Bit Description
R/W
The variable D can be linked to two different sources. The
default source for variable D is register 0x3C but it can be
assigned to the LED test ADC output. This allows, for example,
program execution control with an analog signal.
am
lc s
on A
te G
nt
st
il
0
Access
lv
Bit
al
id
If external clock is not used in the application, CLK pin should be connected to GND to avoid oscillation on this pin and
extra current consumption.
0: variable D source is register 0x3C
1: variable D source is LED test ADC.
6
EN_AUTO_INCR
1
R/W
The automatic increment feature of the serial bus address
enables a quick memory write of successive registers within
one transmission.
0: serial bus address automatic increment is disabled.
1: serial bus address automatic increment is enabled.
5
POWERSAVE_EN
Please refer to section 8.14.9 for a detailed description of the
powersave mode of AS3661.
0
R/W
0: power save mode is disabled.
1: power save mode is enabled.
4:3
CP_MODE
This register bits control the operation mode of the integrated
charge pump. The charge pump can be switched off, forced to
bypass mode, forced to 1.5x mode and automatic operation.
00
R/W
00: CP is switched off.
PWM_PS_EN
ni
2
ca
01: CP is forced to bypass mode (1x).
R/W
11: CP is in automatic mode depending on load conditions
For a detailed description of this power save mode please refer
to section 8.14.10. This mode can only be used if the CP is in
off mode or 1x mode.
0: PWM power save mode disabled.
ch
0
10: CP is forced to 1.5x mode (output voltage is 4.5V)
1: PWM power save mode enabled.
CLK_DET_EN
The following bits define the clock selection of AS3661.
0
INT_CLK_EN
00: forced external clock (CLK pin).
Te
1
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00
R/W
01: forced internal clock.
10: automatic clock selection.
11: internal clock.
Revision 1.3
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.9 ENGINEx PC
The program counter defines the starting value for each program execution engine. It can be any value between 000
0000 to 101 1111. The maximum value depends on program memory allocation between the three program execution
engines.
Table 42. ENGINE1 PC Register
Register: 0x37
ENGINE1 PC
Bit Name
6:0
ENGINE1_PC
Default
Access
Bit Description
000 0000
R/W
Program counter value for execution engine1 from 000 0000 to
101 1111 depending on the memory allocation of the
application.
Register: 0x38
ENGINE2 PC
Bit Name
Default
6:0
ENGINE2_PC
Access
Bit Description
Program counter value for execution engine2 from 000 0000 to
101 1111 depending on the memory allocation of the
application.
am
lc s
on A
te G
nt
st
il
Bit
lv
Table 43. ENGINE2 PC Register
al
id
Bit
000 0000
R/W
Table 44. ENGINE3 PC Register
Register: 0x39
Bit
Bit Name
6:0
ENGINE3_PC
ENGINE3 PC
Default
Access
000 0000
R/W
Bit Description
Program counter value for execution engine 3 from 000 0000
to 101 1111 depending on the memory allocation of the
application.
8.10.10 STATUS/INTERRUPT
This register contains several status and interrupt registers.
Table 45. STATUS / INTERRUPT Register
Register: 0x3A
Bit Name
7
LEDTEST_MEAS_D
ONE
Default
Access
ca
Bit
STATUS / INTERRUPT
0: LED test not done.
1: LED test done.
MASK_BUSY
Mask bit for interrupts generated by STARTUP_BUSY or
ENGINE_BUSY.
Te
ch
6
R/W
ni
0
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1
Bit Description
This bit indicates when the LED test is done, and the result is
written to the LED_TEST_ADC register (0x42). Typically the
conversion takes 2.7 milliseconds to complete. The bit will not
be cleared after conversion. Each write command to this
register starts another conversion.
R/W
0: External interrupt will be generated when STARTUP_BUSY
or ENGINE_BUSY condition is no longer true. Reading the
register 3A clears the status bits [5:4] and releases INT pin to
high state.
1: Interrupt events will be masked i.e. no external interrupt
will be generated from STARTUP_BUSY or ENGINE_BUSY
event (default).
Revision 1.3
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AS3661
Datasheet
Table 45. STATUS / INTERRUPT Register
Register: 0x3A
STATUS / INTERRUPT
Bit Name
Default
5
STARTUP_BUSY
Access
Bit Description
R
A status bit which indicates that the device is running the
internal start-up sequence. Please note that STARTUP_BUSY
bit is always “1” when CHIP_EN bit is “0”. Please refer to
section 8.5 for detailed startup mode description.
0
0: internal start-up sequence completed.
1: internal start-up sequence running.
ENGINE_BUSY
0
R
A status bit which indicates that a program execution engine is
clearing internal registers. Serial bus master should not write
or read program memory, or registers 0x00, 0x37 to 0x39 or
0x4C to 0x4E, when this bit is set to "1".
0: engine ready.
lv
4
al
id
Bit
3
am
lc s
on A
te G
nt
st
il
1: at least one of the engines is clearing internal registers.
EXT_CLK_USED
0
R
This bit is high when external clock signal on CLK pin is
detected. CLK_DET_EN bit high in address 36 enables the
clock detection.
0: external clock not detected.
1: external clock detected.
2
ENG1_INT
0
R
This is the interrupt status bit for program execution engine 1.
The bit is set by END or INT instruction. Reading the interrupt
bit clears the interrupt.
0: interrupt unset/cleared.
1: interrupt set.
1
ENG2_INT
0
R
This is the interrupt status bit for program execution engine 2.
The bit is set by END or INT instruction. Reading the interrupt
bit clears the interrupt.
0: interrupt unset/cleared.
1: interrupt set.
ENG3_INT
ca
0
R
0: interrupt unset/cleared.
1: interrupt set.
Te
ch
ni
0
This is the interrupt status bit for program execution engine 3.
The bit is set by END or INT instruction. Reading the interrupt
bit clears the interrupt.
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.11 GPO
AS3661 has one General Purpose Output pin (GPO). Status of the pin can be controlled with this register. Also, INT
pin can be configured to function as a GPO by setting the bit EN_GPO_INT. When INT is configured to function as a
GPO, output level is defined by the VBAT voltage.
When INT pin’s GPO function is disabled, it operates as an open drain pin. INT signal is active low, i.e. when interrupt
signal is send, the pin is pulled to GND. External pull-up resistor is needed for proper functionality.
Register: 0x3B
GPO
Bit Name
Default
2
INT_CONF
Access
Bit Description
This bit defines the function of GPO pin. It can either be
configures as interrupt pin or as general purpose output pin.
0
R/W
0: INT pin is set to function as an interrupt pin.
lv
Bit
al
id
Table 46. GPO Register
1: INT pin is configured to function as a GPO.
GPO
This register controls the state of pin GPO.
0: GPO pin state is low.
am
lc s
on A
te G
nt
st
il
1
0
R/W
1: GPO pin state is high. GPO pin is a digital CMOS output,
and no pulldown resistor is needed.
0
INT_GPO
0
R/W
If INT pin is defined as general purpose output (INT_CONF bit
must be set to”1”), it is possible to control the INT pin with this
bit.
0: INT pin state is low (if INT_CONF = 1).
1: INT pin state is high (if INT_CONF = 1).
8.10.12 VARIABLE
The variable can be sued to store data in order to control for example the data flow.
Table 47. GPO Register
Register: 0x3C
Bit Name
7:0
VARIABLE_D
Access
Bit Description
0000 0000
R/W
These bits are used for storing a global 8–bit variable. Variable
can be used to control program flow.
ni
8.10.13 RESET
Default
ca
Bit
GPO
Table 48. RESET Register
ch
Register: 0x3D
Bit Name
7:0
RESET
Te
Bit
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RESET
Default
Access
0000 0011
R/W
Bit Description
Writing 11111111 into this register resets the AS3661. Internal
registers are reset to the default values. Reading RESET
register returns 00000011.
Revision 1.3
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.14 TEMP ADC CONTROL
Table 49. TEMP ADC CONTROL Register
Register: 0x3E
TEMP ADC CONTROL
Bit Name
Default
7
TEMP_MEAS_BUSY
Access
Bit Description
Indicates the status of the temperature measurement ADC of
AS3661.
0
R
0: temperature measurements done or not activated.
1: temperature measurement active.
EN_TEMP_SENSOR
0
R/W
Every time when EN_TEMP_SENSOR is written high a new
measurement period is started. The length of the
measurement period depends on temperature. At 25°C a
measurement takes 20 milliseconds. Temperature can be read
from register 0x3F.
0: temperature sensor disabled.
lv
2
al
id
Bit
1
am
lc s
on A
te G
nt
st
il
1: enable internal temperature sensor and start measurement.
CONTINUOUS_CON
V
When EN_TEMP_SENSOR bit is set to”1” it is possible to
enable a continuous temperature conversation setting the
CONTINUOUS_CONV bit in this register.
0
R/W
0: new temperature measurement period initiated during
start-up or after exit from power save mode.
1: continuous temperature measurement. Not active when the
device is in powersave.
0
SEL_EXT_TEMP
0
R/W
It is possible to link the temperature compensation register
either to the internal temperature measurement result register
0x3F or to the TEMPERATURE WRITE register 0x40. This
register can be sued to store the temperature of an external
temperature measurement device to AS3661 in order to use it
for LED temperature compensation.
0: temperature compensation source register addr 3FH.
1: temperature compensation source register addr 40H.
ca
8.10.15 TEMPERATURE READ
Table 50. TEMPERATURE READ Register
Register: 0x3F
Bit Name
7:0
TEMPERATURE
_READ
Default
Access
Te
ch
ni
Bit
TEMPERATURE READ
Bit Description
These bits are used for storing an 8-bit temperature reading
acquired from the internal temperature sensor. This register is
a read-only register. Temperature reading is stored in 8-bit
two's complement format, see the table below.
1101 1010: -38°C
0001 1001
R
...
0001 1001: 25°C
...
0101 1000: 88°C
0101 1001: 89°C
Note: When writing temperature data outside the range of the temperature compensation: Values greater than 89°C
will be set to 89°C; values less than -38°C will be set to -38°C.
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.16 TEMPERATURE WRITE
Table 51. TEMPERATURE WRITE Register
Register: 0x40
TEMPERATURE WRITE
Bit Name
Default
7:0
TEMPERATURE
_WRITE
Access
Bit Description
These bits are used for storing an 8-bit temperature reading
acquired from an external temperature sensor, if such a sensor
is used. Temperature reading is stored in 8-bit two's
complement format, see the table below.
al
id
Bit
1101 1010: -38°C
0000 0000
R/W
...
lv
0001 1001: 25°C
...
0101 1000: 88°C
am
lc s
on A
te G
nt
st
il
0101 1001: 89°C
Note: When writing temperature data outside the range of the temperature compensation: Values greater than 89°C
will be set to 89°C; values less than -38°C will be set to -38°C.
8.10.17 LED TEST CONTROL
Table 52. LED TEST CONTROL Register
Register: 0x41
Bit
Bit Name
7
EN_LED_TEST
_ADC
LED TEST CONTROL
Default
0
Access
Bit Description
R/W
Writing this bit high (1) fires single LED test conversation. Thus
each time you want to start a conversion it is necessary to
write a “1” to this register. The measurement cycle is 2.7
milliseconds per conversion.
0: LED test measurement disabled.
1: LED test measurement enabled
EN_LED_TEST_INT
This register enabled the interrupt for the LED test ADC.
Interrupt can be cleared by reading STATUS/INTERRUPT
register 0x3A.
ca
6
R/W
0: no interrupt signal will be send to the INT pin when the
LED test is accomplished.
1: interrupt signal will be send to the INT pin when the LED test
is accomplished.
Te
ch
ni
0
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 52. LED TEST CONTROL Register
Register: 0x41
LED TEST CONTROL
Bit Name
Default
5
CONTINUOUS
_CONV
Access
Bit Description
When EN_LED_TEST_ADC bit is set to”1”, it is possible to
enable a continuous conversation setting the
CONTINUOUS_CONV bit to “1” in this register.
0
R/W
0: continuous conversion is disabled.
al
id
Bit
1: continuous LED test measurement. Not active in powersave
mode.
LED_TEST_CTRL
These bits are used for choosing the LED driver output to be
measured with the LED test ADC. In addition to the LED
outputs is is possible to measure VDD , INT-pin and chargepump output voltage as well.
lv
4:0
0 0000: LED1
am
lc s
on A
te G
nt
st
il
0 0001: LED2
0 0010: LED3
0 0011: LED4
0 0100: LED5
0 0000
R/W
0 0101: LED6
0 0110: LED7
0 0111: LED8
0 1000: LED9
0 1001 to 0 1110: reserved, do not use
0 1111: VCP
1 0000: VBAT
1 0001: INT-pin
10010 to 11111: reserved, do not use
8.10.18 LED TEST ADC
Table 53. LED TEST ADC Register
LED TEST ADC
ca
Register: 0x42
Bit Name
LED_TEST_ADC
Default
ni
Bit
7:0
R
Bit Description
This is used to store the LED test result. Read-only register.
LED test ADC least significant bit corresponds to 30mV. The
measured voltage V (typ.) is calculated as follows: V =
(RESULT(DEC) x 0.03 - 1.478 V. For example, if the result is
10100110 = 166(DEC), the measured voltage is 3.50V
(typ.)(see Figure 28 on page 58).
Te
ch
N/A
Access
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Revision 1.3
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 28. LED Test Results vs. Measured Voltage
5
3
2
al
id
VOLTAGE (V)
4
1
0
40
90
140
190
8.10.19 ENGINE1 VARIABLE A
Table 54. ENGINE1 VARIABLE A Register
ENGINE1 VARIABLE A
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Register: 0x45
lv
RESULT (DEC)
Bit
Bit Name
7:0
ENGINE1_
VARIABLE_A
Default
Access
Bit Description
0000 0000
R
These bits are used for engine 1 as a local variable. The
register is a read only register and can be used for example for
arithmetic operations with the program execution engine.
8.10.20 ENGINE2 VARIABLE A
Table 55. ENGINE2 VARIABLE A Register
Register: 0x46
Bit
Bit Name
7:0
ENGINE2_
VARIABLE_A
ENGINE2 VARIABLE A
Default
Access
Bit Description
0000 0000
R
These bits are used for engine 2 as a local variable. The
register is a read only register and can be used for example for
arithmetic operations with the program execution engine.
8.10.21 ENGINE3 VARIABLE A
Table 56. ENGINE3 VARIABLE A Register
ca
Register: 0x47
ENGINE3 VARIABLE A
Bit Name
Default
Access
Bit Description
7:0
ENGINE3_
VARIABLE_A
0000 0000
R
These bits are used for engine 3 as a local variable. The
register is a read only register and can be used for example for
arithmetic operations with the program execution engine.
ch
ni
Bit
8.10.22 MASTER FADER1
Table 57. MASTER FADER1 Register
Te
Register: 0x48
Bit
Bit Name
7:0
MASTER_FADER1
MASTER FADER1
Default
0000 0000
www.austriamicrosystems.com
Access
Bit Description
R/W
An 8-bit register to control all the LED-drivers mapped to
MASTER FADER1. Master fader allows the user to control
dimming of multiple LEDS with a single serial bus write. This is
a faster method to control the dimming of multiple LEDs
compared to the dimming done with the PWM registers
(address 0x16 to 0x1E), which would need multiple writes.
Revision 1.3
58 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.23 49 MASTER FADER2
Table 58. MASTER FADER2 Register
Register: 0x49
MASTER FADER2
Default
7:0
MASTER_FADER2
0000 0000
Access
Bit Description
R/W
An 8-bit register to control all the LED-drivers mapped to
MASTER FADER2. Master fader allows the user to control
dimming of multiple LEDS with a single serial bus write. This is
a faster method to control the dimming of multiple LEDs
compared to the dimming done with the PWM registers
(address 0x16 to 0x1E), which would need multiple writes.
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Bit Name
8.10.24 4A MASTER FADER3
Table 59. MASTER FADER3 Register
Register: 0x4A
MASTER FADER3
Bit Name
7:0
MASTER_FADER3
Default
Access
Bit Description
R/W
An 8-bit register to control all the LED-drivers mapped to
MASTER FADER3. Master fader allows the user to control
dimming of multiple LEDS with a single serial bus write. This is
a faster method to control the dimming of multiple LEDs
compared to the dimming done with the PWM registers
(address 0x16 to 0x1E), which would need multiple writes.
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Bit
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Bit
0000 0000
8.10.25 ENG1 PROG START ADDR
Table 60. ENG1 PROG START ADDR Register
Register: 0x4C
Bit
Bit Name
6:0
ENG1_PROG_
START_ADDR
ENG1 PROG START ADDR
Default
000 0000
Access
R/W
Bit Description
The program memory start address for program execution
engine 1 is defined in this register.
8.10.26 ENG2 PROG START ADDR
ca
Table 61. ENG2 PROG START ADDR Register
Register: 0x4D
Bit Name
Default
Access
6:0
ENG2_PROG_
START_ADDR
000 0000
R/W
ni
Bit
ENG2 PROG START ADDR
Bit Description
The program memory start address for program execution
engine 2 is defined in this register.
ch
8.10.27 ENG3 PROG START ADDR
Table 62. ENG2 PROG START ADDR Register
Te
Register: 0x4E
ENG3 PROG START ADDR
Bit
Bit Name
Default
Access
6:0
ENG3_PROG_
START_ADDR
000 0000
R/W
www.austriamicrosystems.com
Bit Description
The program memory start address for program execution
engine 3 is defined in this register.
Revision 1.3
59 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.28 PROG MEM PAGE SELECT
Table 63. PROG MEM PAGE SEL Register
Register: 0x4F
PROG MEM PAGE SEL
Bit Name
Default
2:0
PAGE_SEL
Access
Bit Description
These bits select the program memory page. The program
memory is divided into six pages of 16 instructions; thus the
total amount of the program memory is 96 instructions.
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id
Bit
000: Program Memory 0x00 - 0x0F selected.
000
R/W
001: Program Memory 0x10 - 0x1F selected.
010: Program Memory 0x20 - 0x2F selected.
lv
011: Program Memory 0x30 - 0x3F selected.
100: Program Memory 0x40 - 0x4F selected.
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101: Program Memory 0x50 - 0x5F selected.
8.10.29 ENG1 MAPPING MSB
Table 64. ENG1 MAPPING MSB Register
Register: 0x70
Bit
Bit Name
7
ENG1_GPO
0
ENG1_LED9
ENG1 MAPPING MSB
Default
Access
0
R
0
R
Bit Description
0: GPO pin non-mapped to the program exec. engine 1.
1: GPO pin is mapped to the program execution engine 1.
0: LED9 pin non-mapped to the program exec. engine1.
1: LED9 pin is mapped to the program execution engine 1.
8.10.30 71H ENG1 MAPPING LSB
Table 65. ENG1 MAPPING LSB Register
Register: 0x71
Bit Name
7
ENG1_LED8
Access
0
ENG1_LED7
5
ENG1_LED6
0
ni
6
ENG1_LED5
3
ENG1_LED4
Te
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4
2
ENG1_LED3
1
ENG1_LED2
0
Default
ca
Bit
ENG1 MAPPING LSB
ENG1_LED1
www.austriamicrosystems.com
R
R
0
R
0
R
0
R
0
R
0
R
0
R
Bit Description
0: LED8 pin non-mapped to the program exec. engine 1.
1: LED8 pin is mapped to the program execution engine 1.
0: LED7 pin non-mapped to the program exec. engine 1.
1: LED7 pin is mapped to the program execution engine 1.
0: LED6 pin non-mapped to the program exec. engine 1.
1: LED6 pin is mapped to the program execution engine1.
0: LED5 pin non-mapped to the program exec. engine 1.
1: LED5 pin is mapped to the program execution engine 1.
0: LED4 pin non-mapped to the program exec. engine 1.
1: LED4 pin is mapped to the program execution engine 1.
0: LED3 pin non-mapped to the program exec. engine 1.
1: LED3 pin is mapped to the program execution engine 1.
0: LED2 pin non-mapped to the program exec. engine 1.
1: LED2 pin is mapped to the program execution engine 1.
0: LED1 pin non-mapped to the program exec. engine 1.
1: LED1 pin is mapped to the program execution engine 1.
Revision 1.3
60 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.31 ENG2 MAPPING MSB
Table 66. ENG2 MAPPING MSB Register
ENG2 MAPPING MSB
Bit
Bit Name
7
ENG2_GPO
0
Default
Access
0
R
0
R
ENG2_LED9
Bit Description
0: GPO pin non-mapped to the program exec. engine 2.
1: GPO pin is mapped to the program execution engine 2.
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Register: 0x72
0: LED9 pin non-mapped to the program exec. engine2.
1: LED9 pin is mapped to the program execution engine 2.
Table 67. ENG2 MAPPING LSB Register
Register: 0x73
ENG2 MAPPING LSB
Bit Name
7
ENG2_LED8
6
5
4
3
2
1
Access
ENG2_LED7
ENG2_LED6
ENG2_LED5
ENG2_LED4
ENG2_LED3
ENG2_LED2
ENG2_LED1
0
R
0
R
0
R
0
R
0
R
0
R
0
R
0
R
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0
Default
Bit Description
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Bit
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8.10.32 ENG2 MAPPING LSB
0: LED8 pin non-mapped to the program exec. engine 2.
1: LED8 pin is mapped to the program execution engine 2.
0: LED7 pin non-mapped to the program exec. engine 2.
1: LED7 pin is mapped to the program execution engine 2.
0: LED6 pin non-mapped to the program exec. engine 2.
1: LED6 pin is mapped to the program execution engine 2.
0: LED5 pin non-mapped to the program exec. engine 2.
1: LED5 pin is mapped to the program execution engine 2.
0: LED4 pin non-mapped to the program exec. engine 2.
1: LED4 pin is mapped to the program execution engine 2.
0: LED3 pin non-mapped to the program exec. engine 2.
1: LED3 pin is mapped to the program execution engine 2.
0: LED2 pin non-mapped to the program exec. engine 2.
1: LED2 pin is mapped to the program execution engine 2.
0: LED1 pin non-mapped to the program exec. engine 2.
1: LED1 pin is mapped to the program execution engine 2.
ni
8.10.33 ENG3 MAPPING MSB
Table 68. ENG3 MAPPING MSB Register
ch
Register: 0x74
Bit Name
7
ENG3_GPO
Te
Bit
0
ENG3_LED9
www.austriamicrosystems.com
ENG3 MAPPING MSB
Default
Access
0
R
0
R
Bit Description
0: GPO pin non-mapped to the program exec. engine 3.
1: GPO pin is mapped to the program execution engine 3.
0: LED9 pin non-mapped to the program exec. engine 3.
1: LED9 pin is mapped to the program execution engine 3.
Revision 1.3
61 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.34 ENG3 MAPPING LSB
Table 69. ENG3 MAPPING LSB Register
ENG3 MAPPING LSB
Bit Name
7
ENG3_LED8
5
4
3
2
1
ENG3_LED6
ENG3_LED5
ENG3_LED4
0
R
0
R
0
R
0
R
0
R
0
R
0
R
0
R
Bit Description
0: LED8 pin non-mapped to the program exec. engine 3.
1: LED8 pin is mapped to the program execution engine 3.
0: LED7 pin non-mapped to the program exec. engine 3.
1: LED7 pin is mapped to the program execution engine 3.
0: LED6 pin non-mapped to the program exec. engine 3.
1: LED6 pin is mapped to the program execution engine 3.
0: LED5 pin non-mapped to the program exec. engine 3.
1: LED5 pin is mapped to the program execution engine 3.
0: LED4 pin non-mapped to the program exec. engine 3.
ENG3_LED3
ENG3_LED2
ENG3_LED1
1: LED4 pin is mapped to the program execution engine 3.
0: LED3 pin non-mapped to the program exec. engine 3.
1: LED3 pin is mapped to the program execution engine 3.
0: LED2 pin non-mapped to the program exec. engine 3.
1: LED2 pin is mapped to the program execution engine 3.
0: LED1 pin non-mapped to the program exec. engine 3.
1: LED1 pin is mapped to the program execution engine 3.
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0
ENG3_LED7
Access
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6
Default
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Bit
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Register: 0x75
www.austriamicrosystems.com
Revision 1.3
62 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.10.35 GAIN CHANGE CTRL
With hysteresis and timer bits the user can optimize the charge pump performance to better meet the requirements of
the application at hand. Some applications need to be optimized for efficiency and others need to be optimized for
minimum EMI, for example.
Table 70. GAIN CHANGE CTRL Register
Register: 0x76
GAIN CHANGE CTRL
Default
7:6
TRESHOLD
00
Access
Bit Description
R/W
Bits set the threshold voltage at which the charge pump gain
changes from 1.5x to 1x. The threshold voltage is defined as
the voltage difference between highest voltage output (LED1
to LED6) and input voltage VBAT: VTRESHOLD = VBAT - MAX
(voltage on LED1 to LED6). If VTRESHOLD is larger than the set
value (100mV to 400mV), the charge pump is in 1x mode.
00: 400mV
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01: 300mV
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Bit Name
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Bit
10: 200mV
11: 100mV
5
ADAPTIVE_
TRESH_EN
0
R/W
Gain change hysteresis prevents the mode from toggling back
and forth (1x -> 1.5x -> 1x...) , which would cause ripple on VIN
and LED flicker. When the adaptive threshold is enabled, the
width of the hysteresis region depends on the choice of
TRESHOLD bits (see above), saturation of the current
sources, charge pump load current, PWM overlap and
temperature.
0: Adaptive threshold disabled.
1: Adaptive threshold enabled.
4:3
TIMER
00
R/W
A forced mode change from 1.5x to 1.0x is attempted at the
interval specified with these bits. Mode change is allowed if
there is enough voltage over the LED drivers to ensure proper
operation. Set FORCE_1x to "1" (see below) to activate this
feature.
00: 5ms
10: 50ms
11: infinite
FORCE_1x
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2
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01: 10ms
ch
0
R
Activates forced mode change. In forced mode charge pump
mode change from 1.5x to 1x is attempted at the interval
specified with the TIMER bits.
0: forced mode changes disabled.
1: forced mode changes disabled.
Te
Note: Values above are typical and should not be used as product specification. Writing to TRESHOLD [7:6] bits by
the user overrides factory settings. Factory settings aren't user accessible.
www.austriamicrosystems.com
Revision 1.3
63 - 85
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Table 71. LED Driver Instructions
Bit
[15]
Bit
[14]
ramp
1
RMP
0
prescale
ramp
2
RWV
1
0
1
SPW
0
1
2
SPV
1
0
WAIT
0
prescale
set_pwm
set_pwm
Revision 1.3
wait
1. This opcode is used with numerical operands.
2. This opcode is used with variables.
Table 72. LED Mapping Instructions
Bit
[15]
Bit
[14]
mux_ld_start
MLS
1
0
mux_map_start
MMS
1
0
mux_ld_end
MLE
1
0
mux_sel
MSL
1
0
mux_clr
MCL
1
0
mux_map_next
MMN
mux_map_prev
MMP
mux_ld_next
MLN
Bit
[12]
Bit
[11]
Bit
[10]
Bit
[9]
step time
Bit
[8]
Bit
[7]
Bit
[6]
Bit
[5]
sign
Bit
[4]
Bit
[3]
Bit
[2]
Bit
[1]
Bit
[0]
# of increments
0
step time
# of
increments
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
Bit
[6]
Bit
[5]
Bit
[4]
Bit
[3]
Bit
[2]
Bit
[1]
Bit
[0]
time
0
pre- sign
scale
0
PWM value
Bit
[13]
Bit
[12]
Bit
[11]
Bit
[10]
Bit
[9]
Bit
[8]
Bit
[7]
0
1
1
1
1
0
0
0
1
1
1
0
0
0
ca
Compiler
Command
PWM value
SRAM address 0-95
1
1
1
0
0
1
0
1
1
1
0
1
0
0
1
1
1
0
1
0
0
0
0
0
0
0
0
ni
0
LED select
0
0
1
1
1
0
1
1
0
0
0
0
0
0
0
1
0
0
1
1
1
0
1
1
1
0
0
0
0
0
0
1
1
1
0
1
1
0
0
0
0
0
0
1
ch
1
1
Te
64 - 85
LED Mapping
Instructions
Bit
[13]
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Compiler
Command
LED Driver
Instructions
lv
Supported instruction set is listed in the tables below:
0
0
AS3661 1v0
AS3661 has three independent programmable execution engines. All the program execution engines have their own program memory block allocated by the user.
Note that in order to access program memory the operation mode needs to be load program, at least for one of the three program execution engines. Program
execution is clocked with 32 768Hz clock. This clock can be generated internally or external 32 kHz clock can be connected to CLK32K pin. Using external clock
enables synchronization of LED timing to the external clock signal.
Datasheet - D e t a i l e d D e s c r i p t i o n
www.austriamicrosystems.com
8.11 Instruction Set
Bit
[15]
Bit
[14]
Bit
[13]
Bit
[12]
Bit
[11]
Bit
[10]
Bit
[9]
Bit
[8]
Bit
[7]
Bit
[6]
Bit
[5]
Bit
[4]
Bit
[3]
Bit
[2]
Bit
[1]
Bit
[0]
mux_ld_prev
MLP
1
0
0
1
1
1
0
1
1
1
0
0
0
0
0
1
mux_ld_addr
MLA
1
0
0
1
1
1
1
1
0
mux_map_addr
MMA
1
0
0
1
1
1
1
1
1
Bit
[13]
Bit
[12]
Bit
[11]
Bit
[10]
Bit
[9]
Bit
[8]
Bit
[7]
Bit
[6]
Bit
[5]
Bit
[4]
0
0
0
0
0
0
0
0
0
0
Bit
[15]
Bit
[14]
rst
RST
0
0
1
BRN
1
0
2
BRV
1
0
Int
INT
1
1
end
END
1
1
trigger
TRG
1
1
jne
JNE
1
0
jl
JL
1
0
jge
JGE
1
0
je
JE
1
0
branch
branch
1
loop count
Bit
[0]
0
0
0
0
0
0
1
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
int
reset
0
0
0
0
0
0
0
0
0
0
0
E2
E1
1
ext.tr
ig
x
x
E3
0
0
1
0
0
0
0
1
0
1
0
0
1
1
0
0
0
1
1
1
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65 - 85
Te
Bit
[1]
0
ca
Revision 1.3
Note: x stands for ‘don’t care’
Bit
[2]
step number
step number
wait for trigger
1. This opcode is used with numerical operands.
2. This opcode is used with variables.
Bit
[3]
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Compiler
Command
lv
SRAM address 0-95
Table 73. Branch Instructions
Branch Instructions
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Compiler
Command
loop count
send a trigger
E2
E1
ext.tr
ig
X
X
Number of instructions to be
skipped if the operation returns
true
E3
variable1
0
variable2
AS3661 1v0
LED Mapping
Instructions
Datasheet - D e t a i l e d D e s c r i p t i o n
www.austriamicrosystems.com
Table 72. LED Mapping Instructions
Bit
[15]
Bit
[14]
Bit
[13]
Bit
[12]
ld
Bit
[9]
Bit
[8]
Bit
[7]
Bit
[6]
Bit
[5]
Bit
[4]
Bit
[3]
LD
1
0
0
1
0
0
8-bit value
ADN
1
0
0
1
0
1
8-bit value
2
ADV
1
0
0
1
1
1
1
SBN
1
0
0
1
1
0
2
SBV
1
0
0
1
1
1
1. This opcode is used with numerical operands.
2. This opcode is used with variables.
66 - 85
ch
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Revision 1.3
Te
0
0
0
0
Bit
[1]
Bit
[0]
variable1
variable2
lv
target
variable
Bit
[2]
8-bit value
0
0
0
1
variable1
variable2
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add
sub
Bit
[10]
1
add
sub
Bit
[11]
al
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Compiler
Command
AS3661 1v0
Arithmetic
Instructions
Datasheet - D e t a i l e d D e s c r i p t i o n
www.austriamicrosystems.com
Table 74. Data Transfer and Arithmetic Instructions
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
8.12 LED Driver Instructions
8.12.1 RAMP (Numerical Operands)
lv
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This is the instruction useful for smoothly changing from one PWM value into another PWM value on the LED1 to
LED9 outputs, in other words generating ramps (with a negative or positive slope). AS3661 allows programming very
fast and very slow ramps. Ramp instruction generates a PWM ramp, using the effective PWM value as a starting value.
At each ramp step the output is incremented /decremented by one unit, unless the step time span is 0 or # of
increments is 0. Time span for one ramp step is defined with prescale -bit [14] and step time -bits [13:9]. Prescale = 0
sets 0.49 ms cycle time and prescale = 1 sets 15.6 ms cycle time; so the minimum time span for one step is 0.49 ms
(prescale * step time span = 0.49ms x 1) and the maximum time span is 15.6 ms x 31 = 484ms/step If all the step time
bits [13:9] are set to zero, output value is incremented / decremented during one prescale on the whole. Number of
increment’s value defines how many steps will be taken during one ramp instruction: Increment maximum value is
255d, which corresponds increment from zero value to the maximum value. If PWM reaches minimum/maximum value
(0/255) during the ramp instruction, ramp instruction will be executed to the end regardless of saturation. This enables
ramp instruction to be used as a combined ramp & wait instruction. Ramp instruction is the wait instruction when the
increment bits [7:0] are set to zero.
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COMPILER COMMAND SYNTAX: RMP, prescale[1], step time[4], sign[1], number of increments[8];
Table 75. RMP Parameter Description
Name
prescale
step time
sign
# of increments
Value
Description
0
Divides master clock (32 768 Hz) by 16 = 2048 Hz -> 0.488 ms cycle time
1
Divides master clock (32 768 Hz) by 512 = 64 Hz -> 15.625 ms cycle time
0-31
One ramp increment done in (step time) x (prescale).
0
Increase PWM output
1
Decrease PWM output
0-255
The number of increment/decrement cycles. Note: Value 0 takes the same
time as increment by 1, but it is the wait instruction.
8.12.1.1 RMP Application Example
Let's say that the LED dimming is controlled according to the linear scale and effective PWM value at the moment t=0
is 140d (~55%,), as shown in the figure below, and we want to reach a PWM value of 148d (~58%) at the moment t =
1.5s. The parameters for the RAMP instruction will be:
Prescale = 1 (15.625 ms cycle time)
Step time = 12 (step time span will be 12*15.625 ms = 187.5 ms)
Sign = 0 (increase PWM output)
Number of increments = 8 (take 8 steps)
ca
Te
ch
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COMPILER COMMAND SYNTAX EXAMPLE: RMP, 1, 12, 0, 8;
www.austriamicrosystems.com
Revision 1.3
67 - 85
AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
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Figure 29. RAMP Instruction Example
8.12.2 RAMP (Variables)
Programming ramps with variables is very similar to programming ramps with numerical operands. The only difference
is that step time and number of increments are captured from variable registers, when the instruction execution is
started. If the variables are updated after starting the instruction execution, it will have no effect on instruction
execution. Again, at each ramp step the output is incremented/decremented by one unless step time is 0 or increment
is 0. Time span for one step is defined with prescale and step time bits. Step time is defined with variable A, B, C or D.
Variables A, B and C are set with ld-instruction. Variable D is a global variable and can be set by writing the VARIABLE
register (address 0x3C). LED TEST ADC register (address 0x42) can be used as a source for the variable D, as well.
Note: Variable A is the only local variable which can be read throughout the serial bus. Of course, the variable stored in
3CH can be read (and written), too. Setting register 0x06, 0x07, or 0x08 bit LOG_EN high/low sets logarithmic (1) or
linear ramp (0). By using the logarithmic ramp setting the visual effect appears like a linear ramp, because the human
eye behaves in a logarithmic way.
COMPILER COMMAND SYNTAX: RWV, prescale[1], sign[1], step time[2], number of increments[2];
Table 76. RWV Parameter Description
Name
Description
0
Divides master clock (32 768 Hz) by 16 = 2048 Hz -> 0.488 ms cycle time
1
Divides master clock (32 768 Hz) by 512 = 64 Hz -> 15.625 ms cycle time
0
Increase PWM output
1
Decrease PWM output
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prescale
Value
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sign
0-3
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step time
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One ramp increment done in (step time) x (prescale).
Step time is loaded with the value (5 LSB bits) of the variable defined below.
1
local variable A
2
local variable B
3
local variable C
4
register address 3CH variable D value, or register address 42H
value.
The value of the variable should be from 00001b to 11111b (1d to 31d) for
correct operation.
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Table 76. RWV Parameter Description
Name
Value
Description
The number of increment/decrement cycles. Value is taken from variable
defined below:
0-3
local variable A
1
local variable B
2
local variable C
3
register address 0x3C variable D value, or register address 0x42
value.
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# of increments
0
8.12.2.1 RWV Application Example
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Let's say that the LED dimming is controlled according to the linear scale and effective PWM value at the moment t=0
is 0d (0%,) and we want to reach a PWM value of 255d (100%) at the moment t = 3s. The parameters for the RAMP
instruction will be:
Prescale = 0 (0.488 ms cycle time)
Step time = 4 (use variable D in register 0x3C with a value of 24d)
Sign = 0 (increase PWM output)
Number of increments = 0 (use local variable A which must be loaded with the value 255d)
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COMPILER COMMAND SYNTAX EXAMPLE: RMP, 0, 0, 4, 0;
The example above gives us a ramp time of 2.987s (tr = 0.488ms * 24 * 255).
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Figure 30. Ramp Instruction Example with Variables
8.12.3 SET PWM (Numerical Operands)
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This instruction is used for setting the PWM value on the outputs LED1 to LED9 without any ramps. Set PWM output
value from 0 to 255 with PWM value bits [7:0]. Instruction execution takes sixteen 32 kHz clock cycles (=488µs) .
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COMPILER COMMAND SYNTAX: SPW, PWM Value[8];
Table 77. SPW Parameter Description
Name
Value
Description
PWM Value
0-255
PWM output duty cycle 0 - 100%
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8.12.3.1 SPW Application Example
The SPW command can be used to set the PWM duty cycle of the program execution engine. In the following example
we want to set the duty cycle of the PWM output to 55% like in the ramp example in the previous section. The right
PWM value can be calculated with the following formula:
PWM value = (Duty Cycle * 255 / 100) = 55% * 255 / 100 = 140.
The predefined PWM value can be used as a starting point for dimming LEDs for example.
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COMPILER COMMAND SYNTAX: SPW, 140;
8.12.4 SET PWM (Variables)
COMPILER COMMAND SYNTAX: SPV, Variable[2];
Table 78. SPW Parameter Description
Value
Variable
Description
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Name
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This instruction is used for setting the PWM value on the outputs LED1 to LED9 without any ramps. In comparison to
the SPW command, this command is in combination with variables similar to the RWM example in one of the previous
sections.
0-3
0
local variable A
1
local variable B
2
global variable C
3
register address 3CH variable D value, or register address 42H value.
8.12.4.1 SPV Application Example
The purpose of the SPV command is basically the same one like with the SPW command in the previous section. The
only difference is that this command allows the user the control the PWM duty cycle with the variables of the chip.
COMPILER COMMAND SYNTAX EXAMPLE: SPW, 0;
The example above shows the control of the duty cycle with the local variable A. If the local variable is for example
loaded with a value of 100, the duty cycle of the PWM output is set to 39.2%.
8.12.5 WAIT
When a wait instruction is executed, the engine is set in a wait status and the PWM values on the outputs are frozen.
This can be used for example to keep the LEDs enabled for a certain period of time before another up/down dimming
process is being initiated.
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COMPILER COMMAND SYNTAX: WAIT, prescale[1], time[5];
Table 79. WAIT Parameter Description
Pre-scale
Description
0
Divide master clock (32 768 Hz) by 16 which means 0.488 ms cycle time.
1
Divide master clock (32 768 Hz) by 512 which means 15.625 ms cycle time.
1-31
Total wait time will be = (time) x (prescale). Maximum 484 ms, minimum 0.488 ms.
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time
Value
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Name
8.12.5.1 WAIT Application Example
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In the example shown below we want to have a target wait time of 125ms after dimming up the LEDs. In order to get
the 100ms delay we select a prescaler value “1”, which gives a cycle time of 15.625ms. If we divide the 100ms by the
cycle time we get the right value for the time parameter which is 8.
COMPILER COMMAND SYNTAX EXAMPLE: WAIT, 1, 8;
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8.13 LED Mapping Instructions
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These instructions define the engine-to-LED mapping. The mapping information is stored in a table, which is stored in
the SRAM (program memory of the AS3661). AS3661 has three program execution engines which can be mapped to
9 LED drivers or to one GPO pin. One engine can control one or multiple LED drivers. The first part of the program
memory of AS3661is usually used for LED driver programs of each sequencer. The LED mapping is usually put at the
end of the program memory where the programmable multiplexer, shown in the block diagram below, gets the
information which LED must be connected to what sequencer output.
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Figure 31. LED Mapping Memory allocation
In order to control and define the mapping of the LEDs there are totally eleven instructions for the engine-to-LED-driver
control: mux_ld_start, mux_map_start, mux_ld_end, mux_sel, mux_clr, mux_map_next, mux_map_prev, mux_ld_next,
mux_ld_prev, mux_ld_addr and mux_map_addr. With these instructions it is also possible to change the LED mapping
from one mapping to another mapping, which has been defined in the LED mapping table, forth and back to create
again more complex light patterns.
8.13.1 MUX_LD_START
Mux_ld_start defines the start of the mapping table location in the memory.
COMPILER COMMAND SYNTAX: MLS, SRAM address[7];
Table 80. MLS Parameter Description
SRAM address
Value
Description
0-95
Mapping table start address
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Name
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8.13.1.1 MLS Application Example
In this example we want to set the start address for the LED mapping table to 80d.
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COMPILER COMMAND SYNTAX EXAMPLE: MLS, 80;
8.13.2 MUX_LD_END
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Mux_ld_end defines the end of the mapping table location in the memory. It is very important to define the end address
of the mapping table, otherwise it could happen if you use relative mapping commands, that the address pointer points
to a position outside the mapping table due to the missing end address.
COMPILER COMMAND SYNTAX: MLE, SRAM address[7];
Table 81. MLE Parameter Description
Name
Value
Description
SRAM address
0-95
Mapping table end address
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8.13.2.1 MLE Application Example
In this example we want to set the end address for the LED mapping table to 85d.
COMPILER COMMAND SYNTAX EXAMPLE: MLE, 85;
8.13.3 MUX_MAP_START
COMPILER COMMAND SYNTAX: MMP, SRAM address[7];
Table 82. MMP Parameter Description
Value
Description
SRAM address
0-95
Mapping table start address
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Name
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Mux_map_start defines the mapping table start address in the memory and the first row of the table will be activated
(mapped) at the same time.
8.13.3.1 MMP Application Example
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In the example we would like to set the start address to 80d. In addition to the definition of the start address of the
mapping table the first LED mapping defined at address 80d gets activated. The difference to the MUSX_LD_START
command, described in one of the previous sections, is that it only defines the start address without activating the LED
mapping.
COMPILER COMMAND SYNTAX EXAMPLE: MMP, 80;
8.13.4 MUX_SEL
With mux_sel instruction one, and only one, LED driver (or the GPO-pin) can be connected to a program execution
engine. Connecting multiple LEDs to one engine is done with the mapping table. After the mapping has been released
from an LED, PWM register value will still control the LED brightness. If the mapping is released from the GPO pin,
serial bus control takes over the GPO state.
COMPILER COMMAND SYNTAX: MSL, LED Select[6]
Table 83. MSL Parameter Description
Name
Value
0-16
0
no drivers selected
1
LED1 selected
2
LED2 selected
....
....
16
GPO
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LED Select
Description
8.13.4.1 MSL Application Example
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In this example we would like to use the MSL command to map a single LED to a execution engine. Usually we do this
with the mapping table but in case we want to use only a single LED on one sequencer it is possible to use the MSL
command. The example command below shows the mapping of LED2 to the program execution engine.
ch
COMPILER COMMAND SYNTAX EXAMPLE: MSL, 2;
8.13.5 MUX_CLR
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Mux_clr clears engine-to-driver mapping. After the mapping has been released from an LED, PWM register value will
still control the LED brightness. If the mapping is released from the GPO pin, serial bus control takes over the GPO
state.
COMPILER COMMAND SYNTAX: MCL;
This command doesn’t support any parameters.
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8.13.6 MUX_MAP_NEXT
This instruction sets the next row active in the mapping table each time it is called. For example, if the 1st row is active
at this moment, after mux_map_next instruction call the 2rd row will be active like in the block diagram shown in
Figure 32 below.
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Figure 32. MUX_MAP_NEXT Command
If the mapping table end address is reached, activation will roll to the mapping table start address next time when the
mux_map_next instruction is called. Engine will not push a new PWM value to the LED driver output before set_pwm
or ramp instruction is executed. If the mapping has been released from an LED, the value in the PWM register will still
control the LED brightness. If the mapping is released from the GPO pin, serial bus control takes over the GPO state.
COMPILER COMMAND SYNTAX: MMN;
This command doesn’t support any parameters.
8.13.7 MUX_MAP_PREV
This instruction sets the previous row active in the mapping table each time it is called. For example, if the 3rd row is
active at this moment, after mux_map_prev instruction call the 2nd row will be active like in block diagram shown in
Figure 33 below.
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Figure 33. MUX_MAP_PREV Command
Figure 34.
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If the mapping table start address is reached, activation will roll to the mapping table end address next time the
mux_map_prev instruction is called. Engine will not push a new PWM value to the LED driver output before set_pwm
or ramp instruction is executed. If the mapping has been released from an LED, the value in the PWM register will still
control the LED brightness. If the mapping is released from the GPO pin, serial bus control takes over the GPO state.
COMPILER COMMAND SYNTAX: MMP;
This command doesn’t support any parameters.
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8.13.8 MUX_LD_NEXT
Similar than the mux_map_next instruction, but only the index pointer will be set to point to the next row i.e. no
mapping will be set and the engine-to-LED-driver connection will not be updated.
COMPILER COMMAND SYNTAX: MLN;
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This command doesn’t support any parameters.
8.13.9 MUX_LD_PREV
Similar than the mux_map_prev instruction, but only the index pointer will be set to point to the previous row i.e. no
mapping will be set and the engine-to-LED-driver connection will not be updated.
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COMPILER COMMAND SYNTAX: MLP;
This command doesn’t support any parameters.
8.13.10 MUX_MAP_ADDR
Mux_map_addr sets the index pointer to point the mapping table row defined by bits [6:0] and sets the row active.
Engine will not push a new PWM value to the LED driver output before set_pwm or ramp instruction is executed. If the
mapping has been released from an LED, the value in the PWM register will still control the LED brightness. If the
mapping is released from the GPO pin, serial bus control takes over the GPO state
COMPILER COMMAND SYNTAX: MMA, SRAM address[7];.
Table 84. MMA Parameter Description
Name
SRAM address
Value
Description
0-95
Any SRAM address containing mapping data.
8.13.10.1 MMA Application Example
In this example we asume the we have aleady defined the start and end address of the LED mapping table. Now we
want to set address 83d within the address range of the map table active.
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COMPILER COMMAND SYNTAX EXAMPLE: MMA, 83;
8.13.11 MUX_LD_ADDR
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Mux_ld_addr sets the index pointer to point the mapping table row defined by bits [6:0], but the row will not be set
active.
COMPILER COMMAND SYNTAX: MLA, SRAM address;
Table 85. MLA Parameter Description
Value
Description
0-95
Any SRAM address containing mapping data.
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Name
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SRAM address
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8.14 Branch Instructions
8.14.1 RST
RST instruction resets Program Counter register (address 37H, 38H, or 39H) and continues executing the program
from the program start address defined in 4C-4E. Instruction takes sixteen 32 kHz clock cycles.
COMPILER COMMAND SYNTAX: RST;
Note: The default value for all program memory registers is 0000H, which is the RST instruction.
8.14.2 BRANCH (Numerical)
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This command doesn’t support any parameters.
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Branch instruction is mainly indented for repeating a portion of the program code several times. Branch instruction
loads step number value to program counter. Loop count parameter defines how many times the instructions inside the
loop are repeated. AS3661 supports nested looping i.e. loop inside loop. The number of nested loops is not limited.
Instruction takes sixteen 32 kHz clock cycles.
COMPILER COMMAND SYNTAX: BRN, loop count[6], step number[7];
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Table 86. BRN Parameter Description
Name
Accepted Value
Description
loop count
0-63
The number of loops to be done. 0 means an infinite loop
0-95
The step number to be loaded to program counter
step number
8.14.2.1 BRN Application Example
In this application example we would like to create an infinite loop, which means the loop will never stop. The code we
want to repeat has a start address of 10d. At the end of the code we want to repeat we put the BRN command with the
program counter address 10d. Once the program execution engine executes the BRN command the program counter
jumps back to address 10d and starts executing the code from this address until it reaches again the BRN command.
COMPILER COMMAND SYNTAX: EXAMPLE: BRN, 0, 10;
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Figure 35. BRN Example for execution engine 1
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8.14.3 BRANCH (Variables)
The BRANCH command for variables has basically the same functionality like the numerical command. The only
difference is that the loop count is controlled with variables instead of having a fixed number.
COMPILER COMMAND SYNTAX: BRV, step number[7], loop count[2];
Table 87. BRN Parameter Description
Accepted Value
Description
step number
0-95
The step number to be loaded to program counter
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Name
Selects the variable for step number value. Step number is loaded with the
value of the variable defined below
0
local variable A
1
local variable B
2
local variable C
3
register address 3CH variable D value, or register address 42H value
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0-3
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loop count
8.14.4 INT
Send interrupt to processor by pulling the INT pin down and setting corresponding status bit high. Interrupt can be
cleared by reading interrupt bits in STATUS/INTERRUPT register at address 3A.
COMPILER COMMAND SYNTAX: INT;
This command doesn’t support any parameters.
8.14.5 END
End program execution. Instruction takes sixteen 32 kHz clock cycles.
COMPILER COMMAND SYNTAX: END, int[1], Reset[1];
Table 88. END Parameter Description
Name Value
Description
0
0
Reset program counter value to 0 and hold. PWM register values will remain intact.
1
Reset program counter value to 0 and hold. PWM register values of the non-mapped drivers will
remain. PWM register values of the mapped drivers will be set to "0000 0000". On completion of int
instruction with this bit set to "1" the master fader registers are set to zero as follows: Program
execution engine 1 sets MASTER FADER 1 (48H) to zero, engine 2 sets MASTER FADER 2 (49H) to
zero and engine 3 sets MASTER FADER 3 (4AH) to zero.
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Reset
1
Reset program counter value to 0 and send interrupt to processor by pulling the INT pin down and
setting corresponding status bit high to notify that program has ended. PWM register values will
remain intact. Interrupt can be cleared by reading interrupt bits in STATUS/INTERRUPT register at
address 3A.
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int
No interrupt will be sent. PWM register values will remain intact.
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8.14.5.1 END Application Example
The example code below sends an interrupt to the processor and resets the program counts to 0. The program
execution engine is set on hold.
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COMPILER COMMAND SYNTAX EXAMPLE: END, 1, 0;
8.14.6 TRIGGER
Wait or send triggers can be used to e.g. synchronize operation between the program execution engines. Send trigger
instruction takes sixteen 32 kHz clock cycles and wait for trigger takes at least sixteen 32 kHz clock cycles. The
receiving engine stores the triggers which have been sent. Received triggers are cleared by wait for trigger instruction.
Wait for trigger instruction is executed until all the defined triggers have been received (note: several triggers can be
defined in the same instruction).
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External trigger input signal must stay low for at least two 32 kHz clock cycles to be executed. Trigger output signal is
three 32 kHz clock cycles long. External trigger signal is active low, i.e. when trigger is send/received the pin is pulled
to GND. Sent external trigger is masked, i.e. the device which has sent the trigger will not recognize it. If send and wait
external trigger are used on the same instruction, the send external trigger is executed first, then the wait external
trigger.
COMPILER COMMAND SYNTAX: TRG, wait for trigger[6], send a trigger[6]
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Table 89. TRG Parameter Description
Value
Description
wait for trigger
0-31
Wait for trigger from the engine(s). Several triggers can be defined in the
same instruction. Bit [7] engages engine 1, bit [8] engine 2, bit [9] engine 3
and bit [12] is for external trigger I/O. Bits [10] and [11] are not in use.
send a trigger
0-31
Send a trigger to the engine(s). Several triggers can be defined in the same
instruction. Bit [1] engages engine 1, bit [2] engine 2, bit [3] engine 3 and bit
[6] is for external trigger I/O. Bits [4] and [5] are not in use.
8.14.6.1 TRG Application Example
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In this example we want to wait/receive a trigger from program execution engine 1.
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COMPILER COMMAND SYNTAX EXAMPLE: TRG, 2, 0;
8.14.7 JNE/JL/JGE/JE
AS3661 instruction set includes the following conditional jump instructions: jne (jump if not equal); jge (jump if greater
or equal); jl (jump if less); je (jump if equal). If the condition is true a certain number of instructions will be skipped (i.e.
the program jumps forward to a location relative to the present location). If condition is false then the next instruction
will be executed.
COMPILER COMMAND SYNTAX: JNE, number of instructions...[5], Variable1[2], Variable2[2];
COMPILER COMMAND SYNTAX: JL, number of instructions...[5], Variable1[2], Variable2[2];
COMPILER COMMAND SYNTAX: JGE, number of instructions...[5], Variable1[2], Variable2[2];
COMPILER COMMAND SYNTAX: JE, number of instructions...[5], Variable1[2], Variable2[2];
Table 90. JNE/JL/JGE/JE Parameter Description
Name
0-31
The number of instructions to be skipped when the statement is true.
Note: value 0 means redundant code.
0-3
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Variable1
Description
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number of instructions to be
skipped if the operation
returns true.
Value
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Variable2
0-3
Defines the variable to be used in the test:
0
local variable A
1
local variable B
2
global variable
C3
register address 3CH variable, or register address 42H value
Defines the variable to be used in the test:
0
local variable A
1
local variable B
2
global variable
C3
register address 3CH variable, or register address 42H value
8.14.7.1 JNE Application Example
In the following example we compare local variable A with local variable B. If the value of the two registers is not equal
the command will skip three instructions.
COMPILER COMMAND SYNTAX EXAMPLE: JNE, 3, 0,1;
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8.15 Arithmetic Instructions
8.15.1 LD
This instruction is used to assign a value into a variable; the previous value in that variable is overwritten. Each of the
engines have two local variables, called A and B. The variable C is a global variable which is shared with all three
program execution engines.
Name
Value
Target Variable
0-2
8-bit value
Description
0
variable A
1
variable B
2
variable C
0-255
variable value
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8.15.1.1 LD Application Example
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Table 91. LD Parameter Description
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COMPILER COMMAND SYNTAX: LD, Target Variable[2];
In this example we want to load variable B with a value of 100;
COMPILER COMMAND SYNTAX EXAMPLE: LD, 1, 100;
8.15.2 ADD (Numerical Operands)
Operator either adds the 8-bit value to the current value of the target variable.
COMPILER COMMAND SYNTAX: ADN, Target Variable,[2], 8-Bit value[8];
Table 92. ADN Parameter Description
Name
8-bit value
Target Variable
Description
0-255
Variable value
0-2
0-3
0
variable A
1
variable B
2
variable C
0
local variable A
1
local variable B
2
global variable
C3
register address 3CH variable, or register address 42H value
0
local variable A
1
local variable B
2
global variable
C3
register address 3CH variable, or register address 42H value
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Variable1
Value
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Variable2
0-3
8.15.2.1 ADN Application Example
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In this example we would like to add a value of100 d to variable ‘A’, which is loaded with a value of 10d. The result of
the operation is 110d stored in variable ‘A’.
COMPILER COMMAND SYNTAX EXAMPLE: ADN, 0, 100;
8.15.3 ADD (Variables)
This command adds the value of the variable 1 (A, B, C or D) to the value of the variable 2 (A, B, C or D) and stores the
result in the register of variable A, B or C which is defined as target variable. Variables overflow from 255 to 0.
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COMPILER COMMAND SYNTAX: ADV, Target Variable[2], Variable1[2], Variable2[2];
Table 93. ADV Parameter Description
Value
0-2
Variable1
0-3
0-3
variable A
1
variable B
2
variable C
0
local variable A
1
local variable B
2
global variable
C3
register address 3CH variable, or register address 42H value
0
local variable A
1
local variable B
2
global variable
C3
register address 3CH variable, or register address 42H value
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Variable2
0
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Target Variable
Description
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Name
8.15.3.1 ADV Application Example
In this example we want to add variable ‘A’ to variable ‘B’. The result should be stored in variable ‘C’.
COMPILER COMMAND SYNTAX EXAMPLE: ADV, 2, 0, 1;
8.15.4 SUB (Numerical)
SUB Operator either subtracts the 8-bit value from the current value of the target variable.
COMPILER COMMAND SYNTAX: SBN, Target Variable[2], 8-bit value[8];
Table 94. SBN Parameter Description
Name
8-bit value
Value
Description
0-255
variable value
0
0-2
1
variable B
2
variable C
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Target Variable
variable A
8.15.4.1 SBN Application Example
In this example we would like to subtract 50d from local variable ‘A’. The result is stored in variable ‘A’.
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COMPILER COMMAND SYNTAX EXAMPLE: SBN, 0, 50;
8.15.5 SUB (Variables)
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The SBV command subtracts the value of the variable 2 (A, B, C or D) from the value of the variable 1 (A, B, C or D)
and stores the result in the register of target variable (A, B or C). Variables overflow from 0 to 255.
COMPILER COMMAND SYNTAX: SBV, Target Variable[2], Variable1[2], Variable2[2];
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Table 95. SBV Parameter Description
Name
Target Variable
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Value
0-2
Description
0
variable A
1
variable B
2
variable C
Revision 1.3
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AS3661
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 95. SBV Parameter Description
Value
0-3
Variable2
0-3
0
local variable A
1
local variable B
2
global variable
C3
register address 3CH variable, or register address 42H value
0
local variable A
1
local variable B
2
global variable
C3
register address 3CH variable, or register address 42H value
8.15.5.1 SBV Application Example
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Variable1
Description
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Name
In this example we would like to subtract variable ‘A’ from variable ‘B’. The result should be stored in variable ‘C’.
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COMPILER COMMAND SYNTAX EXAMPLE: SBV, 2, 0, 1;
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Revision 1.3
80 - 85
Revision 1.3
D
C
B
1
CPU for I2C control
GND
C2
R1
10k
R2
10k
DIGITAL_IO
Battery
Terminal
2
Vbat
C3
1uF
C5
C4
470nF
C5
470nF
U1
AS3661
E5
SCL
GND
INT
B3
C3
E3
D4
D3
ENABLE C4
E4
SDA
GND
ASEL1
ASEL0
TRIG
CLK32K
INT
VEN
SCL
SDA
VDD
AS3661
GND
GPO
D9
D8
D7
D6
D5
D4
D3
D2
D1
CPOUT
LED8
LED9
D2
E1
3
GPO
LED7
LED6
LED5
LED4
LED3
LED2
D1
C2
C1
B2
B1
A2
A1
A3
LED1
3
GND
C6
1uF
VCP
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R3
10k
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A5
C2+
A4
C2-
DIGITAL_IO
C1+
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B5
GND
D5
A
2
B4
C1-
1
GPO
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E2
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4
GND
GND
GND
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D30
D29
D28
D27
D26
D25
D24
D23
D22
4
D
C
B
A
AS3661
Datasheet - Ty p i c a l A p p l i c a t i o n
9 Typical Application
Figure 36. Typical Application 3 RGB LEDs
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AS3661
Datasheet - Ty p i c a l A p p l i c a t i o n
9.1 Recommended External Components
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The AS3661 requires 4 external capacitors for proper operation. Surface-mount multi-layer ceramic capacitors are
recommended. Tantalum and aluminium capacitors are not recommended because of their high ESR. For the flying
capacitors (C1 and C2) multi-layer ceramic capacitors should always be used. These capacitors are small, inexpensive
and have very low equivalent series resistance (ESR <20mΩ typ.). Ceramic capacitors with X7R or X5R temperature
characteristic are preferred for use with the AS3661. These capacitors have tight capacitance tolerance (as good as
±10%) and hold their value over temperature (X7R: ±15% over -55° C to 125°C; X5R: ±15% over -55°C to 8 5°C).
Capacitors with Y5V or Z5U temperature characteristic are generally not recommended for use with the AS3661.
Capacitors with these temperature characteristics typically have wide capacitance tolerance (+80%, -20%) and vary
significantly over temperature (Y5V: +22%, -82% over -30°C to +85°C range; Z5U: +22%, -56% over +10°C to +85°C
range). Under some conditions, a nominal 1µF Y5V or Z5U capacitor could have a capacitance of only 0.1µF. Such
detrimental deviation is likely to cause Y5V and Z5U capacitors to fail to meet the minimum capacitance requirements
of the AS3661. For proper operation it is necessary to have at least 0.24 µF of effective capacitance for each of the
flying capacitors under all operating conditions. The output capacitor CVCPOUT directly affects the magnitude of the
output ripple voltage. In general, the higher the value of CVCPOUT, the lower the output ripples magnitude. For proper
operation it is recommended to have at least 0.50µF of effective capacitance for CVBAT and CVCPOUT under all
operating conditions. The voltage rating of all four capacitors should be 6.3V; 10V is recommended. Recommended
External Components below lists recommended external components from some leading ceramic capacitor
manufacturers. It is strongly recommended that the AS3661 circuit be thoroughly evaluated early in the design-in
process with the mass-production capacitors of choice. This will help ensure that any variability in capacitance does
not negatively impact circuit performance.
Figure 37. Recommended External Components
Model
1µF for CVBAT and CVCPOUT
C1005X5R1A105K
LMK105BJ105KV-F
ECJ0EB1A105M
ECJUVBPA105
470F for CFLY1 and CFLY2
C1005X5R1A474K
LMK105BJ474KV-F
ECJ0EB0J474K
Voltage Rating
Package Size
Ceramic X5R
Ceramic X5R
Ceramic X5R
Ceramic X5R, array
of two
TDK
10V
Taiyo Yuden 10V
Panasonic 10V
0402
0402
0402
Panasonic
0504
Ceramic X5R
Ceramic X5R
Ceramic X5R
TDK
10V
0402
Taiyo Yuden 10V
0402
Panasonic 6.3V
0402
User defined. Note that D7, D8 and D9 outputs are
powered from VBAT when specifying the LEDs.
10V
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LEDs
Vendor
Type
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Revision 1.3
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AS3661
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
Figure 38. WL-CSP-25 (2.285x2.285mm) 0.4mm pitch Marking
Top View (through)
1
2
3
4
Bottom View (Ball Side)
5
5
4
2
1
A
A
A
B
B
B
B
C
C
C
D
D
D
E
E
E
AS3661
<Code>
D
E
1
2
3
4
5
5
4
Note:
2
1
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austriamicrosystems logo
AS3661
<Code>
Encoded Datecode (4 characters)
3
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A
C
Line 1:
Line 2:
Line 3:
3
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Pin A1
Indicator
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Figure 39. WL-CSP-25 (2.285x2.285mm) 0.4mm pitch Package Dimensions
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Revision 1.3
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AS3661
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The devices are available as the standard products shown in Table 96.
Table 96. Ordering Information
Marking
Desciption
Delivery Form
AS3661-BWLT
AS3661
Programmable 9-channel LED Driver
Tape and Reel
Package
WL-CSP-25
(2.285x2.285mm)
0.4mm pitch
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Ordering Code
Note: All products are RoHS compliant and austriamicrosystems green.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
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Technical Support is found at http://www.austriamicrosystems.com/Technical-Support
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For further information and requests, please contact us mailto:[email protected]
or find your local distributor at http://www.austriamicrosystems.com/distributor
www.austriamicrosystems.com
Revision 1.3
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AS3661
Datasheet - O r d e r i n g I n f o r m a t i o n
Copyrights
Copyright © 1997-2012, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
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Disclaimer
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Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement.
austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice.
Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for
current information. This product is intended for use in normal commercial applications. Applications requiring
extended temperature range, unusual environmental requirements, or high reliability applications, such as military,
medical life-support or life-sustaining equipment are specifically not recommended without additional processing by
austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show
deviations from the standard production flow, such as test flow or test location.
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The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to
personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the
technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
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Contact Information
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Headquarters
austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
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Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
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Revision 1.3
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Authorized Distributor
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AS3661-BWLT AS3661-BWLT-500