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Datasheet
AS3642
Ultra Small 500mA Inductive White LED Flash Driver
1 General Description
2 Key Features
Total
The AS3642 is an inductive high efficient DCDC step up
converter driving a current source. The DCDC step up
converter operates at a fixed frequency of 4MHz and
includes soft startup to allow easy integration into noise
sensitive RF systems. The current source operates in
flash/torch/assist (video/autofocus) and indicator mode.
efficiency 4MHz fixed frequency DCDC Boost
converter with soft start allows small coils
currents
Up to 500mA flash current (15.6mA steps)
Up to 320mA torch current (10mA steps)
1.35mA,2.9mA,4.4mA or 6mA indicator light current
(PWM with 1...4/32 duty cycle)
Flash
LED(s) cathode connected to ground:
Improved thermal performance (ground = heat sink)
Simplified PCB layout
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Adjustable
Flash Timer
30ms to 480ms in 30ms steps
Flash,
2
The AS3642 is controlled by an I C interface to allow
sophisticated control of all settings like currents and timings.
Torch, Assist and Indicator Mode
Protection
functions:
Automatic Flash timer to protect the LED
Overvoltage and undervoltage Protection
Overtemperature Protection
LED short circuit protection
The complete flash driver solution measures only
Available
in tiny WL-CSP Packages
2x3 balls 0.5mm pitch, 1.5x1.1x0.6mm package size
The AS3642 is available in a space-saving WL-CSP
package measuring only 1.5x1.1x0.6mm and operates
over the -30ºC to +85ºC temperature range.
3 Applications
Figure 1. Typical Operating Circuit
Flash/Torch for mobile phones, digital cameras and PDA
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The AS3642 is able to detect a broken coil. Together
with the LED short and open detection the AS3642 can
be used to verify the connection to its external components and allowing in-circuit test. This reduces test time
and simplifies production test procedures.
2
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High
The AS3642 includes flash timer, overvoltage, overtemperature, undervoltage and LED short circuit protection
functions.
11mm PCB area.
2
flash driver solution only 11mm
AS3642
"
1.2-2
1 - 26
AS3642
Datasheet - P i n o u t
4 Pinout
Pin Assignment
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Figure 2. Pin Assignments (Top View)
AS3642
AS3642
Pin Description
Table 1. Pin Description for AS3642
Pin Number
Pin Name
A1
SW
DCDC converter switching node - make a short connection to the coil LDCDC
GND
Power and signal ground - connect to GND and make a short connection to
CVOUT
A2
B1
LED_OUT
B2
VOUT
C1
Flash LED current source output
DCDC converter output capacitor and supply for AS3642 - make a short
connection to CVOUT
2
SCL
serial clock input in I C interface
SDA
serial data input/output for I C interface (needs external pullup resistor)
2
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C2
Description
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1.2-2
2 - 26
AS3642
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 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 2. Absolute Maximum Ratings
Min
Max
Units
VOUT, SW to GND
-0.3
+7.0
V
SCL, SDA, LED_OUT to GND
-0.3
VOUT+
0.3
V
max. +7V
VOUT to SW
-0.3
V
Note: Diode between VOUT and SW
Input Pin Current without causing latchup
-100
+100
+IIN
mA
Norm: EIA/JESD78
Continuous power dissipation
530
mW
PT at 70ºC ambient
Continuous power dissipation derating factor
7.2
mW/ºC
PDERATE
±2000
V
Norm: JEDEC JESD22-A114F
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1
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Continuous Power Dissipation (TA = +70ºC)
Comments
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Parameter
2
Electrostatic Discharge
ESD HBM
ESD CDM
±500
V
Norm: JEDEC JESD 22-C101C
ESD MM
±100
V
Norm: JEDEC JESD 22-A115-A level A
+150
ºC
Internally limited (overtemperature
protection) max. 20000s
Temperature Ranges and Storage Conditions
Junction Temperature
Storage Temperature Range
-55
+125
ºC
Humidity
5
85
%
Non condensing
+260
ºC
according to IPC/JEDEC J-STD-020
Body Temperature during Soldering
Moisture Sensitivity Level (MSL)
Represents a max. floor life time of
unlimited
MSL 1
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1. Depending on actual PCB layout and PCB used; for peak power dissipation during flashing see document
'AS3642 Thermal Measurements'
2. PDERATE derating factor changes the total continuous power dissipation (PT) if the ambient temperature is not
70ºC. Therefore for e.g. TAMB=85ºC calculate PT at 85ºC = PT - PDERATE * (85ºC - 70ºC)
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1.2-2
3 - 26
AS3642
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
VVIN = +2.7V to +5.5V, TAMB = -30ºC to +85ºC, unless otherwise specified. Typical values are at VVIN = +3.7V, TAMB =
+25ºC, unless otherwise specified.
Table 3. Electrical Characteristics
Symbol
Parameter
Condition
Min
Typ
2.7
3.7
Max
Unit
Supply Voltage
VVINREDUCE
Supply Voltage
AS3642 functionally working, but not all
1
parameters fulfilled
ISHUTDOWN
Shutdown Current
SCL=L, SDA=L, VVIN<3.7V,
0ºC < TAMB < 50ºC
ISTANBY
Standby Current
interface active, VVIN<3.7V
TAMB
Operating
Temperature
D_FUNC
2.5
0.5
-30
VVOUT
DCDC Boost output
Voltage (pin VOUT)
Eta
Efficiency
ILED_OUT
LED_OUT current
source output
ILED_OUT
LED_OUT current
source accuracy
ILED_OUT
LED_OUT ramp time
at ILED_OUT=300mA
RAMP
For high supply voltages the output voltage can
reach up to VVOUTMAX (the AS3642 always
runs in PWM mode unless VVOUT>VVOUTMAX
or during startup)
5.0
V
1.0
µA
0.5
5
µA
25
85
ºC
2.8
ILED_OUT=300mA,VVOUT=4.2V
Operating Frequency
Current Source
V
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DCDC Step Up Converter
fCLK
4.5
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VVIN
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General Operating Conditions
4.7
82
All internal timings are derived from this
oscillator
-7.5%
4.0
+7.5%
DCDC operating frequency for short pulses
(close to 100% operating mode)
-7.5%
1.0
+7.5%
V
%
MHz
0
500
mA
ILED_OUT=300mA
-7
+7
%
Ramp-up During startup
0.6
1.0
ms
Ramp-down after AS3642 is disabled by
interface
0.2
0.7
ms
LED_OUT current
ripple
ILED_OUT = 300mA
10
VILED_COMP
LED_OUT current
source voltage
compliance
Minimum voltage between pin VOUT and
LED_OUT for operation of the current source
(applicable for current_mode=00, 01 and10)
210
350
mV
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ILED_OUT
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RIPPLE
mAPP
Protection and Fault Detection Functions (see page 10)
VVOUT overvoltage
protection
DCDC Converter Overvoltage Protection
5.0
5.25
5.5
V
Current Limit for coil
LDCDC (Pin SW)
measured at 50%
2
PWM duty cycle
maximum 40000s lifetime operation in
overcurrent limit
0.7
0.8
0.9
A
Flash LED short
circuit detection
voltage
Voltage measured on pin LED_OUT
1.45
1.65
V
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VVOUTMAX
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ILIMIT
VLEDSHORT
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1.2-2
4 - 26
AS3642
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
TOVTEMP
Overtemperature
Protection
TOVTEMPHY
Condition
ST
Overtemperature
Hysteresis
tFLASHTIMER
Flash Timer
VUVLO
Undervoltage
3
Lockout
Min
Typ
Can be adjusted by register flash_timer (see
page 18)
-7.5%
Falling VVIN
2.3
Rising VVIN
144
ºC
5
ºC
30 to +7.5%
480
2.4
VOL
Low Level Output
Voltage
2
2.5
V
VUVLO VUVLO VUVLO
+0.05 +0.1 +0.15
V
1.26
VVIN0.2
V
0.0
0.54
V
4
Pins SCL, SDA
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Low Level Input
Voltage
ms
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High Level Input
Voltage
VIL
Unit
Junction temperature
Digital Interface
VIH
Max
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Symbol
Pin SDA with pullup >1k to digital supply <2V,
VVIN>2.7V
0.3
V
I C interface timings - see Figure 3 on page 6
Minimum time from SDA or SCL going high to
2
first I C start command
tWAKEUP
Wakeup Time
tTIMEOUT
I C timeout time
fSCLK
SCL Clock Frequency
2
500
In flash, assist light and indicator mode if SCL
and SDA are L for tTIMEOUT, the AS3642 enters
automatically shutdown mode
35
1/
tTIMEO
400
µs
ms
kHz
UT
Bus Free Time
Between a STOP and
START Condition
1.3
µs
tHD:STA
Hold Time (Repeated)
5
START Condition
0.6
µs
tLOW
LOW Period of SCL
Clock
1.3
µs
tHIGH
HIGH Period of SCL
Clock
0.6
µs
tSU:STA
Setup Time for a
Repeated START
Condition
0.6
µs
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Data Hold Time
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tBUF
7
0.9
µs
Data Setup Time
100
tR
Rise Time of Both
SDA and SCL Signals
20 +
0.1CB
300
ns
tF
Fall Time of Both SDA
and SCL Signals
20 +
0.1CB
300
ns
tSU:STO
Setup Time for STOP
Condition
0.6
CB
Capacitive Load for
Each Bus Line
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tSU:DAT
CB — total capacitance of one bus line in pF
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1.2-2
ns
µs
400
pF
5 - 26
AS3642
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)
Symbol
Parameter
CI/O
I/O Capacitance
(SDA, SCL)
Condition
Min
Typ
Max
Unit
10
pF
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1. Limited to max. 5V due to overvoltage protection circuit on pin VOUT
2. Due to slope compensation of the current limit, ILIMIT changes with duty cycle - see Figure 16 on page 9.
3. Due to the architecture (the supply of the AS3642 is connected to the output VOUT), the undervoltage lockout
is only detected when the DCDC converter is not switching
4. The logic input levels VIH and VIL allow for 1.8V supplied driving circuit (70%/30% of 1.8V)
5. After this period, the first clock pulse is generated.
6. 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.
7. 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.
Timing Diagrams
2
Figure 3. I C interface Timing Diagram
SDA
tBUF
tLOW
tR
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SCL
tHD:STA
tF
tHD:STA
ni
tHD:DAT
tHIGH
tSU:STA
tSU:STO
tSU:DAT
REPEATED
START
Te
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STOP START
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1.2-2
6 - 26
AS3642
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
VVIN = 3.7V, TA = +25ºC (unless otherwise specified)
Figure 4. DCDC Efficiency vs. VVIN
85
85
80
75
70
65
IOUT = 50mA
IOUT = 120mA
IOUT = 220mA
IOUT = 320mA
IOUT = 500mA
55
70
65
pulseskip is used
for currents above
320mA
60
55
IOUT = 50mA
IOUT = 120mA
IOUT = 220mA
IOUT = 320mA
IOUT = 500mA
50
3,9
2,7
4,3
Input Voltage (V)
1V/Div
VVIN,VLED_OUT,VOUT
IVIN
ca
100mA/Div
VVIN,VLED_OUT,VOUT
ILED_OUT
4,3
250µs/Div
1V/Div
20mA/Div
ILED_OUT
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ILED_OUT
VLED_OUT
Figure 9. VOUT / ILED_OUT ripple, ILED_OUT = 300mA
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Figure 8. ILED Startup (ILED_OUT=51.6mA)
VVIN,VLED_OUT,VOUT
3,9
Figure 7. IVIN Startup (ILED_OUT=300mA)
250µs/Div
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3,5
Input Voltage (V)
Figure 6. ILED Startup (ILED_OUT=300mA)
50µs/Div
www.austriamicrosystems.com/AS3642
3,1
1V/Div
3,5
100mA/Div
3,1
50mV/Div
2,7
20mA/Div
50
75
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80
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90
Efficiency PLED/PVIN (%)
95
DCDC Efficiency (%)
90
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Figure 5. Application Efficiency (PLED/PVIN) vs. VVIN
100
100ns/Div
1.2-2
7 - 26
AS3642
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. ILED Rampdown (ILED_OUT=300mA)
Figure 11. ILED_OUT Linearity of current sink
400
300
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ILED_OUT (mA)
IOUT = 50mA
IOUT = 120mA
IOUT = 220mA
IOUT = 320mA
IOUT = 500mA
200
100
0
0
250µs/Div
0,8
1,2
1,6
2
2,4
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VOUT-LED_OUT (V)
Figure 12. ILED_OUT vs. TAMB
321
0,4
lv
ILED_OUT
100mA/Div
1V/Div
VVIN,VLED_OUT,VOUT
500
Figure 13. Oscillator frequency fCLK vs. TAMB
4,00
Frequency (MHz)
ILED_OUT (mA)
3,98
320
319
3,96
3,94
3,92
10
30
50
3,90
-30
70
10
30
50
70
VLED_OUT, VOUT
Figure 15. DCDC fCLK change 4MHz->1MHz(51mA)
ISW
ISW
100mA/Div
1V/Div
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VLED_OUT, VOUT
Figure 14. DCDC fCLK change 4MHz->1MHz(300mA)
5µs/Div
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-10
Ambient Temperature (C)
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Ambient Temperature (C)
1V/Div
-10
50mA/Div
318
-30
5µs/Div
1.2-2
8 - 26
AS3642
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS3642 is a high performance DCDC step up converter with internal PMOS and NMOS switches. The switching
frequency of 4MHz allows the use of tiny coils. Its output is connected to a flash LED by an internal current source.
2
The AS3642 is controlled by an I C interface. All timings and currents can be accurately adjusted by this interface. It
support following operating modes:
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1. Flash mode (enabled by mode=11):
The LED current is defined by register flash_current. A timer defines the output flash duration (30ms...480ms
2
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in 30ms steps defined by register flash_timer). The flash is started immediately after the end of the I C command.
If SCL and SDA are L for more than tTIMEOUT, shutdown mode is automatically entered.
2. Assist light mode (=video or torch light mode) (enabled by mode=10):
The LED current is defined by register assist_current. The current is enabled until another mode is chosen by
the interface.
If SCL and SDA are L for more than tTIMEOUT, shutdown mode is automatically entered.
3. Indicator light mode (enabled by mode=01):
1
Internal Circuit
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The LED current is PWM modulated by 1/32, 2/32, 3/32 or 4/32 (defined by register ind_current resulting in a
effective current of 1.35mA / 2.9mA / 4.4mA or 6.0mA. The current is enabled until another mode is chosen by
the interface.
If SCL and SDA are L for more than tTIMEOUT, shutdown mode is automatically entered
4. Shutdown mode (mode=00), SCL=0V, SDA=0V:
The DCDC and the current source is disabled and the AS3642 is configured to draw minimum current.
The AS3642 includes a fixed frequency DCDC step-up with accurate startup control. Together with the output current
source (on LED_OUT) it includes protection and safety functions as shown in the following internal blockdiagram:
Figure 16. AS3642 internal circuit
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AS3642
1. The PWM modulation frequency is 31.25kHz to avoid audible noise on the external capacitors.
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1.2-2
9 - 26
AS3642
Datasheet - D e t a i l e d D e s c r i p t i o n
The DCDC converter always operates in PWM mode (exception: PFM mode is allowed during startup) to reduce EMI
in EMI sensitive systems. For flash and assist light mode and high duty cycles close to 100% on-time (maximum duty
cycle) of the PMOS, the DCDC converter can switch into a 1MHz operating mode and maximum duty cycle to improve
efficiency for this load condition. The DCDC converter returns back to its normal 4MHz operating frequency when load
or supply conditions change. Due to this switching between two fixed frequencies the noise spectrum of the system is
exactly defined and predictable. If improved efficiency is required, the fixed switching between 1MHz / 4MHz can be
2
The internal circuit for switching between these two frequencies is shown in Figure 17:
Figure 17. Internal circuit of 4MHz/1Mhz selection
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External Strobe Input
To start the flash operation by an hardware input using an external strobe input, use schematic shown in Figure 18:
Figure 18. External strobe input
AS3642
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To enable this function, program the flash timer with the exact flash duration (by programming flash_timer) and set
external_strobe=1. The AS3642 waits for an external strobe signal on pin LED_OUT and starts the flash pulse with a
duration defined by flash_timer.
2. If current_mode=11 (500mA operating mode), the AS3642 will always use only 4Mhz.
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1.2-2
10 - 26
AS3642
Datasheet - D e t a i l e d D e s c r i p t i o n
Protection and Fault Detection Functions
The protection functions protect the AS3642 and the LED(s) against physical damage. In most cases a register bit is
3
set, which can be readout with the interface. The fault bits are cleared by a readout of the fault register.
DCDC Overvoltage Protection
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In case of no or a broken LED at the pin LED_OUT and an enabled DCDC converter, the voltage on VOUT rises until
it reaches VVOUTMAX (overvoltage condition) and the voltage across the current source does not reach regulation
(VOUT-VLED < VILED_COMP). If this condition is detected, the DCDC converter is stopped, the current sources are dis4
abled and the bit fault_ovp (see page 19) is set.
DCDC Broken Coil Detection
2
lv
If the coil LDCDC is broken, the AS3642 is not powered by the pin SW connected to VOUT by the internal switch. Due
to the protection diodes between SCL to VOUT and SDA to VOUT, the AS3642 can be powered through these diodes.
The AS3642 detects this error condition by comparing the voltage on SCL and VOUT. If the voltage on VOUT is lower
am
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compared to the voltage on SCL, the AS3642 will ignore any I C write commands. Therefore the application can simply
detect this condition.
Note: Due to the broken coil detection, the high levels of SDA and SCL should be always below the supply voltage.
LED Short Circuit Protection
After the startup of the DCDC converter, the voltage on LED_OUT is continuously monitored and compared against
VLEDSHORT. If the voltage stays below VLEDSHORT, the DCDC is stopped (as a shorted LED is assumed), the current
sources are disabled and the bit fault_led_short (see page 19) is set.
Overtemperature Protection
The junction temperature of the AS3642 is continuously monitored. If the temperature exceeds TOVTEMP, the DCDC is
stopped, the current sources are disabled and the bit fault_overtemp (see page 19) is set. The driver cannot be reenabled unless the junction temperature drops below TOVTEMP-TOVTEMPHYST.
Flash Timer
The duration of the flash is defined by the register flash_timer (see page 18). After the timer expires, the DCDC is
stopped and the flash current source (on pin LED_OUT) is disabled.
Supply undervoltage Protection
If the voltage on the pin VOUT (=battery voltage) is or falls below VUVLO, the AS3642 is kept in shutdown state and in
all registers are set to their default state.
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Note: During operation of the DCDC converter, the supply undervoltage protection will still monitor the DCDC output
voltage only. Therefore the supply undervoltage protection will only monitor the battery voltage if the DCDC
converter is switched off and the output capacitor is discharged down to the supply voltage.
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Wakeup Circuit - Power off detection
Te
ch
In flash, assist light and indicator mode (register mode (page 18)=01, 10 or 11), if SCL and SDA are L for more than
tTIMEOUT, shutdown mode is automatically entered. This feature automatically detects a power-off of the controlling circuit driving SCL and SDA (VDD_I/F goes to 0V) - the internal circuit is shown in Figure 19:
3. Except overtemperature protection bit fault_overtemp: This bit can be cleared once the temperature drops
below TOVTEMP-TOVTEMPHYST.
4. In indicator mode (mode=01) the register fault_ovpi s never set (the overvoltage protection is nevertheless
operating)
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1.2-2
11 - 26
AS3642
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 19. Device Shutdown and Wakeup
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I2C Serial Data Bus
2
The AS3642 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 AS3642 operates as a slave on
2
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 AS3642 works in both modes. Connections to the bus are made through the
open-drain I/O lines SDA and SCL.
The following bus protocol has been defined (Figure 20):
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:
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Bus Not Busy
Both data and clock lines remain HIGH.
Start Data Transfer
ni
A change in the state of the data line, from HIGH to LOW, while the clock is HIGH, defines a START condition.
Stop Data Transfer
ch
A change in the state of the data line, from LOW to HIGH, while the clock line is HIGH, defines the STOP condition.
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.
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.
www.austriamicrosystems.com/AS3642
1.2-2
12 - 26
AS3642
Datasheet - D e t a i l e d D e s c r i p t i o n
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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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.
2
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Figure 20. Data Transfer on I C Serial Bus
SDA
MSB
SLAVE
ADDRESS
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R/W
DIRECTION
BIT
ACKNOWLEDGEMENT
SIGNAL FROM
RECEIVER
ACKNOWLEDGEMENT
SIGNAL FROM
RECEIVER
SCL
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 AS3642 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 21). The slave address byte is the first byte received after the master
generates the START condition. The slave address byte contains the 7-bit AS3642 address, which is 0110000,
5
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 AS3642 acknowledges the slave address +
write bit, the master transmits a register address to the AS3642. This sets the register pointer on the AS3642.
The master may then transmit zero or more bytes of data, with the AS3642 acknowledging each byte received.
5. The address for writing to the AS3642 is 60h = 01100000b
www.austriamicrosystems.com/AS3642
1.2-2
13 - 26
AS3642
Datasheet - D e t a i l e d D e s c r i p t i o n
The 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 AS3642 while the serial clock is input on SCL. START and STOP conditions are recognized
as the beginning and end of a serial transfer (Figure 22 and Figure 23). The slave address byte is the first byte
received after the master generates a START condition. The slave address byte contains the 7-bit AS3642
6
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address, which is 0110000, 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 AS3642 then
begins to transmit data starting with the register address pointed to by the register pointer. 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 AS3642 must receive a “not acknowledge” to end a read.
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0110000
<RW>
<Slave Address>
S
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Figure 21. Data Write - Slave Receiver Mode
0
A
<Word Address (n)>
<Data(n)>
XXXXXXXX
XXXXXXXX
A
S - Start
A - Acknowledge (ACK)
P - Stop
<Data(n+X)>
<Data(n+1)>
A
XXXXXXXX
A
XXXXXXXX
A
P
NA
P
Data Transferred
(X + 1 Bytes + Acknowledge)
<Slave Address>
0110000
1
<Data(n+1)>
<Data(n)>
A
XXXXXXXX
A
ca
S
<RW>
Figure 22. Data Read (from Current Pointer Location) - Slave Transmitter Mode
A
XXXXXXXX
A
XXXXXXXX
Data Transferred
(X + 1 Bytes + Acknowledge)
Note: Last data byte is followed by a NACK
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S - Start
A - Acknowledge (ACK)
P - Stop
NA - Not Acknowledge (NACK)
XXXXXXXX
<Data(n+X)>
<Data(n+2)>
6. The address for read mode from the AS3642 is 61h = 01100001b
www.austriamicrosystems.com/AS3642
1.2-2
14 - 26
AS3642
Datasheet - D e t a i l e d D e s c r i p t i o n
0
XXXXXXXX
A
XXXXXXXX
Sr
0110000
A
XXXXXXXX
1
A
<Data(n+X)>
A
XXXXXXXX
NA
Data Transferred
(X + 1 Bytes + Acknowledge)
Note: Last data byte is followed by a NACK
P
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S - Start
Sr - Repeated Start
A - Acknowledge (ACK)
P - Stop
NA - Not Acknowledge (NACK)
A
<Data(n+2)>
<Data(n+1)>
<Data(n)>
XXXXXXXX
A
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0110000
<Slave Address>
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S
<Word Address (n)>
<RW>
<RW>
Figure 23. Data Read (Write Pointer, Then Read) - Slave Receive and Transmit
www.austriamicrosystems.com/AS3642
1.2-2
15 - 26
AS3642
Datasheet - D e t a i l e d D e s c r i p t i o n
Register Description
Table 4. Design Info Register
Design Info Register
Addr: 0
This register has a fixed ID
Bit Name
7:0
fixed_id
Default Access
13h
Description
2
This is a fixed identification (e.g. to verify the I C
communication)
R
Table 5. Version Control Register
Version Control Register
Addr: 1
lv
This register defines design versions
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Bit
Bit Name
Default Access
Description
3:0
version
Xh
R
AS3642 version number
7:4
reserved
Xh
R
reserved - don’t use
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Bit
Table 6. Current Set Register
Addr: 2
Bit
Current Set Register
This register defines the Current Settings
Bit Name
Default Access
Description
Define the current on pin LED_OUT
00
1
1:0
current_mode
00
R/W
10
LED_OUT current is defined by ind_current,
assist_current and flash_current
01
LED_OUT current is defined by register 2, bits <7:3>
LSB = 10mA, full range = 320mA
11
LED_OUT current is defined by register 2, bits <7:3>
LSB = 15.625mA, full range = 500mA
Exact frequency switching between 4MHz/1MHz for assist
and flash modes for operation close to maximum
pulsewidth - see Figure 17 on page 10
2
2
1
R/W
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freq_switch_on
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4:3
5
ind_current
0
Pulseskip operation is allowed for all modes results in better efficiency
1
In flash and assist light mode, the DCDC is running at
4MHz or 1MHz (pulseskip is disabled) results in improved noise performance
Define the current on pin LED_OUT in indicator mode if
current_mode=00 or 10
10
R/W
00
ILED_OUT = 1.35mA (PWM with 1/32 duty cycle)
01
ILED_OUT = 2.9mA (PWM with 2/32 duty cycle)
10
ILED_OUT = 4.4mA (PWM with 3/32 duty cycle)
11
ILED_OUT = 6.0mA (PWM with 4/32 duty cycle)
Define the current on pin LED_OUT in assist light mode if
current_mode=00 or 10
assist_current
www.austriamicrosystems.com/AS3642
1
R/W
0
ILED_OUT = 51.6mA
1
ILED_OUT = 72.3mA
1.2-2
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AS3642
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 6. Current Set Register (Continued)
Current Set Register
Addr: 2
Bit
This register defines the Current Settings
Bit Name
Default Access
Description
flash_current
7:6
10
R/W
00
ILED_OUT = 260mA
01
ILED_OUT = 280mA
10
ILED_OUT = 300mA
11
ILED_OUT = 320mA
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Define the current on pin LED_OUT in flash mode if
current_mode=00 or 10
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Define the current on pin LED_OUT for flash and assist
mode (mode=10 or 11) if current_mode=01 or 11
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current_mode =
01
11
current
7:3
16h
R/W
0
ILED_OUT = 10mA
1
ILED_OUT = 20mA
31.25mA
2
ILED_OUT = 30mA
46.875mA
15.6mA
...
1F
ILED_OUT = 320mA
500mA
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1. Before changing current_mode register, write 0xA1 to register 0x80h (password protection). This sequence is
added to protect the flash LED against unintentional high currents for flash systems designed only up to
320mA.
Additionally do not change this register if the DCDC is operating.
2. For currents above 320mA, the AS3642 will always enable pulseskip mode (register setting of freq_switch_on
has no effect)
www.austriamicrosystems.com/AS3642
1.2-2
17 - 26
AS3642
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 7. Control Register
Control Register
Addr: 3
Bit
This register defines the operating mode and different protection
2
functions in I C interface
Bit Name
Default Access
Description
0h
30ms
1h
60ms
2h
90ms
3h
120ms
150ms
default value
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4h
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Define the duration of the flash timer
180ms
6h
210ms
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5h
flash_timer
3:0
4h
R/W
7h
240ms
8h
270ms
9h
300ms
Ah
330ms
Bh
360ms
Ch
390ms
Dh
420ms
Eh
450ms
Fh
480ms
AS3642 operating mode selection
mode
00
ca
5:4
reserved
0
ch
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7
external_strobe
3
0
Shutdown mode
01
Indicator light mode with ind_current
10
Assist light mode with assist_current
11
Flash mode with duration flash_timer with
flash_current (if current_mode=00b or 10b) or current
(if current_mode=10b or 11b)
1
2
R
reserved - don’t use
External strobe signal from pin LED_OUT
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R/W
00
0
no external strobe
1
A flash pulse with current defined by flash_current (if
current_mode=00b or 10b) or current (if
current_mode=10b or 11b) register is triggered on a
rising edge on LED_OUT (e.g. due to an external
signal pulling it high). At the same time this register is
automatically cleared. After the flash pulse (duration
defined by flash_timer) the AS3642 returns to
shutdown mode.
R/W
Note: Setting this bit automatically sets mode (see
page 18)=11 (flash mode)
A ongoing flash started with external_strobe
can be stopped by writing ‘0’ to
external_strobe and ‘00’ to mode.
www.austriamicrosystems.com/AS3642
1.2-2
18 - 26
AS3642
Datasheet - D e t a i l e d D e s c r i p t i o n
1. Before changing mode register to 01, write 0xA1 to register 0x80h (password protection).
2. Torch mode and assist light mode share the same operating mode and identical currents.
3. Before changing external_strobe register to 01, write 0xA1 to register 0x80h (password protection).
Table 8. Fault Register
Addr: 4
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Fault Register
This register identifies all the different fault conditions and provide
information about the LED detection
Bit
Bit Name
4:0
reserved
Default Access
0
Description
R
reserved - don’t use
fault_overtemp
5
0
R
lv
see Overtemperature Protection on page 11
0
No fault
1
Junction temperature limit has been exceeded
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see LED Short Circuit Protection on page 11
fault_led_short
6
0
R
0
No fault
1
A shorted LED is detected (pin LED_OUT)
see DCDC Overvoltage Protection on page 11
fault_ovp
7
Register Map
Table 9. Register Map
Register
Definition
Version Control
Current Set
13h
1
XXh
2
B4h
3
4
No fault
1
An overvoltage condition is detected (pin VOUT)
04h
00h
b6
b5
b4
b3
b2
b1
b0
fixed_id
reserved
flash_current
version
assist_c
urrent
ind_current
current if current_mode=10 or 11
external reserve
_strobe
d
mode
fault_ov fault_le fault_ov
p
d_short ertemp
freq_swi
tch_on
current_mode
flash_timer
reserved
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Fault
0
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Control
0
Content
b7
Design Info
R
Default
ca
Name
Addr
0
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1.2-2
19 - 26
AS3642
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
2
The AS3642 can be directly connected to an (existing) I C bus (e.g. from the baseband or camera processor). All functions are accessible by this interface. An strobe input can be done by adding a diode (with an optional resistor in
series) to the LED_OUT pin. Setting the register bit external_strobe=1 enable this input as a strobe input. The duration
2
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of the flash is programmed by the I C interface, but the exact starting time is defined by this input- see External Strobe
Input on page 10.
External Components
Input Capacitor CVIN
Table 10. Recommended Input Capacitor
C
TC Code
ESR
Rated
Voltage
Size
Manufacturer
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Part Number
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Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. Ceramic
capacitors are required for input decoupling and should be located as close to the device as is practical.
CL05A395MQ5NQKL
4.7µF +/-10%
>1.6µF @ VVIN
X5R
<20m
6V3
0402
Samsung ElectroMechancs
www.sem.samsung.co.kr
If a different input capacitor is chosen, ensure similar ESR value and at least 1.6µF capacitance at the maximum input
supply voltage. Larger capacitor values (C) may be used without limitations.
Output Capacitor CVOUT
Low ESR capacitors should be used to minimize VOUT ripple. Multi-layer ceramic capacitors are recommended since
they have extremely low ESR and are available in small footprints. The capacitor should be located as close to the
device as is practical.
X5R dielectric material is recommended due to their ability to maintain capacitance over wide voltage and temperature
range.
Table 11. Recommended Output Capacitor
Part Number
TC Code
ESR
Rated
Voltage
Size
Manufacturer
2x1.5µF +/-15%
X5R
<10m
6V3
0405
2-array
Panasonic
www.panasonic.com
Samsung ElectroMechancs
www.sem.samsung.co.kr
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ECJUNBPJ155K
C
CL14A185MQ8SAKL
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If a different output capacitor is chosen, ensure similar ESR values and at least 1.0µF capacitance at maximum output
voltage.
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Inductor LDCDC
The fast switching frequency (4MHz) of the AS3642 allows for the use of small SMDs for the external inductor. The
2
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inductor should have low DC resistance (DCR) to reduce the I R power losses - high DCR values will reduce efficiency.
Table 12. Recommended Inductor
Part Number
L
DCR
L @ 0.9A
Size
Manufacturer
LQM21PN1R0NGC
1.1µH
100m
>0.7µH
2x1.25x0.9mm
Murata
www.murata.com
ELGTEA1R0SN
1.0µH
>0.7µH
2x1.25x0.9mm
Panasonic
www.panasonic.com
www.austriamicrosystems.com/AS3642
1.2-2
20 - 26
AS3642
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Table 12. Recommended Inductor (Continued)
L
DCR
L @ 0.9A
Size
Manufacturer
CIG21K1R0SCE
1.17µH
135m
>0.7µH
2x1.25x0.9mm
Samsung ElectroMechancs
www.sem.samsung.co.kr
CKP2012N1R0M
1.0µH
110m
>0.7µH
2x1.25x0.9mm
Taiyo Yuden
www.t-yuden.com
MLP2012L1R0MT
1.0µH
>0.7µH
2x1.25x0.9mm
TDK
www.tdk.com
MDT2012-CR1R0AN
1.0µH
>0.7µH
2x1.25x0.9mm
Toko
www.toko.co.jp
110m
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Part Number
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If a different inductor is chosen, ensure similar DCR values and at least 0.7µH inductance at 0.9A input current.
LED
Use LED and optics as required by the system.
Part Number
CERAMOS LUW
C9SM
LXCL-PWF3
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Table 13. Recommended LEDs
Name
Lumen @ 300mA
Size
Manufacturer
Ceramos
55
2.04x1.64x0.75mm
Osram Opto Semiconductors
www.osram-os.com
Luxeon PWF3
30
2.04x1.64x0.7mm
Philips Lumileds
www.philipslumileds.com
PCB Layout Guideline
The high speed operation requires proper layout for optimum performance. Route the power traces first and try to minimize the area and wire length of the two high frequency/high current loops:
Loop1: CVIN - LDCDC - pin SW - pin GND - CVIN
Loop2: CVIN - LDCDC - pin SW - pin VOUT - CVOUT - pin GND - CVIN
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At the pin GND a single via (or more vias, which are closely combined) connects to the common ground plane. This
via(s) will isolate the DCDC high frequency currents from the common ground (as most high frequency current will flow
between Loop1 and Loop2 and will not pass the ground plane) - see the ‘ground via’ in Figure 24.
www.austriamicrosystems.com/AS3642
1.2-2
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AS3642
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 24. Layout recommendation
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AS3642
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Note: If component placement rules allow, move all components close to the AS3642 to reduce the area and length
of Loop1 and Loop2.
The recommended PCB pad size for the AS3642 is 250µm.
Application Self Testing Guideline
Using the in-build self testing features of the AS3642, the errors as shown in Figure 25 during the assembling and soldering of the AS3642, can be detected - this simplifies and can reduce cost during manufacturing:
Figure 25. Self Testing - Detecting Assembling and Soldering Errors
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AS3642
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The self testing procedure is simple:
www.austriamicrosystems.com/AS3642
1.2-2
22 - 26
AS3642
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
1. Write 0x20 into register 0x03 (Control register) [Enable assist light with default 72mA].
7
2
2. Read back register 0x03 - must return 0x20, otherwise LDCDC or I C (SCL or SDA) is broken
3. Write 0x00 into register 0x03 [Power off]
4. Read register 0x04 (Fault register) - must return 0x00, otherwise the LED is open or shorted
Table 14. How-to identify errors
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See Table 14 to identify the different possible soldering errors:
Identified by
SCL or SDA broken
writing 0x20 to 0x03 and read back of register 0x03 does not return 0x20
LDCDC broken
writing 0x20 to 0x03 and read back of register 0x03 does not return 0x20 - see DCDC
Broken Coil Detection on page 11
Flash LED shorted
register fault_led_short (see page 19) is set
Flash LED open
register fault_ovp (see page 19) is set
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Error
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Typical I2C programming example
A typical use case for the AS3642 is to generate a 480ms, 500mA flash pulse. The programming example is shown in
Table 15:
2
Table 15. I C Programing Example - 500mA, 480ms flash pulse
Sequence
C-Syntax
Purpose/Action
write 0xA1 to register 0x80h
AMSWriteByte(0x80,0xA1);
Use password to unlock next I C write
write 0xFF to register 0x02h
AMSWriteByte(0x02,0xFF);
Set 500mA mode
(current_mode (page 16)=11b)
and current (page 17) to 500mA
write 0x3F to register 0x03h
AMSWriteByte(0x03,0x3F);
Set flash_timer (page 18) to 480ms and
mode (page 18) to flash
(which automatically fires the flash and stops
it after flash_timer expired)
2
the AS3642 automatically returns to
shutdown mode
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- no further action required -
7. Alternative testing method: Instead of reading the internal registers, the current into the AS3642 can be
measured. During assist light mode, the supply current must increase by at least 60mA. If an error is
detected, the current source and the DCDC is automatically switched off - see Protection and Fault Detection Functions on page 11
www.austriamicrosystems.com/AS3642
1.2-2
23 - 26
AS3642
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 26. 6pin WL-CSP Marking
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Note:
AS3642
<Code>
Encoded Datecode (4 characters)
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Line 1:
Line 2:
Figure 27. 6pin WL-CSP Package Dimensions
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&
)
*
*
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" ## &
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#
$%&
'%(
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The coplanarity of the balls is 40µm.
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1.2-2
24 - 26
AS3642
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 16.
Table 16. Ordering Information
Description
Delivery Form
Package
AS3642-ZWLT
Ultra Small 500mA Inductive White LED Flash
Driver
Tape & Reel
6-pin WL-CSP
(1.5mm x 1.1mm x 0.6mm)
RoHS compliant / Pb-Free /
Green
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Model
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
Note: AS3642-ZWLT
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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
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AS3642Z ... Temperature Range: -30ºC - 85ºC
WL ... Wafer Level Chip Scale Package (WL-CSP)
T ... Delivery Form: Tape & Reel
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AS3642
Datasheet - O r d e r i n g I n f o r m a t i o n
Copyrights
Copyright © 1997-2011, austriamicrosystems AG, Schloss Premstaetten, 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.
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All products and companies mentioned are trademarks or registered trademarks of their respective companies.
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 lifesustaining 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
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Tobelbaderstrasse 30
Schloss Premstaetten
A-8141 Austria
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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