16-CHANNEL CONSTANT CURRENT LED DRIVER WITH

DM632
Version
: A.003
Issue Date : 2010/07/28
File Name : SP-DM632-A.003.doc
Total Pages : 25
16-CHANNEL CONSTANT CURRENT LED DRIVER
WITH PROGRAMMABLE PWM OUTPUTS
新竹市科學園區展業一路 9 號 7 樓之 1
SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Park,
Hsin-Chu, Taiwan 300, R.O.C.
Tel：886-3-5645656
Fax：886-3-5645626
DM632
DM632
16-CHANNEL CONSTANT CURRENT LED DRIVER
WITH PROGRAMMABLE PWM OUTPUTS
General Description
DM632 is a 16-channel constant current sink LED driver. Each channel has adjustable 16-bits
(65536 steps) grayscale PWM control current outputs. It incorporates shift registers, data latches,
constant current circuitry with current value set by an external resistor, selectable oscillator source
for PWM functioning, and built-in LED open detection circuit to detect error status. It is specifically
designed for LED display or lighting applications.
Features
z
Constant-current outputs: 5mA to 90mA adjustable by one external resistor
z
16-bit linear PWM control current outputs for each channel
z
Maximum output voltage: 17V
z
Maximum clock frequency: 25MHz
z
Selectable internal/external PWM reference clock
z
PWM free-running capability (refresh rate (~ 275Hz) with internal oscillator (~ 18 MHz))
z
Build-in real-time open detection
z
Package and pin assignment (except QFN32) compatible to pure LED driver series
(ST2221C, DM134/5/6, DM13C)
z
Power supply voltage: 3.3V to 5.5V
Applications
z
Indoor/Outdoor LED Video Display
z
LED Variable Message Signs (VMS) System
z
LED Decorative Lighting
Package Types
z SOP24, SOP24B, SSOP24, TSSOP24E (with exposed pad), QFN32 (with exposed pad)
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 1
DM632
z Block Diagram
OUT 0
OUT 1
OUT 15
LED Open Detector
(0)
LED Open Detector
(1)
LED Open Detector
(15)
Internal
Oscillator
Constant Current Driver
(0)
Constant Current Driver
(1)
Constant Current Driver
(15)
REXT
16-bit
Counter
16-bit PWM Generator
(0)
16-bit PWM Generator
(1)
16-bit PWM Generator
(15)
SOMODE
/GCK
VCC
GND
16
LAT
16-bit Latch Register
(0)
16
DAI
16-bit Shift Register
(0)
16
16-bit Latch Register
(1)
16
16-bit Latch Register
(15)
16
16-bit Shift Register
(1)
16
16-bit Shift Register
(15)
DAO
DCK
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 2
DM632
Pin Connection
1
24
2
23
3
4
5
6
7
8
9
10
22
SOP24
SOP24B
SSOP24
TSSOP24E
11
20
19
18
17
16
15
14
( top view )
13
OUT10
OUT9
OUT8
GND
GND
OUT7
OUT6
OUT5
25 26 27 28 29 30 31 32
1
24
23
2
22
3
21
20
19
QFN32
4
5
( bottom view )
18
6
7
17
8
16 15 14 13 12 11 10 9
GND
GND
VCC
VCC
GND
GND
GND
GND
DAI
DCK
LAT
OUT0
OUT1
OUT2
OUT3
OUT4
12
21
VCC
REXT
DAO
SOMODE/GCK
OUT 15
OUT 14
OUT 13
OUT 12
OUT 11
OUT 10
OUT 9
OUT 8
REXT
DAO
SOMODE / GCK
OUT15
OUT14
OUT13
OUT12
OUT11
GND
DAI
DCK
LAT
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
Pin Description
PIN No.
PIN NAME
FUNCTION
SOP24/SOP24B/SSOP24/TSSOP24E: 1
TSSOP24E, QFN32: exposed pad
QFN32: 1, 2, 5, 6, 7, 8, 20,21
GND
Ground terminal.
SOP24/SOP24B/SSOP24/TSSOP24E: 2
QFN32: 9
DAI
Serial data input terminal.
SOP24/SOP24B/SSOP24/TSSOP24E: 3
QFN32: 10
DCK
Synchronous clock input terminal for serial data transfer.
Data is sampled at the rising edge of DCK.
LAT
Input terminal of data strobe:
‘H’ means data on shift register goes through latch
(level trigger),
‘L’ means data is latched.
SOP24/SOP24B/SSOP24/TSSOP24E: 4
QFN32: 11
SOP24/SOP24B/SSOP24/TSSOP24E:
5~20
QFN32: 12~19, 22~29
OUT0~15
Sink constant-current outputs (open-drain).
SOP24/SOP24B/SSOP24/TSSOP24E: 21 SOMODE
/GCK
QFN32: 30
Serial Out Mode Selection(SOMODE) :
‘H’: DAO is shifted out and synchronized to
falling edge of DCK,
‘L’ : DAO is shifted out and synchronized to
rising edge of DCK.
Gray Scale Clock(GCK) : Input terminal for PWM operation.
SOP24/SOP24B/SSOP24/TSSOP24E: 22
QFN32: 31
DAO
Serial data output terminal.
SOP24/SOP24B/SSOP24/TSSOP24E: 23
QFN32: 32
REXT
External resistors connected between REXT and GND for
output current value setting.
SOP24/SOP24B/SSOP24/TSSOP24E: 24
QFN32: 3, 4
VCC
Supply voltage terminal.
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 3
DM632
Equivalent Circuit of Inputs and Outputs
1. DCK, DAI, LAT , SOMODE/GCK terminals
2. DAO terminals
PCB Layout Consideration
To connect an external resistor to REXT pin and ground can determine the maximum output
current. If there is any disturbance occurred to REXT pin, the constant current output may be
unstable or noisy. Since REXT (pin23), DAO (pin22), and SOMODE/GCK (pin21) are next to each
other, the most possible interference is caused by DAO or SOMODE/GCK signal. Accordingly, it is
recommended that adding some shielding area within the above pins in PCB layout, or laying the
signal line of above pins on different PCB layer will prevent the noise problems effectively.
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 4
DM632
Maximum Ratings (Ta=25°C, Tj(max) = 150°C)
CHARACTERISTIC
Supply Voltage
Input Voltage
SYMBOL
RATING
UNIT
VCC
-0.3 ~ 7.0
V
VIN
-0.3 ~ VCC+0.3
V
Output Current
IOUT
100
mA
Output Voltage
VOUT
-0.3 ~ 17
V
Input Clock Frequency
FDCK
25
MHz
GND Terminal Current
IGND
1600
mA
4.46 ( QFN32)
4.17 ( TSSOP24E exposed pad)
Power Dissipation
(4 layer PCB, at Ta=25℃)
W
2.45 ( SOP24 )
PD
2.19 ( SOP24B )
1.79 ( SSOP24 )
28 ( QFN32 )
30 ( TSSOP24E exposed pad)
Thermal Resistance
(4 layer PCB, at Ta=25℃)
Rth(j-a)
°C/W
51 (SOP24 )
57 (SOP24B )
70 (SSOP24 )
Operating Temperature
Top
-40 ~ 85
°C
Storage Temperature
Tstg
-55 ~ 150
°C
Recommended Operating Condition
SYMBOL
CONDITION
MIN.
TYP.
MAX.
UNIT
Supply Voltage
CHARACTERISTIC
VCC
⎯
3.3
5.0
5.5
V
Output Voltage
VOUT
Driver On
1.0
⎯
0.5VCC
Output Voltage
VOUT
Driver Off
⎯
⎯
17
5
⎯
90
Output Current
*2
IO
OUTn
IOH
VOH = VCC – 0.4 V
-0.8
⎯
-2
IOL
VOL = 0.2 V
+0.8
⎯
+2
VIH
Input Voltage
*1
VIL
VCC = 3.3 V ~ 5.5V
0.8VCC
⎯
VCC
0.0
⎯
0.2VCC
Input Clock Frequency
FDCK
Single Chip Operation
⎯
⎯
25
Input PWM Frequency
FGCK
3.3V~5.5V
⎯
⎯
25
15
⎯
⎯
LAT Pulse Width
Tw LAT
DCK Pulse Width
Tw DCK
15
⎯
⎯
Set-up Time for DAI
tsetup(D)
10
⎯
⎯
Hold Time for DAI
thold(D)
10
⎯
⎯
Set-up Time for LAT
tsetup(L)
10
⎯
⎯
Hold Time for LAT
thold(L)
10
⎯
⎯
FOSC
14.4
18
21.6
Internal Oscillator Frequency
*1
*2
VCC = 5.0V
V
mA
V
MHz
ns
MHz
Notice that the power dissipation is limited to its package and ambient temperature.
The driver output voltage including any overshoot stress has to be compliant with the maximum voltage (17V).
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 5
DM632
Electrical Characteristics (VCC = 5.0 V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
MIN.
TYP.
MAX.
Input Voltage “H” Level
VIH
CMOS logic level
0.8VCC
⎯
VCC
Input Voltage “L” Level
VIL
CMOS logic level
GND
⎯
0.2VCC
Output Leakage Current
IOL
VOH = 17 V
⎯
⎯
±1.0
VOL
IOL = 1.25 mA
⎯
⎯
0.2
VOH
IOH= 1.2 mA
VCC-0.4
⎯
⎯
⎯
⎯
±3
%
25.79
⎯
29.08
mA
Rrext = 2.2 KΩ
VOUT = 1 V ~ 3 V
⎯
±0.1
±0.5
% / VCC
Rrext = 2.2 KΩ
⎯
±1
±4
V(od)
all outputs turn on
⎯
0.3
⎯
IDD(off)
power on
all pins are open
unless VCC and GND
(fee-running mode)
⎯
5.39
6.5
IDD(off)
power on
all pins are open
unless VCC and GND
(external GCK mode)
⎯
4.57
⎯
IDD(on)
input signal is static
Rrext = 12.4 KΩ
all outputs turn off
⎯
5.91
⎯
IDD(on)
input signal is static
Rrext = 2.2 KΩ
all outputs turn off
⎯
8.10
⎯
IDD(on)
input signal is static
Rrext = 560 Ω
all outputs turn off
⎯
17.11
⎯
Output Voltage (S-OUT)
Output Current Skew
(Channel-to-Channel)
IOL1
*1
IOL2
*2
Output Voltage Regulation
% / VOUT
Supply Voltage Regulation
LED Open Detection Threshold
Supply Current
V
uA
V
VOUT = 1.0 V
Rrext = 2.2 KΩ
Output Current Skew
(Chip-to-Chip)
UNIT
*3
%/V
V
mA
*1
Channel-to-channel skew is defined as the ratio between (any Iout – average Iout) and average Iout, where average
Iout = (Imax + Imin) / 2.
*2
Chip-to-Chip skew is defined as the range into which any output current of any IC falls.
*3
IO excluded.
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 6
DM632
Electrical Characteristics (VCC = 3.3 V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
MIN.
TYP.
MAX.
Input Voltage “H” Level
VIH
CMOS logic level
0.8VCC
⎯
VCC
Input Voltage “L” Level
VIL
CMOS logic level
GND
⎯
0.2VCC
Output Leakage Current
IOL
VOH = 17 V
⎯
⎯
±1.0
VOL
IOL = 1.25 mA
⎯
⎯
0.2
VOH
IOH= 1.2 mA
VCC-0.4
⎯
⎯
⎯
⎯
±3
%
25.79
⎯
29.08
mA
Rrext = 2.2 KΩ
VOUT = 1 V ~ 3 V
⎯
±0.1
±0.5
% / VCC
Rrext = 2.2 KΩ
⎯
±1
±4
V(od)
all outputs turn on
⎯
0.3
⎯
IDD(off)
power on
all pins are open
unless VCC and GND
(fee-running mode)
⎯
3.8
⎯
IDD(off)
power on
all pins are open
unless VCC and GND
(external GCK mode)
⎯
3.39
⎯
IDD(on)
input signal is static
Rrext = 12.4 KΩ
all outputs turn off
⎯
4.33
⎯
IDD(on)
input signal is static
Rrext = 2.2 KΩ
all outputs turn off
⎯
6.54
⎯
IDD(on)
input signal is static
Rrext = 560 Ω
all outputs turn off
⎯
15.10
⎯
Output Voltage (S-OUT)
Output Current Skew
(Channel-to-Channel)
IOL1
*1
IOL2
*2
Output Voltage Regulation
% / VOUT
Supply Voltage Regulation
LED Open Detection Threshold
Supply Current
V
uA
V
VOUT = 1.0 V
Rrext = 2.2 KΩ
Output Current Skew
(Chip-to-Chip)
UNIT
*3
%/V
V
mA
*1
Channel-to-channel skew is defined as the ratio between (any Iout – average Iout) and average Iout, where average
Iout = (Imax + Imin) / 2.
*2
Chip-to-Chip skew is defined as the range into which any output current of any IC falls.
*3
IO excluded.
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 7
DM632
Switching Characteristics (VCC = 5.0V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
Propagation Delay
GCK-to-OUT
(‘L’ to ‘H’)
DCK-to-DAO
Propagation Delay
GCK-to-OUT
(‘H’ to ‘L’)
DCK-to-DAO
CONDITION
MIN.
TYP.
MAX.
⎯
45.74
⎯
⎯
37.16
⎯
⎯
23.76
⎯
⎯
27.82
⎯
⎯
18
⎯
⎯
6.96
⎯
⎯
33
⎯
⎯
⎯
4.6
ms
UNIT
tpLH
UNIT
VIH = VCC
VIL = GND
tpHL
Rrext = 2.2 KΩ
Output Current Rise Time
tor
Output Current Fall Time
tof
Output to output Delay Time Unit
VL = 5.0 V
CL = 13 pF
td
Output Current
(Propagation Delay after LAT trigger)
top*1
ns
Switching Characteristics (VCC = 3.3V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
MIN.
TYP.
MAX.
⎯
48.8
⎯
⎯
21.2
⎯
⎯
29.6
⎯
Rrext = 2.2 KΩ
⎯
17.6
⎯
VL = 3.3 V
⎯
20
⎯
⎯
8.25
⎯
⎯
34
⎯
⎯
⎯
4.6
GCK-to-OUT
Propagation Delay
(‘L’ to ‘H’)
DCK-to-DAO
Propagation Delay
GCK-to-OUT
(‘H’ to ‘L’)
DCK-to-DAO
tpLH
VIH = VCC
VIL = GND
tpHL
Output Current Rise Time
tor
Output Current Fall Time
tof
Output to output Delay Time Unit
td
Output Current
(Propagation Delay after LAT trigger)
CL = 13 pF
*1
top
ns
ms
VL
VCC
DAI
A
OUTn
DCK
CL
CL
CL
CL
REXT
LAT
SOMODE DAO
/GCK
Rrext
CL
GND
Switching Characteristics Test Circuit
*1
Reload the new PWM data at the end of the last PWM frame.
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 8
DM632
Constant-Current Output
Constant-current value (Iout*1)of each output channel is set by an external resistor connected
between the REXT pin and GND. The current scale ranging can be adjusted from 5mA to 90mA by
varying the resistor value. The reference voltage of REXT terminal (Vrext) is approximately 1.23V.
The output current value is calculated by the following equation:
Iout(mA)
5
10
20
30
40
50
60
70
80
90
M
50.86
48.60
48.39
47.66
46.97
46.13
44.74
43.94
43.20
42.24
Output Current as a Functiono Rext value
100
90
80
70
Iout (mA) ~
Iout(mA)
60
50
Vrext (V)
× M
Rrext (KΩ)
40
30
20
10
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
2.8
3
Rext(KΩ)
Output Current as a Function of Output Voltage
100
90
80
Iout (mA)
70
60
50
40
30
20
10
0
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
Vout (V)
In order to obtain a good performance of constant-current output, a suitable output voltage is
necessary. Users can get related information about the minimum output voltage above.
*1
Iout is typical current value setting under 100% PWM duty cycle.
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 9
DM632
Serial Data Interface
The serial-in data (DAI) will be clocked into 16 × 16 bit shift registers synchronized on the
rising edge of the clock (DCK). The data will be transferred into the 16 × 16 bit latch registers
when the strobe signal ( LAT ) is kept at high level (level trigger); otherwise, the data will be held.
The latch pulse should be sent after the falling edge of the last clock within a frame data. The trigger
timing of the serial-out data (DAO) will be shifted out on synchronization to the rising edge of the
clock if serial out selection (SOMODE) is kept at low level. And if serial out selection (SOMODE)
is kept at high level, the serial-out data (DAO) will be shifted out on synchronization to the falling
edge of the clock (DCK).
Input Data Format
LED Open Detection
DM632 provides a real time monitor of LED open detection function without extra components
or circuit design. It will be identified as a LED open failure when the output is turned on but the
output voltage is below 0.3V. The test result of each channel will write to its correspondent shift
register which is in LSB position (D15[0], D14[0], …., D0[0]) while strobe signal is active. User can
refer to timing diagram on page13. Detecting report could be retrieved from serial-out (DAO) data.
If the system reads ‘1’ back, that indicates LED is in normal status. But if ‘0’ was retrieved then
LED open failure has occurred. In order to make sure LED open detection function is in well
operating condition, it is recommended that all the luminance data are wrote to ‘1’ then almost
turning on the outputs during detection process.
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任
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Page 10
DM632
Serial-out Data Format
Selection of Internal/External PWM Frequency
The default operation mode is the free-running PWM signal generated by internal oscillator
after power-on. Users could switch internal to external PWM frequency source by following timing
sequence. There are two alternative options could be selected. The option 1 shows three rising edge
of latch pulses ( LAT ) when the clock (DCK) kept at high level then two rising edge of clock (DCK)
pulses when the latch pulse ( LAT ) kept at high level. Then the SOMODE/GCK pin could input
external frequency to operate PWM function. The option 2 shows four rising edge of latch
pulses( LAT ) when clock(DCK) kept at high level then sending three rising edge of clock (DCK)
signal, while latch( LAT ) signal kept high level at the same time. Meanwhile the GCK external
mode can be set back to the free-running mode. Notice that when internal RESET at low level, all
the shift registers in DM632 will be cleared (Kept at Low level) and all output current will be off
immediately.
DCK
LAT
Normal Operation
1
t
2
1
DCK
2
3
DCK
1
2
3
1
LAT
LAT
RESET
(internal)
RESET
(internal)
2
3
4
t
t
Option 1 : Timing Combination to set up
external GCK mode
16-channel 16-bit PWM Constant Current LED Driver
Option 2 : Timing Combination to set up
free-running mode
Version:A.003
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Page 11
DM632
Timing Diagram
1. DCK-DAI, DAO (SOMODE = ”L” at free-running mode, or external GCK mode)
tw DCK
50%
tw DCK
50%
50%
50%
DCK
t setup(D)
thold(D)
50%
50%
DAI
50%
DAO
50%
tpLH
tpHL
2. DCK, DAO (SOMODE = “H” at free-running mode)
tw DCK
DCK
50%
twDCK
50%
50%
50%
50%
DAO
50%
tpLH
tpHL
3. DCK-LAT
50%
50%
DCK
t setup(L)
t hold(L)
50%
50%
LAT
twLAT
4. Output to Output Delay Time Unit (n=2,3,4,5,6,7, 10, 11, 12, 13, 14, 15)
50%
OUTn
td
50%
OUTn-2
5. GCK-OUT0
50%
50%
GCK
50%
OUT0
tpLH
16-channel 16-bit PWM Constant Current LED Driver
50%
t pHL
Version:A.003
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Page 12
1
OUTn
E[0]*2
16-channel 16-bit PWM Constant Current LED Driver
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Version:A.003
When using external frequency for PWM operation, the PWM refresh rate (frame rate) can be calculated by following equation:
*8
For example, if the refresh rate in display system is higher than 60Hz, the input GCK frequency must be higher than 4MHz.
Total PWM resolution ( 216 )
Input GCK Frequency (Hz)
While switching to external GCK mode, outputs will be active after 65536 GCK pulse.
*7
Refresh Rate (Hz) =
Starting the new PWM frame after the last PWM period finish completely.
DC[255]
While switching to external GCK mode, all registers in DM632 will be reset simultaneously.
65536 x GCK*7
256
DC[0]
*6
2
DC[254]
*5
DB[255]
1
DC[255]
SOMODE function work in free-running mode.
Frame Data A
256
DB [0]
LAT is level trigger, not edge trigger.
DA[1]
255
DB [1]
*4
254
DB[2]
*3
<1 frame*6
DA[254]
2
DB[254]
E[0] is the error message of LED open detection.
DA[255]
1
DB[255]
DAO is shifted out on synchronization to rising / falling edge of DCK according to SOMODE is｀L＇/｀H＇.
256
DA[0]
*2
Frame Data Z
E[0]*2
255
254
DZ[1]
DA[1]
DA[2]
*1
(current)
5
*
SOMODE* /GCK
4
LAT
*
3
DAO
*
DCK
DAI
DC[254]
2
8
DC [253]
DD[254]
Frame Data C*
1
DD[255]
off
on
0
1
low
high
0
1
low
high
0
1
DM632
Timing Diagram (free-running mode switch to external GCK mode)
Page 13
DM632
Frame Data E
off
on
0
1
high
low
0
1
DF [253]
low
high
DF [254]
2
One free-running
PWM cycle
256
2
ED [253]
ED[254]
2
16-channel 16-bit PWM Constant Current LED Driver
OUTn
(current)
SOMODE/GCK
LAT
DAO
256
DCK
DAI
DD[0]
ED [255]
Frame Data C
1
DE[255]
DE[254]
256
Frame Data D
EE [255]
DE[0]
EE [254]
EE [253]
1
DF[255]
DF[254]
DF [0]
DF [255]
1
0
DG[255]
DG[254]
1
Timing Diagram (external GCK mode switch to free-running mode)
Version:A.003
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Page 14
DM632
Output Modulation Technique
DM632 provides a new LED drive technique of output modulation. It mixes traditional Pulse
Width Modulation (PWM) represented by LSB 12 bit with Sequential Split Modulation (SSM)
represented by MSB 4 bit. The main benefits of SSM are to drive LED with an equivalent higher
refresh rate (up to 380Hzn in DM632 when FGCK = 25MHz) and change bit to next bit smoothly.
The relationships between PWM and SSM in time domain can be refer to the diagram (not to scale)
below:
A complete modulation cycle
0
8
1
9
2
10
3
11
4
12
5
13
6
14
7
15
Sequential Split Modulation represented by Bit [15:12]
t
Traditional PWM Width represented by Bit [11:0]
Ultra High Resolution Current Outputs
DM632 could provide 16-bit linear PWM control current outputs for each channel. There are
two advantages for system design. One is DM632 has sufficient bit resolution (65536 steps), not
only LED color information but additional data such as global brightness, dot correction, and
gamma correction can be represented by the proper algorithms. The other is to reduce a lot of clock
and data rate compared to conventional ON-OFF type LED drivers.
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 15
DM632
Global Brightness Control
DM632 has no built-in global brightness control feature. In order to obtain a lower resolution
of global brightness control effect, two methods could be utilized. Here show different ways to
adjust the Rrext value or voltage drop across the external resistor. Please see the reference circuit
below:
Output to Output Delay
DM632 has build-in output to output delay with a special arrangement. This arrangement help
chip avoid noise cause by large current during channels switching. The arrangement details are
shown as following table.
Channel
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
Delay units 0
4
1
5
2
6
3
7
3
7
16-channel 16-bit PWM Constant Current LED Driver
2
6
1
Version:A.003
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5
0
4
Page 16
DM632
Power Dissipation
The power dissipation of a semiconductor chip is limited to its package and ambient
temperature, in which the device requires the maximum output current calculated for given
operating conditions. The maximum allowable power consumption can be calculated by the
following equation:
Pd(max)(Watt) =
Tj(junction temperature)(max)(°C)– Ta(ambient temperature)(°C)
Rth(junction-to-air thermal resistance)(°C/Watt)
The relationship between power dissipation and operating temperature can be refer to the figure
below:
5
QFN32
Power Dissipation Pd(W)
4.5
Tj(max)=150°C
4
Rth(QFN32)=28 °C/Watt
TSSOP24
3.5
Rth(TSSOP24)=30°C/Watt
3
Rth(SOP24)=51°C/Watt
SOP24
2.5
Rth(SOP24B)=57°C/Watt
2
SOP24B
1.5
SSOP24
Rth(SSOP24)=70°C/Watt
1
0.5
0
0
20
40
60
80
100
120
140
160
Ambient Temperature Ta ( ℃ )
The power consumption of IC can be determined by the following equation and should be less than
the maximum allowable power dissipation:
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 17
DM632
Typical Application
DM632
DM632
DM632
DM632
DM632
DM632
DM632
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 18
DM632
Package Outline Dimension
DM632-SSOP
12
A
C
A2
1
SEATING PLANE
b
e
L
0.004
L1
DIMENSIONS IN INCH
MIN.
MAX.
MIN.
MAX.
A
0.053
0.069
1.346
1.753
A1
0.004
0.010
0.102
0.254
A2
-
0.059
-
1.499
b
0.008
0.012
0.203
0.305
C
0.007
0.010
0.178
0.254
D
0.337
0.344
8.560
8.738
E
0.228
0.244
5.791
6.198
E1
0.150
0.157
3.810
3.988
L
L1
Θ
0.025 BSC.
0.016
0.050
0.041 BSC
0°
16-channel 16-bit PWM Constant Current LED Driver
8°
DETAIL A
DIMENSIONS IN MM
SYMBOLS
e
A1
GAUGE PLANE
A
13
E
24
E1
D
0.635 BSC
0.406
1.270
1.041 BSC
0°
8°
Version:A.003
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Page 19
DM632
Package Outline Dimension
DM632-SOPB
DIMENSIONS IN INCH
DIMENSIONS IN MM
SYMBOLS
MIN.
MAX.
MIN.
MAX.
A
-
0.075
-
1.900
A1
0.002
0.008
0.050
0.200
A2
0.051
0.067
1.300
1.700
b
0.012
0.020
0.300
0.500
c
0.004
0.010
0.100
0.250
D
0.504
0.520
12.800
13.200
E
0.303
0.327
7.700
8.300
e
0.0394 BSC
1.000 BSC
E1
0.228
0.244
5.800
6.200
L
0.010
0.026
0.250
0.650
θ
0°
10°
0°
10°
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 20
DM632
Package Outline Dimension
E
H
DM632-SOP
b
e
A
0.01 inch
D
GAUGE PLANE
SEATING PLANE
A1
0.004MAX.
DIMENSIONS IN INCH
SYMBOLS
MIN.
MAX.
A
-
A1
0.004
b
DIMENSIONS IN MM
MIN.
MAX.
0.104
-
2.642
-
0.102
-
0.016 BSC
0.406 BSC
D
0.612
0.624
15.545
15.850
E
0.292
0.299
7.417
7.595
e
L
0.050 BSC
1.270 BSC
H
0.405
0.419
10.287
10.643
L
0.021
0.041
0.533
1.041
Θ
0°
8°
0°
8°
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 21
DM632
Package Outline Dimension
DM632-TSSOP (exposed pad)
D1
24
E2
E
E1
13
12
1
e
b
0.25mm
S
GAUGE PLANE
SEATING PLANE
A
A2
D
L
A1
0.05
L1
DIMENSIONS IN INCH
SYMBOLS
MIN.
MAX.
DIMENSIONS IN MM
MIN.
MAX.
A
-
0.047
-
1.20
A1
0.000
0.006
0.00
0.15
A2
0.031
0.041
0.80
1.05
b
0.007
0.012
0.19
0.30
D
0.303
0.311
7.70
7.90
E1
0.169
0.177
4.30
4.50
E
0.252 BSC
6.400 BSC
e
0.026 BSC
0.650 BSC
L1
0.039 REF
1.000 REF.
L
0.018
0.030
0.45
0.75
S
0.008
-
0.20
-
Θ
0°
8°
0°
8°
E2
0.0898
0.1122
2.280
2.850
D1
0.146
1.819
3.700
4.620
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 22
DM632
Package Outline Dimension
DM632-QFN (exposed pad)
D2
25
b
32
24
1
E
E2
CO.35x45°
e
17
16
A1
D
8
9
L
A3
K
0.08
A
DIMENSIONS IN INCH
DIMENSIONS IN MM
SYMBOLS
MIN.
MAX.
MIN.
MAX.
A
0.028
0.031
0.70
0.80
A1
0
0.002
0
0.05
A3
b
0.008 REF.
0.007
0.203 REF.
0.012
0.180
0.300
D
0.193
0.201
4.900
5.100
E
0.193
0.201
4.900
5.100
e
0.0197 BSC
0.500 BSC
L
0.012
0.020
0.30
0.50
K
0.0079
-
0.2
-
D2
0.049
0.128
1.25
3.25
E2
0.049
0.128
1.25
3.25
Note: 1.DIMENSIONING AND TOLERANCING CONFORM TO ASME Y145.5M-1994.
2. REFER TO JEDEC STD. MO-220 WHHD-2 ISSUE A
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 23
DM632
The products listed herein are designed for ordinary electronic applications, such
as electrical appliances, audio-visual equipment, communications devices and so
on. Hence, it is advisable that the devices should not be used in medical
instruments, surgical implants, aerospace machinery, nuclear power control
systems, disaster/crime-prevention equipment and the like. Misusing those
products may directly or indirectly endanger human life, or cause injury and
property loss.
Silicon Touch Technology, Inc. will not take any responsibilities regarding the
misusage of the products mentioned above. Anyone who purchases any products
described herein with the above-mentioned intention or with such misused
applications should accept full responsibility and indemnify. Silicon Touch
Technology, Inc. and its distributors and all their officers and employees shall
defend jointly and severally against any and all claims and litigation and all
damages, cost and expenses associated with such intention and manipulation.
Silicon Touch Technology, Inc. reserve the right to make changes to their products
or to discontinue any product or service without notice, and advise customers to
obtain the latest version of relevant information to verify, before placing orders,
that information being relied on is current and complete.
16-channel 16-bit PWM Constant Current LED Driver
Version:A.003
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Page 24