Document
DM631
Version
: A.003
Issue Date : 2008/05/12
File Name : SP-DM631-A.003.doc
Total Pages : 24
16-CHANNEL CONSTANT CURRENT LED DRIVER WITH PROGRAMMABLE PWM OUTPUTS
9 7 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
SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel:886-3-5645656 Fax:886-3-5645626
DM631
DM631
16-CHANNEL CONSTANT CURRENT LED DRIVER WITH PROGRAMMABLE PWM OUTPUTS
General Description
DM631 is a 16-channel constant current sink LED driver. Each channel has adjustable 12-bits (4096 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 function, 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 12-bit 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 (~4.4KHz) with internal oscillator (~ 18 MHz)) z Build-in real-time LED open detection z Package and pin assignment (except QFN32) compatible to pure LED drivers 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 12-bit PWM Constant Current LED Driver Version:A.003
、、, Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
Page 1
SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel:886-3-5645656 Fax:886-3-5645626
Block Diagram
OUT 0
OUT 1
OUT 15
DM631
VCC GND
LED Open Detector (0)
LED Open Detector (1)
LED Open Detector (15)
Internal Oscillator
Constant Current Driver Constant Current Driver (0) (1)
Constant Current Driver (15)
REXT
12-bit Counter
12-bit PWM Generator 12-bit PWM Generator (0) (1)
LAT
12 12
12-bit Latch Register (0)
12-bit Latch Register (1)
DAI
12 12
12-bit Shift Register (0)
12-bit Shift Register (1)
DCK
12-bit PWM Generator (15)
12
12-bit Latch Register (15)
12
12-bit Shift Register (15)
SOMODE /GCK
DAO
16-channel 12-bit PWM Constant Current LED Driver Version:A.003
、、, Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
Page 2
SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel:886-3-5645656 Fax:886-3-5645626
Pin Connection
DM631
R EXT DAO
SOMODE / GCK OUT15 OUT14 OUT13 OUT12 OUT11
GND DAI DCK LAT OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7
1 24
2 23
3 22
4 SOP24 21
5 20
SOP24B
6 19
7 SSOP24 18
8 17
9 16
TSSOP24E
10 15
11 ( top view )
12
14 13
VCC REXT DAO SOMODE/GCK OUT 15 OUT 14 OUT 13 OUT 12 OUT 11 OUT 10 OUT 9 OUT 8
OUT10 OUT9 OUT8 GND GND OUT7 OUT6 OUT5
2425 26 27 28 29 30 31 321
23 2
22 3
21 QFN32
20 19 ( bottom view )
4 5 6
18 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
Pin Description
PIN No.
SOP24/SOP24B/SSOP24 /TSSOP24E: 1 TSSOP24E, QFN32: exposed pad QFN32: 1, 2, 5, 6, 7, 8, 20,21
PIN NAME GND Ground terminal.
FUNCTION
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.
SOP24/SOP24B/SSOP24 /TSSOP24E: 4 QFN32: 11
LAT
Input terminal of data strobe: (level trigger) ‘H’ means latch register keep data ‘L’ means latch register gets data
SOP24/SOP24B/SSOP24/TSSOP24E: 5~20 OUT0~15 Sink constant-current outputs (open-drain).
QFN32: 12~19, 22~29
SOP24/SOP24B/SSOP24 /TSSOP24E: 21 QFN32: 30
SOP24/SOP24B/SSOP24 /TSSOP24E: 22 QFN32: 31
SOMODE /GCK
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.
DAO Serial data output terminal.
SOP24/SOP24B/SSOP24 /TSSOP24E: 23 QFN32: 32
SOP24/SOP24B/SSOP24 /TSSOP24E: 24 QFN32: 3, 4
REXT
External resistors connected between REXT and GND for output current value setting.
VCC Supply voltage terminal.
16-channel 12-bit PWM Constant Current LED Driver Version:A.003
、、, Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
Page 3
SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel:886-3-564565.