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DM621 Datasheet

12-CHANNELS PRE-PROGRAMMABLE CONSTANT CURRENT LED DRIVER

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DM621
Version
: A.007
Issue Date : 2010/08/03
File Name : SP-DM621-A.007.doc
Total Pages : 22
12-CHANNELS PRE-PROGRAMMABLE
CONSTANT CURRENT LED DRIVER
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.
Tel886-3-5645656 Fax886-3-5645626




SiTi

DM621 Datasheet Preview

DM621 Datasheet

12-CHANNELS PRE-PROGRAMMABLE CONSTANT CURRENT LED DRIVER

No Preview Available !

DM621
DM621
12-CHANNELS PRE-PROGRAMMABLE
CONSTANT CURRENT LED DRIVER
General Description
The DM621 is an innovative LED driver that integrates a new data transmit interface to
accomplish 2-wires control for lighting applications. By the combination of SIN and
DCK, DM621 could be pre-programmed to set the operating modes that involve GCK
frequency division, PWM grayscale selection, inverse IOUT PWM signal, and GCK
frequency selection. DM621 also provides the auto-latch function and incorporates a
particular PWM method (AS-PWM). The IOUT waveform is averagely divided into 16
sections in order to reduce the flickers and enhance the visual refresh rate. The DM621
could also be constructed as a PWM controller for LED drivers. In this case, resistors
must be connected at output pins to achieve this function (Fig.18).
This chip incorporates 4x3-channel constant current circuitry with current value set by
3 external resistors and 256/1024/4096/16384 gray scale PWM function unit. Each
channel provides a maximum current of 90mA. The maximum output sustaining voltage
of 28V would make more serial LEDs possible. And DM621 also integrates an internal
regulator to make power supply voltage up to 12V. Meanwhile, retiming of DCKO and
SOUT is advantageous in the LED decorating and long-cascade applications.
Features
z 4 x 3(R/G/B) Output Channels
z 8/10/12/14-bits PWM grayscale Control
z Maximum Clock Frequency: 20MHz
z Constant Current Output: 5mA to 90mA
z Maximum Output Sustaining voltage: 28V
z Power Supply Voltage: 5V to 12V
z Average Separated IOUT PWM Waveform
z Auto-latch Function
z Retiming of DCKO and SOUT for long cascade applications
z Serial Shift-In Architecture for Data of Grayscale, frequency Division and PWM bit number
z Incorporating internal GCK oscillator 12MHz (Refresh rate = 46.8KHz @ 8-bits PWM)
z Package: TSSOP24 (with thermal pad), QFN20 (with thermal pad)
12-Channels Pre-programmable Constant Current LED Driver Version:A.007
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Page 1


Part Number DM621
Description 12-CHANNELS PRE-PROGRAMMABLE CONSTANT CURRENT LED DRIVER
Maker SiTi
Total Page 22 Pages
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