PWM-Controlled Constant Current Driver
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ST2226A
Version Issue Date File Name Total Pages : A.010 : 2004/04/12 : SP-ST2226A-A.010.doc : 23
...
Description
www.DataSheet4U.com
ST2226A
Version Issue Date File Name Total Pages : A.010 : 2004/04/12 : SP-ST2226A-A.010.doc : 23
PWM-Controlled Constant Current Driver for LED Displays
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SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Pard, Hsin-Chu, Taiwan 300, R.O.C Fax:886-3-5645626 Tel:886-3-5645656
www.DataSheet4U.com
SILICON TOUCH TECHNOLOGY INC.
ST2226A
ST2226A PWM-Controlled Constant Current Driver for LED Displays
General Description
The ST2226A is a LED driver incorporating shift registers, data latches, 16-channel constant current circuitry with current value set by an external resistor, 1024 gray level PWM (Pulse Width Modulation) functional unit and time division capability. Each channel can provide a maximum current of 60 mA. Time division operation allows driving up to 1 or 2 LEDs with a single output channel (mode-1 and mode-2 respectively).
Block Diagram
IOUT0
……
IOUT15
Rext
Voltage Reference
Driver (16-Channel)
GCLK
PWM Counter
Comparator (16-Channel)
CMD[2:0]
Operation Control
Shift Register and Latch (10 Bit x 16-Channel x 2LED)
DCLK DIN
DOUT
Figure 1. Functional block diagram
ST2226A
Version:A.010
Page:1
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SILICON TOUCH TECHNOLOGY INC.
ST2226A
Features
˙ ˙ ˙ ˙ ˙ ˙ Constant current outputs with current value settings by an external resistor Maximum output current: 60 mA Time division output allows the driving of 1 or 2 LEDs with a single output Maximum / minimum output voltage...
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