ST2226A

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 9 7 1 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 www.DataSheet4U.com 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...