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SCT2169

更新时间： 2024-02-17 18:44:11
品牌 Logo 应用领域
其他 - ETC /
页数 文件大小 规格书
15页 369K
描述
8-bit constant-current led

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SCT2169 数据手册

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StarChips  
Technology  
SCT2169 V01_01; Jun/13  
8-bit Constant-Current LED Driver with ModelessTM Error Detection  
Product Description  
The SCT2169 is a serialꢀinterfaced 8ꢀbit constantꢀcurrent sinker with error detection designed for LED  
displays and LED lighting applications. In applications, an external resistor is used to adjust the fullꢀscale  
output current from 20mA up to 120mA. The serial data are shifted into 8ꢀbit shift register by clock signal.  
Input data appear at the SDO output 8 clock cycles later to allow cascading of multiple SCT2169s. The  
latchꢀenable input, LA/, loads the 8 bits data of shift register into a 8ꢀbit latch to determine which LEDs  
are on and off. The output enable input, OE/ gates all 8 outputs on and off, and is fast enough to be  
used as PWM input for the LED intensity control.  
The SCT2169 combines the SCT2167/8 with ModelessTM technique to detect openꢀload and  
shortedꢀload errors while driving the LEDs without mode switching*. With the pinꢀtoꢀpin compatible  
design, all the LED display or lighting systems can be upgraded to perform the onꢀtheꢀfly errorꢀdetection  
functions simply by replacing all the SCT2167/8s with SCT2169s directly. Also, by the ModelessTM  
technique, the software and hardware works well without reworks between systems of the SCT2167/8  
and SCT2169.  
During operations, the SCT2169 takes only 200ns to generate error status codes after the rising edge of  
LA/. The error status codes saved in the shift register can be shifted out via SDO bitꢀbyꢀbit along with  
CLK, at the same time the new serial data can be shifted into SCT2169 via SDI. By comparing the  
display data with error status codes, the system control unit can read the error status to determine  
whether or not the LEDs are properly lit. If the input display signals are inconsistent with the  
corresponding output status code, the corresponding LEDs are determined to have been stuck open or  
short.  
Since the high clock frequency can reach up to 25MHz, the SCT2169 satisfies the system requirements  
of high volume data transmission to control the LED display. The SCT2169 also guarantees each output  
endures up to 7V voltage stress, thus each output can drive multiple LEDs. The ModelessTM SCT2169  
combines the error detection mechanism with display signals; hence the control unit does not need to  
switch between different modes, and therefore both the hardware costs and the control complexity can  
be reduced. In addition, the LED error status codes can be read in real time, and hence the fault status  
of the faulty LEDs can be discovered sooner.  
*Starchips’ patent protection.  
深圳市德凯源科技有限公司 SCT(晶锜科技)一级代理  
地址：深圳市福田区中航路都会电子城2B102A  
http;//www.dekay-sz.com  
TEL:0755-82571529/13428925925  
FAX:0755-89374156  
E-mail:dekay_sz@126.com  
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