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本帖最后由 snoopy8008 于 2013-5-7 22:34 编辑
图片是ICL7135 datasheet里的。
图中用7447+三极管驱动共阳LED数码管。
Digit Drives (Pins 12, 17, 18, 19 and 20)
Each digit drive is a positive going signal that lasts for 200 clock pulses. The scan sequence is D5 (MSD), D4 , D3 , D2 , and D1 (LSD). All five digits are scanned and this scan is continuous unless an overrange occurs. Then all digit drives are blanked from the end of the strobe sequence until the beginning of Reference Integrate when D5 will start the scan again. This can give a blinking display as a visual indication of overrange.
BCD (Pins 13, 14, 15 and 16)
每个数字驱动脚是持续200个时钟脉冲的正信号,扫描顺序从D5到D1,除非超量程,否则一直循环扫描。………………(超量程时闪烁显示)
The Binary coded Decimal bits B8 , B4 , B2 , and B1 are positive logic signals that go on simultaneously with the digit driver signal.
BCD码引脚B8B4B2B1是与数字驱动脚同步的正信号。 |
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