CH455 chip equivalent, led drive and keyboard control chip.
* Set display current drive layer internally, the current of segment is no less than 25mA, the current of word is no less than 160mA.
* Display scan control dynam.
Positive power, the persistent current is no less than 150mA
Public ground, the persistent current is no less than 150mA
Segment driver of LEDs, active with high level,
Keyboard scan input, active with high level, with pull-down resistor
Radix point .
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