* 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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