CH450 controller equivalent, led drive and keyboard controller.
* Set display current drive layer internal, the segment current is no less than 15mA, the word current is no less than 80mA.
* Dynamically display scan control, d.
Positive power, the persistent current is no less than 100mA Public ground, the persistent current is no less than 100mA Segment drive of numeric LEDs, high-level active, keyboard scan input, high-level active, with pull-down resistor Word drive of n.
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