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 numeric LEDs, low-level active, keyboard scan outpu
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k r The DataSheet of CH450 (the first) 1 LED drive and keyboard control chip CH450 English DataSheet Version:1C http://wch.cn 1.
Introduction CH450 is numeric LEDs display drive and keyboard scan control chip.
CH450 sets clock surging circuit internal, drives six bits numeric LEDs or forty-eight LEDs automatically.
And it carries out forty-eight keys keyboard scan.
CH450 exchanges data with MCU via two wires serial interface and supplies power-up reset signa
CH450 Features
* 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, directly drive six bits numeric LEDs or forty eight LEDs.
* Set forty eight keys keyboard controller internal, basic on 8×6 mat
Datasheet Details
CH450
ETC
227.66 KB
Led drive and keyboard controller.
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