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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