CH450 Datasheet - ETC

CH450 LED drive and keyboard controller

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.

w w w . D a t a S h e e t . c o . 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

CH450_ETC.pdf