CH450

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 signal to MCU. SCL SDA MCU etc CH450 chip INT# (broken line are optional) RSTH DIG7～DIG2 8×6 matrix 48 keys keyboard SEG7～SEG0 Six bits numeric LEDs or forty eight LEDs 2. 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 matrix keyboard scan. ● Set pull-down resistor internal on the key pressed station, and set eliminate dithering circuit internal. ● Supplies keyboard interrupt active with low-level, supplies key-press release sign bit, to detect key is pressed or released. ● High-speed two wires serial interface, the speed of clock varies from 0 to 4MHz,compatible with two wires I2C bus, save pins. ● Set clock surge circuit internal, the outside supplies clock or surging equipments is no need, stand against disturbing. ● Set clock surging circuit i...