CH450 Datasheet | Unknown Manufacturer

w w w . D a t a S h e e t . c o . k r The Data Sheet of CH450 (the first) LED drive and keyboard control chip CH450 English Data Sheet 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 15m A, the word current is no less than 80m A. - 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,patible 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 internal, don’t need outside to provide clock or connect surge device, anti-jamming capability is more stronger. - Set power-on reset internal, supplies reset output active with high-level to MCU. - Supplies DIP20 and SOP20 package without lead, patible with Ro HS, the function and pins are patible with CH455 in some parts. D a t a s h e e t p d f h t p : / w w w . D a t a S h e e t 4 U . n e t / w w w . D a t a S h e e t . c o . k r The Data Sheet of CH450 (the first) 3....