English DataSheet of CH455 1 LED drive and keyboard control chip CH455 English DataSheet Version:1C http://wch.cn 1.
Introduction CH455 is LED display drive and keyboard scan control chip.
It sets clock surge circuit internally to drive four bits number LED or thirty two LEDs dynamically.
And at the same time it can scan 28-key.
CH455 exchanges data with MCU via two wires serial interface of SCL and SDA..
MCU etc SCL SDA INT# CH455 (broken line is optional) SEG7~SEG0 SEG6 ~ 7×4 matrix 28 k