CH450 Datasheet PDF - ETC LED drive and keyboard controller Specs

CH450 - LED drive and keyboard controller

Datasheet Summary

Description

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

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.

Datasheet Details

Part number	CH450
Manufacturer	ETC
File Size	227.66 KB
Description	LED drive and keyboard controller
Datasheet	CH450 Datasheet
Additional preview pages of the CH450 datasheet.

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Full PDF Text Transcription

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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.

Published: Jan 15, 2012 |