CH455 - LED drive and keyboard control chip

CH455 Datasheet Preview — Preview of CH455 PDF

Datasheet Details

Part number	CH455
Manufacturer	ETC
File Size	178.29 KB
Description	LED drive and keyboard control chip
Datasheet	CH455-ETC.pdf

CH455 Product details

Description

Positive power, the persistent current is no less than 150mA Public ground, the persistent current is no less than 150mA Segment driver of LEDs, active with high level, Keyboard scan input, active with high level, with pull-down resistor Radix point segment output of LED, active with high level, Key-board interrupt output in 7-segment mode, active with low level Word diver of LED, active with low level, Key-board scan output, active with high level Data input and output of 2-wire serial interfac

Features

Set display current drive layer internally, the current of segment is no less than 25mA, the current of word is no less than 160mA.
Display scan control dynamically, support 8×4 or 7×4, directly drive four bits number LED or thirty two LEDs.
Internal limit current, set eight level light control via space percentage.
Set 28-key keyboard control, based on 7×4 matrix scan.
Set pull-down resistor internal while key-press, glitter removable.
Supply keyboard interr.

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Published: Jun 16, 2015 |