CH455 - ETC

CH455 LED drive and keyboard control chip

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 l.

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 interrupt active with low-level, and supply key-press release token to check the key is pressed or release.
● High speed two wires.