CH455 Overview
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...
CH455 Key Features
- Set display current drive layer internally, the current of segment is no less than 25mA, the current of word is no less
- Display scan control dynamically, support 8×4 or 7×4, directly drive four bits number LED or
- 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
- High speed two wires serial interface, the speed of clock varies from 0 to 4MHz, patible with I2C bus, save pins
- Set turn on power to reset, 2.7V~5V power
- Support low exhaust sleep mode to save energy, awoke via press key or mand
- Set clock surge circuit internally, the external clock or surge equipment is not necessary, resister