CH450 Overview
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 output, high-level active DIG2～DIG7 4 SDA Data input and output of two wires serial interface 3 9 SCL RSTH Data clock of two...
CH450 Key Features
- Set display current drive layer internal, the segment current is no less than 15mA, the word current is no less than 80m
- 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-press release sign bit, to detect key is pressed or rele
- High-speed two wires serial interface, the speed of clock varies from 0 to 4MHz,patible with two wires I2C bus, save pin
- Set clock surge circuit internal, the outside supplies clock or surging equipments is no need, stand against disturbing
- Set clock surging circuit internal, don’t need outside to provide clock or connect surge device, anti-jamming capability
- Set power-on reset internal, supplies reset output active with high-level to MCU
- Supplies DIP20 and SOP20 package without lead, patible with RoHS, the function and pins are patible with CH455 in some p
