CH422 Datasheet - ETC

CH422 LED Nixie Tube Display Driver and I/O Extension Chip

Positive power, continuous current not less than 100mA Common ground, continuous current not less than 100mA Segment drive of LED nixie tube, active at high level Bidirectional input and output, built-in weak pull-up resistor Word drive of LED nixie tube, active at low level General purpose output, .

CH422 Datasheet 1 LED Nixie Tube Display Driver and I/O Extension Chip CH422 Datasheet Version: 2 1. Overview CH422 chip can be used for LED nixie tube display driver or I/O extension. CH422 has a built-in clock oscillation circuit, which can dynamically drive 4-bit LED nixie tubes or 32 LEDs. For I/O extension, CH422 can provide 8 bidirectional I/O pins and 4 general-purpose output pins. CH422 exchanges data with MCU through a two-wire serial interface. SCL MCU, etc. SDA CH422 LED nixie t.

CH422 Features

* Dynamic display scanning control, direct drive of 4-bit LED nixie tubes or 32 LEDs.

* Built-in current driving stage, segment current driving capacity not less than 15mA, output word current not less than 100mA.

* Built-in clock oscillator circuit, no need to provide external clock or

CH422-ETC.pdf