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

Datasheet Summary

Description

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,

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 external oscillator components, more anti-interference.
  • 8 general-purpose I/O pins, GPIOs, and 4 general-purpose output pins, GPOs, are extended remotely through a two-wire serial interface.

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Datasheet preview – CH422

Datasheet Details

Part number CH422
Manufacturer ETC
File Size 221.62 KB
Description LED Nixie Tube Display Driver and I/O Extension Chip
Datasheet download datasheet CH422 Datasheet
Additional preview pages of the CH422 datasheet.

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Full PDF Text Transcription

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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 tube driver SEG7～SEG0 DIG3～DIG0 4-bit LED nixie tube or 32 LEDs SCL MCU, etc. SDA CH422 I/O expansion IO7～IO0 OC3～OC0 8-bit input or 8-bit output 4-bit output Optional open drain 2. Features ● Dynamic display scanning control, direct drive of 4-bit LED nixie tubes or 32 LEDs.
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