CH422G

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.

Key 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, GPIOs, are extended remotely through a two-wire serial interface.
• 4 general-purpose output pins can choose push-pull output or open-drain output.
• Support 3-5V supply voltage and low power sleep, can be awakened by input level change.
• High speed two-wire serial interface, clock speed from 0 to 1MHz, compatible with two-wire I2C bus, saving pins.
• Adopt SOP16 lead-free package, compatible with RoHS.