# CH422G (Component) ## Description Digital tube display driver and I/O expansion chip 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. ## Component Details - **Owner:** cherepanyadima - **Created:** 6/26/2026 - **Last Updated:** 6/26/2026 - **Visibility:** Public - **Symbol Style:** parametric-v1 - **License:** https://creativecommons.org/licenses/by/4.0/ - **Manufacturer Name:** WCH - **LCSC Part Number:** C57543 - **Manufacturer Part Number:** CH422G - **Datasheet URL:** https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/653b73aff1866d129a7dcd6667d46854c7f7ed10ef8765c4ab6558eeb9df02ff.pdf - **Part Type:** Integrated Circuit ## Distributor Pricing (qty 1) *Pricing shown for quantity 1. For price breaks and other quantities, open in Flux.* | Distributor | Unit Price (qty 1) | Stock | |------------|--------------------|-------| | [LCSC](https://www.lcsc.com/product-detail/span-style-background-color-ff0-i-span-span-style-background-color-ff0-o-span-expanders_wch-jiangsu-qin-heng-ch422g_C57543.html) | N/A | N/A | - **Part Type:** Integrated Circuits - **Sub-Type:** Logic - **MPN:** CH422G - **Mount Type:** Wire - **Pin Count:** 16 - **Logic Function:** AND ## Pins | Pin | Name | Type | |-----|------|------| | 1 | SEG4 / IO4 | | | 2 | SEG5 / IO5 | | | 3 | SEG6 / IO6 | | | 4 | SEG7 / IO7 | | | 5 | SCL | | | 6 | SDA | | | 7 | GND | | | 8 | DIG0 / OC0 | | | 9 | DIG1 / OC1 | | | 10 | DIG2 / OC2 | | | 11 | DIG3 / OC3 | | | 12 | SEG0 / IO0 | | | 13 | SEG1 / IO1 | | | 14 | SEG1 / IO1 | | | 15 | SEG2 / IO2 | | | 16 | SEG3 / IO3 | | --- *Generated from [https://www.flux.ai/cherepanyadima/ch422g~bh](https://www.flux.ai/cherepanyadima/ch422g~bh)*