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CH452A

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by Ray

WCH Jiangsu Qin Heng Digital Tube Drivers, SOIC-28-300mil. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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CH452A

WCH Jiangsu Qin Heng · Digital Tube Drivers · SOIC-28-300mil

CH452A from WCH Jiangsu Qin Heng, in a SOIC-28-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 DIG7 output Word drive output 7 for LED nixie tube (active low, ~4x25 mA sink). Also used as column-scan output during keyboard scan. DIG6/DIG7 can be reused as GPO universal outputs.
2 DIG6 output Word drive output 6 for LED nixie tube (active low). Also used as column-scan output during keyboard scan and can be reused as GPO.
3 DIG5 output Word drive output 5 for LED nixie tube (active low). Also used as column-scan output during keyboard scan.
4 DIG4 output Word drive output 4 for LED nixie tube (active low). Also used as column-scan output during keyboard scan.
5 DIG3 output Word drive output 3 for LED nixie tube (active low). Also used as column-scan output during keyboard scan.
6 DIG2 output Word drive output 2 for LED nixie tube (active low). Also used as column-scan output during keyboard scan.
7 DIG1 output Word drive output 1 for LED nixie tube (active low). Also used as column-scan output during keyboard scan.
8 DIG0 output Word drive output 0 for LED nixie tube (active low). Also used as column-scan output during keyboard scan.
9 GND power_in Common ground. Continuous current not less than 150 mA.
10 GND power_in Common ground. Continuous current not less than 150 mA.
11 NC/GPI input No connection or general-purpose input; state reported in bit 7 of the returned key code.
12 RST output Power-on reset output, active high. Can be tied to the host MCU reset input.
13 RST# output Power-on reset output, active low. Complementary to RST for MCUs needing active-low reset.
14 H3L2 input Serial interface mode select with built-in pull-up. High selects the 4-wire serial interface; low selects the 2-wire (I2C-like) serial interface.
15 SEG0 bidirectional Segment drive 0 (active high, ~20 mA source) for LED nixie tube segment A; also acts as keyboard scan input (active high) with built-in pull-down resistor.
16 SEG1 bidirectional Segment drive 1 (active high) for segment B; also keyboard scan input with built-in pull-down.
17 SEG2 bidirectional Segment drive 2 (active high) for segment C; also keyboard scan input with built-in pull-down.
18 SEG3 bidirectional Segment drive 3 (active high) for segment D; also keyboard scan input with built-in pull-down.
19 SEG4 bidirectional Segment drive 4 (active high) for segment E; also keyboard scan input with built-in pull-down.
20 SEG5 bidirectional Segment drive 5 (active high) for segment F; also keyboard scan input with built-in pull-down.
21 SEG6 bidirectional Segment drive 6 (active high) for segment G; also keyboard scan input with built-in pull-down.
22 SEG7 bidirectional Segment drive 7 (active high) for the decimal point of the LED nixie tube; also keyboard scan input with built-in pull-down.
23 VCC power_in Positive power supply, 3V-5V. Continuous current not less than 150 mA. Requires 0.1 uF ceramic and >=100 uF electrolytic decoupling capacitors close to the pin.
24 DOUT/INT# output In 4-wire mode: serial data output DOUT (built-in pull-up, open-drain); also serves as keyboard interrupt output, active low. In 2-wire mode: interrupt output INT# (built-in pull-up, open-drain), keyboard interrupt active low.
25 LOAD/ADDR input In 4-wire mode: serial data load strobe LOAD (built-in pull-up). In 2-wire mode: address selection ADDR (built-in pull-up) for parallel-connecting two CH452 chips on the same bus.
26 DIN/SDA bidirectional In 4-wire mode: serial data input DIN (built-in pull-up). In 2-wire mode: serial data line SDA (semi-bidirectional, open-drain output plus input, built-in pull-up); I2C-compatible 400 kHz.
27 DCLK/SCL input In 4-wire mode: serial data clock DCLK (built-in pull-up, up to 10 MHz shift / spec limit 2 MHz for cascade). In 2-wire mode: serial clock SCL (built-in pull-up, 400 kHz I2C-compatible).
28 RSTI input Manual reset input, active high, with built-in pull-down resistor. Drives the internal reset and the RST/RST# outputs.

Key specifications

Parameter Value
Manufacturer WCH Jiangsu Qin Heng
Package SOIC-28-300mil
Category LED Drivers
Pins 28

Ordering variants

Same part, different packaging or reel option.

  • CH452A
  • CH452L

CAD (KiCad official)

  • Symbol: CH452A
  • Footprint: Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm
  • 3D model: SOIC-28-300mil (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: WCH Jiangsu Qin Heng datasheet (30 pp, sha256 9bca8400a8383cac, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF