# CH571R

**WCH(Jiangsu Qin Heng)** · Microcontrollers (MCU/MPU/SOC) · TSSOP-16

CH571R from WCH(Jiangsu Qin Heng), in a TSSOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | PA15 | bidirectional | General-purpose I/O PA15 with analog ADC input AIN5, SPI0 MISO (master input/slave output) and UART0 RXD0_ remap. |
| 2 | PA14 | bidirectional | General-purpose I/O PA14 with analog ADC input AIN4, SPI0 MOSI (master output/slave input) and UART0 TXD0_ remap. |
| 3 | PA13 | bidirectional | General-purpose I/O PA13 with analog ADC input AIN3 and SPI0 serial clock SCK0. |
| 4 | PA12 | bidirectional | General-purpose I/O PA12 with analog ADC input AIN2 and SPI0 active-low slave chip-select input SCS. |
| 5 | VIO33/VDD33 | power_in | Combined DC-DC/battery supply input and I/O supply input (2.3V to 3.6V for non-CH573X parts) needing a decoupling capacitor close to the pin, 0.1uF or more recommended. |
| 6 | PA8 | bidirectional | General-purpose I/O PA8 with UART1 serial data input RXD1. |
| 7 | PA9 | bidirectional | General-purpose I/O PA9 with timer 0 capture input/PWM output TMR0 and UART1 serial data output TXD1. |
| 8 | PB11 | bidirectional | General-purpose I/O PB11 with USB D+ data line UD+ (no series resistor allowed when used for USB) and timer 2 pin remap TMR2_. |
| 9 | PB10 | bidirectional | General-purpose I/O PB10 with USB D- data line UD- (no series resistor allowed when used for USB) and timer 1 pin remap TMR1_. |
| 10 | PB23 | bidirectional | General-purpose I/O PB23 with active-low external reset input RST# (internal pull-up, minimum pulse 100ns) and timer 0 pin remap TMR0_. |
| 11 | PB22 | bidirectional | General-purpose I/O PB22 with timer 3 capture input/PWM output TMR3. |
| 12 | X32MO | bidirectional | Inverting output of the high-frequency oscillator HSE, connects to one side of the 32MHz crystal. |
| 13 | X32MI | input | Input of the high-frequency oscillator HSE, connects to the other side of the 32MHz crystal. |
| 14 | VINTA | passive | Internal analog supply node needing a decoupling capacitor close to the pin: 0.47uF or larger without DC-DC, 1uF (0.47uF to 2.2uF supported) with DC-DC. |
| 15 | GND | power_in | Common ground, 0V reference point. |
| 16 | ANT | bidirectional | RF signal input/output, recommended to connect directly to the antenna. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | WCH(Jiangsu Qin Heng) |
| Package | TSSOP-16 |
| Category | Embedded Processors & Controllers |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `CH571R`
- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`
- 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files: `ch571r-etched.step` / `ch571r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ch571r.step` / `ch571r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [WCH(Jiangsu Qin Heng) datasheet](docs/ch571r-datasheet.pdf) (97 pp, sha256 `d2c436092d64dd3c`, retrieved 2026-10-26, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ch571r-datasheet.pdf)