| Pin | Symbol | Type | Function (EN) |
|---|---|---|---|
| 1 | VBAT | Power | Power Supply Input (VBAT — 3.3V / 5.0V Standard Logic) |
| 2 | PC13 - TAMPER RTC(2) - | I/O | Multiplexed I/O & Peripheral Pin PC13 - TAMPER RTC(2) - (RTC/CLK) |
| 3 | PC14 - OSC32 IN(2)_ | I/O | Multiplexed I/O & Peripheral Pin PC14 - OSC32 IN(2)_ (RTC/CLK) |
| 4 | PC15 - OSC32 OUT(2)_ | I/O | Multiplexed I/O & Peripheral Pin PC15 - OSC32 OUT(2)_ (RTC/CLK) |
| 5 | OSC_IN | I/O | Multiplexed I/O & Peripheral Pin OSC_IN (RTC/CLK) |
| 6 | OSC_OUT | I/O | Multiplexed I/O & Peripheral Pin OSC_OUT (RTC/CLK) |
| 7 | NRST | I | System Enable & Hardware Reset (NRST) |
| 8 | PC0 | I/O | Multiplexed I/O & Peripheral Pin PC0 (UART, ADC, PWM) |
| 9 | PC1 | I/O | Multiplexed I/O & Peripheral Pin PC1 (UART, ADC, PWM) |
| 10 | PC2 | I/O | Multiplexed I/O & Peripheral Pin PC2 (UART, ADC, PWM) |
| 11 | PC3 | I/O | Multiplexed I/O & Peripheral Pin PC3 (ADC) |
| 12 | VSSA | GND | Ground Reference Pin (VSSA) |
| 13 | VDDA | Power | Power Supply Input (VDDA — 3.3V / 5.0V Standard Logic) |
| 14 | PA0 WKUP - | I/O | Multiplexed I/O & Peripheral Pin PA0 WKUP - (UART, ADC, PWM) |
| 15 | PA1 | I/O | Multiplexed I/O & Peripheral Pin PA1 (UART, ADC, PWM) |
| 16 | PA2 | I/O | Multiplexed I/O & Peripheral Pin PA2 (UART, ADC, PWM) |
| 17 | PA3 | I/O | Multiplexed I/O & Peripheral Pin PA3 (UART, ADC, PWM) |
| 18 | V_SS4 | I/O | Multiplexed I/O & Peripheral Pin V_SS4 (General) |
| 19 | V_DD4 | I/O | Multiplexed I/O & Peripheral Pin V_DD4 (General) |
| 20 | PA4 | I/O | Multiplexed I/O & Peripheral Pin PA4 (UART, SPI, ADC, DAC, PWM) |
| 21 | PA5 | I/O | Multiplexed I/O & Peripheral Pin PA5 (SPI, ADC, DAC) |
| 22 | PA6 | I/O | Multiplexed I/O & Peripheral Pin PA6 (SPI, ADC, PWM) |
| 23 | PA7 | I/O | Multiplexed I/O & Peripheral Pin PA7 (SPI, ADC, PWM) |
| 24 | PC4 | I/O | Multiplexed I/O & Peripheral Pin PC4 (UART, ADC, PWM) |
| 25 | PC5 | I/O | Multiplexed I/O & Peripheral Pin PC5 (ADC) |
| 26 | PB0 | I/O | Multiplexed I/O & Peripheral Pin PB0 (ADC, PWM) |
| 27 | PB1 | I/O | Multiplexed I/O & Peripheral Pin PB1 (ADC, PWM) |
| 28 | PB2 | I/O | Multiplexed I/O & Peripheral Pin PB2 (General) |
| 29 | PB10 | I/O | Multiplexed I/O & Peripheral Pin PB10 (UART, I2C) |
| 30 | PB11 | I/O | Multiplexed I/O & Peripheral Pin PB11 (UART, I2C) |
| 31 | VSS1_ | GND | Ground Reference Pin (VSS1_) |
| 32 | V_IO1 | I/O | Multiplexed I/O & Peripheral Pin V_IO1 (General) |
| 33 | PB12 | I/O | Multiplexed I/O & Peripheral Pin PB12 (UART, SPI, I2C, CAN) |
| 34 | PB13 | I/O | Multiplexed I/O & Peripheral Pin PB13 (UART, SPI, PWM, CAN) |
| 35 | PB14 | I/O | Multiplexed I/O & Peripheral Pin PB14 (UART, SPI, PWM) |
| 36 | PB15 | I/O | Multiplexed I/O & Peripheral Pin PB15 (SPI) |
| 37 | PC6 | I/O | Multiplexed I/O & Peripheral Pin PC6 (PWM) |
| 38 | PC7 | I/O | Multiplexed I/O & Peripheral Pin PC7 (PWM) |
| 39 | PC8 | I/O | Multiplexed I/O & Peripheral Pin PC8 (PWM) |
| 40 | PC9 | I/O | Multiplexed I/O & Peripheral Pin PC9 (PWM) |
| 41 | PA8 | I/O | Multiplexed I/O & Peripheral Pin PA8 (UART, PWM, RTC/CLK) |
| 42 | PA9 | I/O | Multiplexed I/O & Peripheral Pin PA9 (UART, PWM) |
| 43 | PA10 | I/O | Multiplexed I/O & Peripheral Pin PA10 (UART) |
| 44 | PA11 | I/O | Multiplexed I/O & Peripheral Pin PA11 (USB, UART, PWM, CAN) |
| 45 | PA12 | I/O | Multiplexed I/O & Peripheral Pin PA12 (USB, UART, CAN) |
| 46 | PA13 | I/O | Multiplexed I/O & Peripheral Pin PA13 (SWD/JTAG) |
| 47 | VSS2_ | GND | Ground Reference Pin (VSS2_) |
| 48 | VDD2_ | Power | Power Supply Input (VDD2_ — 3.3V / 5.0V Standard Logic) |
| 49 | PA14 | I/O | Multiplexed I/O & Peripheral Pin PA14 (SWD/JTAG) |
| 50 | PA15 | I/O | Multiplexed I/O & Peripheral Pin PA15 (SPI) |
| 51 | PC10 | I/O | Multiplexed I/O & Peripheral Pin PC10 (UART) |
| 52 | PC11 | I/O | Multiplexed I/O & Peripheral Pin PC11 (UART) |
| 53 | PC12 | I/O | Multiplexed I/O & Peripheral Pin PC12 (UART) |
| 54 | PD2 | I/O | Multiplexed I/O & Peripheral Pin PD2 (UART) |
| 55 | PB3 | I/O | Multiplexed I/O & Peripheral Pin PB3 (SPI) |
| 56 | PB4 | I/O | Multiplexed I/O & Peripheral Pin PB4 (SPI) |
| 57 | PB5 | I/O | Multiplexed I/O & Peripheral Pin PB5 (SPI, I2C) |
| 58 | PB6 | I/O | Multiplexed I/O & Peripheral Pin PB6 (USB, I2C, PWM) |
| 59 | PB7 | I/O | Multiplexed I/O & Peripheral Pin PB7 (USB, I2C, PWM) |
| 60 | BOOT0 | I | Input-Only Pin BOOT0 (General) |
| 61 | PB8 | I/O | Multiplexed I/O & Peripheral Pin PB8 (PWM) |
| 62 | PB9 | I/O | Multiplexed I/O & Peripheral Pin PB9 (PWM) |
| 63 | VSS3_ | GND | Ground Reference Pin (VSS3_) |
| 64 | V_IO3 | I/O | Multiplexed I/O & Peripheral Pin V_IO3 (General) |
CH32F203 (LQFP-64M(10x10))
CH32F203 (LQFP-100(14x14))
| Designator / Replacement MPN | Value / Package | Function & PCB Layout Rule |
|---|---|---|
| N/A BOM | Per application circuit LQFP-64M(10x10) | Size power & signal trace widths for rated load current following IPC-2221 clearance rules. |
Manufactured by WCH, the CH32F203RCT6 is housed in a LQFP-64M(10x10) package with 64 pins and a 0.50 mm lead pitch. Key pins include: 1 (VBAT: Power Supply Input (VBAT — 3.3V / 5.0V Standard Logic)), 2 (PC13 - TAMPER RTC(2) -: Multiplexed I/O & Peripheral Pin PC13 - TAMPER RTC(2) - (RTC/CLK)), 3 (PC14 - OSC32 IN(2)_: Multiplexed I/O & Peripheral Pin PC14 - OSC32 IN(2)_ (RTC/CLK)), 4 (PC15 - OSC32 OUT(2)_: Multiplexed I/O & Peripheral Pin PC15 - OSC32 OUT(2)_ (RTC/CLK)), 5 (OSC_IN: Multiplexed I/O & Peripheral Pin OSC_IN (RTC/CLK)), 6 (OSC_OUT: Multiplexed I/O & Peripheral Pin OSC_OUT (RTC/CLK)).
Normalized from the official datasheet mechanical drawing per IPC-7351B (Density Level B Nominal), CH32F203RCT6 (LQFP-64M(10x10)) has a nominal body envelope of 10.00 × 10.00 mm, pitch e = 0.50 mm, and 64 copper pads.
You can download the verified open-hardware (CERN-OHL-P-2.0) CAD library bundle for CH32F203RCT6 (WCH, LQFP-64M(10x10)) directly on this page, including KiCad 8 Footprints (.kicad_mod), Schematic Symbols (.kicad_sym), Autodesk Fusion 360 / Eagle (.lbr), and 3D STEP AP214 / WebGL GLB models.
| Pin # | Signal Name | Electrical Type | Functional Description & Design Notes |
|---|---|---|---|
| 1 | VBAT | Power_In | Primary positive power supply input (VBAT) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 2 | PC13 - TAMPER RTC(2) - | Digital_IO | Signal terminal PC13 - TAMPER RTC(2) - (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC13 - TAMPER RTC(2) -. Supported peripheral buses: RTC/CLK. |
| 3 | PC14 - OSC32 IN(2)_ | Digital_IO | Signal terminal PC14 - OSC32 IN(2)_ (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC14 - OSC32 IN(2)_. Supported peripheral buses: RTC/CLK. |
| 4 | PC15 - OSC32 OUT(2)_ | Digital_IO | Signal terminal PC15 - OSC32 OUT(2)_ (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC15 - OSC32 OUT(2)_. Supported peripheral buses: RTC/CLK. |
| 5 | OSC_IN | Digital_IO | Signal terminal OSC_IN (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: OSC_IN. Supported peripheral buses: RTC/CLK. |
| 6 | OSC_OUT | Digital_IO | Signal terminal OSC_OUT (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: OSC_OUT. Supported peripheral buses: RTC/CLK. |
| 7 | NRST | Digital_IO | Active-low hardware reset terminal (NRST): pulling this pin Low resets the processor core and peripherals. |
| 8 | PC0 | Digital_IO | Signal terminal PC0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC0. Supported peripheral buses: UART, ADC, PWM. |
| 9 | PC1 | Digital_IO | Signal terminal PC1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC1. Supported peripheral buses: UART, ADC, PWM. |
| 10 | PC2 | Digital_IO | Signal terminal PC2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC2. Supported peripheral buses: UART, ADC, PWM. |
| 11 | PC3 | Digital_IO | Signal terminal PC3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC3. Supported peripheral buses: ADC. |
| 12 | VSSA | GND | 0V electrical ground return terminal (VSSA) for internal core logic, I/O drivers, and analog sub-blocks. |
| 13 | VDDA | Power_In | Primary positive power supply input (VDDA) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 14 | PA0 WKUP - | Digital_IO | Signal terminal PA0 WKUP - (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA0 WKUP -. Supported peripheral buses: UART, ADC, PWM. |
| 15 | PA1 | Digital_IO | Signal terminal PA1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA1. Supported peripheral buses: UART, ADC, PWM. |
| 16 | PA2 | Digital_IO | Signal terminal PA2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA2. Supported peripheral buses: UART, ADC, PWM. |
| 17 | PA3 | Digital_IO | Signal terminal PA3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA3. Supported peripheral buses: UART, ADC, PWM. |
| 18 | V_SS4 | Digital_IO | Signal terminal V_SS4 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: V_SS4. Supported peripheral buses: General. |
| 19 | V_DD4 | Digital_IO | Signal terminal V_DD4 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: V_DD4. Supported peripheral buses: General. |
| 20 | PA4 | Digital_IO | Signal terminal PA4 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI1_NSS. Supported peripheral buses: UART, SPI, ADC, DAC, PWM. |
| 21 | PA5 | Digital_IO | Signal terminal PA5 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI1_SCK. Supported peripheral buses: SPI, ADC, DAC. |
| 22 | PA6 | Digital_IO | Signal terminal PA6 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI1_MISO. Supported peripheral buses: SPI, ADC, PWM. |
| 23 | PA7 | Digital_IO | Signal terminal PA7 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI1_MOSI. Supported peripheral buses: SPI, ADC, PWM. |
| 24 | PC4 | Digital_IO | Signal terminal PC4 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC4. Supported peripheral buses: UART, ADC, PWM. |
| 25 | PC5 | Digital_IO | Signal terminal PC5 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC5. Supported peripheral buses: ADC. |
| 26 | PB0 | Digital_IO | Signal terminal PB0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB0. Supported peripheral buses: ADC, PWM. |
| 27 | PB1 | Digital_IO | Signal terminal PB1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB1. Supported peripheral buses: ADC, PWM. |
| 28 | PB2 | Digital_IO | Signal terminal PB2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB2. Supported peripheral buses: General. |
| 29 | PB10 | Digital_IO | Signal terminal PB10 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: I2C2_SCL. Supported peripheral buses: UART, I2C. |
| 30 | PB11 | Digital_IO | Signal terminal PB11 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: I2C2_SDA. Supported peripheral buses: UART, I2C. |
| 31 | VSS1_ | GND | 0V electrical ground return terminal (VSS1_) for internal core logic, I/O drivers, and analog sub-blocks. |
| 32 | V_IO1 | Digital_IO | Signal terminal V_IO1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: V_IO1. Supported peripheral buses: General. |
| 33 | PB12 | Digital_IO | Signal terminal PB12 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI2_NSS, I2C2_SMBA. Supported peripheral buses: UART, SPI, I2C, CAN. |
| 34 | PB13 | Digital_IO | Signal terminal PB13 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI2_SCK. Supported peripheral buses: UART, SPI, PWM, CAN. |
| 35 | PB14 | Digital_IO | Signal terminal PB14 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI2_MISO. Supported peripheral buses: UART, SPI, PWM. |
| 36 | PB15 | Digital_IO | Signal terminal PB15 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI2_MOSI. Supported peripheral buses: SPI. |
| 37 | PC6 | Digital_IO | Signal terminal PC6 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC6. Supported peripheral buses: PWM. |
| 38 | PC7 | Digital_IO | Signal terminal PC7 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC7. Supported peripheral buses: PWM. |
| 39 | PC8 | Digital_IO | Signal terminal PC8 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC8. Supported peripheral buses: PWM. |
| 40 | PC9 | Digital_IO | Signal terminal PC9 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC9. Supported peripheral buses: PWM. |
| 41 | PA8 | Digital_IO | Signal terminal PA8 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA8. Supported peripheral buses: UART, PWM, RTC/CLK. |
| 42 | PA9 | Digital_IO | Signal terminal PA9 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA9. Supported peripheral buses: UART, PWM. |
| 43 | PA10 | Digital_IO | Signal terminal PA10 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA10. Supported peripheral buses: UART. |
| 44 | PA11 | Digital_IO | Signal terminal PA11 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA11. Supported peripheral buses: USB, UART, PWM, CAN. |
| 45 | PA12 | Digital_IO | Signal terminal PA12 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA12. Supported peripheral buses: USB, UART, CAN. |
| 46 | PA13 | Digital_IO | Signal terminal PA13 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA13. Supported peripheral buses: SWD/JTAG. |
| 47 | VSS2_ | GND | 0V electrical ground return terminal (VSS2_) for internal core logic, I/O drivers, and analog sub-blocks. |
| 48 | VDD2_ | Power_In | Primary positive power supply input (VDD2_) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 49 | PA14 | Digital_IO | Signal terminal PA14 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA14. Supported peripheral buses: SWD/JTAG. |
| 50 | PA15 | Digital_IO | Signal terminal PA15 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI3_NSS. Supported peripheral buses: SPI. |
| 51 | PC10 | Digital_IO | Signal terminal PC10 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC10. Supported peripheral buses: UART. |
| 52 | PC11 | Digital_IO | Signal terminal PC11 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC11. Supported peripheral buses: UART. |
| 53 | PC12 | Digital_IO | Signal terminal PC12 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PC12. Supported peripheral buses: UART. |
| 54 | PD2 | Digital_IO | Signal terminal PD2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PD2. Supported peripheral buses: UART. |
| 55 | PB3 | Digital_IO | Signal terminal PB3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI3_SCK. Supported peripheral buses: SPI. |
| 56 | PB4 | Digital_IO | Signal terminal PB4 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI3_MISO. Supported peripheral buses: SPI. |
| 57 | PB5 | Digital_IO | Signal terminal PB5 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: I2C1_SMBA, SPI3_MOSI. Supported peripheral buses: SPI, I2C. |
| 58 | PB6 | Digital_IO | Signal terminal PB6 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: I2C1_SCL. Supported peripheral buses: USB, I2C, PWM. |
| 59 | PB7 | Digital_IO | Signal terminal PB7 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: I2C1_SDA. Supported peripheral buses: USB, I2C, PWM. |
| 60 | BOOT0 | Digital_IO | Signal terminal BOOT0 (I, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: BOOT0. Supported peripheral buses: General. |
| 61 | PB8 | Digital_IO | Signal terminal PB8 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB8. Supported peripheral buses: PWM. |
| 62 | PB9 | Digital_IO | Signal terminal PB9 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB9. Supported peripheral buses: PWM. |
| 63 | VSS3_ | GND | 0V electrical ground return terminal (VSS3_) for internal core logic, I/O drivers, and analog sub-blocks. |
| 64 | V_IO3 | Digital_IO | Signal terminal V_IO3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: V_IO3. Supported peripheral buses: General. |