Mechanical Dimensions & Land Pattern (QFN-48-EP(5x5))
Extracted from Datasheet & IPC-7351B NormalizedRecommended Companion BOM & Drop-In Equivalents
Passive external components per reference schematic and 1:1 pin-compatible alternatives| Designator / Replacement MPN | Value / Package | Function & PCB Layout Rule |
|---|---|---|
| N/A BOM | Per application circuit QFN-48-EP(5x5) | Size power & signal trace widths for rated load current following IPC-2221 clearance rules. |
Technical Frequently Asked Questions (FAQ) — CH585M (QFN-48-EP(5x5))
Quick answers covering Pinout, IPC-7351B Land Pattern dimensions, and CAD export formatsWhat is the Pinout and operating voltage specification of CH585M (QFN-48-EP(5x5))?
Manufactured by WCH, the CH585M is housed in a QFN-48-EP(5x5) package with 49 pins and a 0.35 mm lead pitch. Key pins include: 1 (PA10: Multiplexed I/O & Peripheral Pin PA10 (General)), 2 (VDCID: Multiplexed I/O & Peripheral Pin VDCID (General)), 3 (VSW: Multiplexed I/O & Peripheral Pin VSW (General)), 4 (VDD33: Power Supply Input (VDD33 — 3.3V / 5.0V Standard Logic)), 5 (PA8/RXD1/LED7/A12: Multiplexed I/O & Peripheral Pin PA8/RXD1/LED7/A12 (UART)), 6 (PB9(4) PB8: Multiplexed I/O & Peripheral Pin PB9(4) PB8 (General)).
What are the IPC-7351B PCB Footprint dimensions for CH585M?
Normalized from the official datasheet mechanical drawing per IPC-7351B (Density Level B Nominal), CH585M (QFN-48-EP(5x5)) has a nominal body envelope of 5.00 × 5.00 mm, pitch e = 0.35 mm, and 49 copper pads plus a central exposed thermal pad (EPAD) of 3.70 × 3.70 mm with a 60% IPC-7525 windowed solder paste grid.
Where can I download KiCad (.kicad_mod, .kicad_sym), Fusion 360 (.lbr), and 3D STEP models for CH585M?
You can download the verified open-hardware (CERN-OHL-P-2.0) CAD library bundle for CH585M (WCH, QFN-48-EP(5x5)) 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.
Static Reference Appendix: Pinout Table (49 pins) & CH584 / CH585 Family VariantsExpand static table
| Pin # | Signal Name | Electrical Type | Functional Description & Design Notes |
|---|---|---|---|
| 1 | PA10 | Digital_IO | Signal terminal PA10 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA10. Supported peripheral buses: General. |
| 2 | VDCID | Digital_IO | Signal terminal VDCID (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: VDCID. Supported peripheral buses: General. |
| 3 | VSW | Digital_IO | Signal terminal VSW (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: VSW. Supported peripheral buses: General. |
| 4 | VDD33 | Power_In | Primary positive power supply input (VDD33) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 5 | PA8/RXD1/LED7/A12 | Digital_IO | Signal terminal PA8/RXD1/LED7/A12 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA8/RXD1/LED7/A12. Supported peripheral buses: UART. |
| 6 | PB9(4) PB8 | Digital_IO | Signal terminal PB9(4) PB8 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB9(4) PB8. Supported peripheral buses: General. |
| 7 | PB17 | Digital_IO | Signal terminal PB17 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB17. Supported peripheral buses: General. |
| 8 | PB16 | Digital_IO | Signal terminal PB16 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB16. Supported peripheral buses: General. |
| 9 | PB15(3)I/O/5VT | Power_In | Primary positive power supply input (PB15(3)I/O/5VT) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 10 | PB14(3)I/O/5VT | Power_In | Primary positive power supply input (PB14(3)I/O/5VT) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 11 | PB13 | Digital_IO | Signal terminal PB13 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB13. Supported peripheral buses: UART, SPI, I2C. |
| 12 | PB12 | Digital_IO | Signal terminal PB12 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB12. Supported peripheral buses: UART, I2C. |
| 13 | PB11 | Digital_IO | Signal terminal PB11 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB11. Supported peripheral buses: USB. |
| 14 | PB10 | Digital_IO | Signal terminal PB10 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB10. Supported peripheral buses: General. |
| 15 | PB7 | Digital_IO | Signal terminal PB7 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB7. Supported peripheral buses: UART, PWM. |
| 16 | PB6 | Digital_IO | Signal terminal PB6 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB6. Supported peripheral buses: UART, PWM. |
| 17 | PB5 | Digital_IO | Signal terminal PB5 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB5. Supported peripheral buses: UART. |
| 18 | PB4 | Digital_IO | Signal terminal PB4 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB4. Supported peripheral buses: UART, PWM. |
| 19 | PB5/DTR | Digital_IO | Signal terminal PB5/DTR (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB5/DTR. Supported peripheral buses: UART. |
| 20 | PB22 | Digital_IO | Signal terminal PB22 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB22. Supported peripheral buses: UART. |
| 21 | PB3/DCD/PWM9 | Digital_IO | Signal terminal PB3/DCD/PWM9 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB3/DCD/PWM9. Supported peripheral buses: PWM. |
| 22 | X32MI | Digital_IO | Signal terminal X32MI (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: X32MI. Supported peripheral buses: General. |
| 23 | VINTA | Power_In | Primary positive power supply input (VINTA) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 24 | ANT | RF_50Ohm | Signal terminal ANT (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: ANT. Supported peripheral buses: General. |
| 25 | VDCIA | Digital_IO | Signal terminal VDCIA (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: VDCIA. Supported peripheral buses: General. |
| 26 | PB22/TMR3/RXD2 | Digital_IO | Signal terminal PB22/TMR3/RXD2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB22/TMR3/RXD2. Supported peripheral buses: UART. |
| 27 | PB21/SCL_/TXD3 | Digital_IO | Signal terminal PB21/SCL_/TXD3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB21/SCL_/TXD3. Supported peripheral buses: UART, I2C. |
| 28 | PB20/SDA_/RXD3 | Digital_IO | Signal terminal PB20/SDA_/RXD3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB20/SDA_/RXD3. Supported peripheral buses: UART, I2C. |
| 29 | PB19 | Digital_IO | Signal terminal PB19 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB19. Supported peripheral buses: General. |
| 30 | PB18 | Digital_IO | Signal terminal PB18 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PB18. Supported peripheral buses: General. |
| 31 | PA12 | Digital_IO | Signal terminal PA12 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA12. Supported peripheral buses: PWM. |
| 32 | PA11 | Digital_IO | Signal terminal PA11 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA11. Supported peripheral buses: General. |
| 33 | VINTA | Power_In | Primary positive power supply input (VINTA) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 34 | ANT | RF_50Ohm | Signal terminal ANT (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: ANT. Supported peripheral buses: General. |
| 35 | VDCIA | Digital_IO | Signal terminal VDCIA (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: VDCIA. Supported peripheral buses: General. |
| 36 | PA4/RXD3/LEDC/A0 | Digital_IO | Signal terminal PA4/RXD3/LEDC/A0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA4/RXD3/LEDC/A0. Supported peripheral buses: UART. |
| 37 | PA5/TXD3/LED4/A1 | Digital_IO | Signal terminal PA5/TXD3/LED4/A1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA5/TXD3/LED4/A1. Supported peripheral buses: UART. |
| 38 | IO38 | Digital_IO | General Purpose Digital I/O Pin IO38 |
| 39 | PA0/SCK1/LED0/A9 | Digital_IO | Signal terminal PA0/SCK1/LED0/A9 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI. Supported peripheral buses: SPI. |
| 40 | PA1/MOSI1/LED1/A8 | Digital_IO | Signal terminal PA1/MOSI1/LED1/A8 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI. Supported peripheral buses: SPI. |
| 41 | IO41 | Digital_IO | General Purpose Digital I/O Pin IO41 |
| 42 | PA3/LED3/A6 | Digital_IO | Signal terminal PA3/LED3/A6 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA3/LED3/A6. Supported peripheral buses: General. |
| 43 | PA15/MISO/RXD0_/A5 | Digital_IO | Signal terminal PA15/MISO/RXD0_/A5 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI. Supported peripheral buses: UART, SPI. |
| 44 | PA14/MOSI/TXD0_/A4 | Digital_IO | Signal terminal PA14/MOSI/TXD0_/A4 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI. Supported peripheral buses: UART, SPI. |
| 45 | PA13/SCK0/PWM5/A3 | Digital_IO | Signal terminal PA13/SCK0/PWM5/A3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI. Supported peripheral buses: SPI, PWM. |
| 46 | PA12/SCS/PWM4/A2 | Digital_IO | Signal terminal PA12/SCS/PWM4/A2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA12/SCS/PWM4/A2. Supported peripheral buses: PWM. |
| 47 | PA11/X32KO/TMR2 | Digital_IO | Signal terminal PA11/X32KO/TMR2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA11/X32KO/TMR2. Supported peripheral buses: General. |
| 48 | PA10/X32KI/TMR1 | Digital_IO | Signal terminal PA10/X32KI/TMR1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PA10/X32KI/TMR1. Supported peripheral buses: General. |
| 49 | GND | GND | Bottom exposed die attach pad (GND) providing primary thermal conduction path to the PCB and low-inductance 0V ground return. |









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