Mechanical Dimensions & Land Pattern (LQFP-64(7x7))
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 LQFP-64(7x7) | Size power & signal trace widths for rated load current following IPC-2221 clearance rules. |
Technical Frequently Asked Questions (FAQ) — CH545L (LQFP-64(7x7))
Quick answers covering Pinout, IPC-7351B Land Pattern dimensions, and CAD export formatsWhat is the Pinout and operating voltage specification of CH545L (LQFP-64(7x7))?
Manufactured by WCH, the CH545L is housed in a LQFP-64(7x7) package with 64 pins and a 0.40 mm lead pitch. Key pins include: 1 (SCK/TXD1 /AIN7_: Multiplexed I/O & Peripheral Pin SCK/TXD1 /AIN7_ (UART, SPI, ADC)), 2 (P6.0/DM0: Multiplexed I/O & Peripheral Pin P6.0/DM0 (General)), 3 (P6.1/DP0: Multiplexed I/O & Peripheral Pin P6.1/DP0 (General)), 4 (P6.2/DM1: Multiplexed I/O & Peripheral Pin P6.2/DM1 (General)), 5 (P6.3/DP1: Multiplexed I/O & Peripheral Pin P6.3/DP1 (General)), 6 (P6.4/DM2: Multiplexed I/O & Peripheral Pin P6.4/DM2 (General)).
What are the IPC-7351B PCB Footprint dimensions for CH545L?
Normalized from the official datasheet mechanical drawing per IPC-7351B (Density Level B Nominal), CH545L (LQFP-64(7x7)) has a nominal body envelope of 7.00 × 7.00 mm, pitch e = 0.40 mm, and 64 copper pads.
Where can I download KiCad (.kicad_mod, .kicad_sym), Fusion 360 (.lbr), and 3D STEP models for CH545L?
You can download the verified open-hardware (CERN-OHL-P-2.0) CAD library bundle for CH545L (WCH, LQFP-64(7x7)) 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 (64 pins) & CH545 Family VariantsExpand static table
| Pin # | Signal Name | Electrical Type | Functional Description & Design Notes |
|---|---|---|---|
| 1 | SCK/TXD1 /AIN7_ | Digital_IO | Signal terminal SCK/TXD1 /AIN7_ (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SCK/TXD1 /AIN7_. Supported peripheral buses: UART, SPI, ADC. |
| 2 | P6.0/DM0 | Digital_IO | Signal terminal P6.0/DM0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P6.0/DM0. Supported peripheral buses: General. |
| 3 | P6.1/DP0 | Digital_IO | Signal terminal P6.1/DP0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P6.1/DP0. Supported peripheral buses: General. |
| 4 | P6.2/DM1 | Digital_IO | Signal terminal P6.2/DM1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P6.2/DM1. Supported peripheral buses: General. |
| 5 | P6.3/DP1 | Digital_IO | Signal terminal P6.3/DP1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P6.3/DP1. Supported peripheral buses: General. |
| 6 | P6.4/DM2 | Digital_IO | Signal terminal P6.4/DM2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P6.4/DM2. Supported peripheral buses: General. |
| 7 | P6.5/DP2 | Digital_IO | Signal terminal P6.5/DP2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P6.5/DP2. Supported peripheral buses: General. |
| 8 | P6.6/DM3 | Digital_IO | Signal terminal P6.6/DM3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P6.6/DM3. Supported peripheral buses: General. |
| 9 | P6.7/DP3 | Digital_IO | Signal terminal P6.7/DP3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P6.7/DP3. Supported peripheral buses: General. |
| 10 | P3.0/RXD | Digital_IO | Signal terminal P3.0/RXD (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P3.0/RXD. Supported peripheral buses: UART. |
| 11 | P4.5 | Digital_IO | Signal terminal P4.5 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P4.5. Supported peripheral buses: General. |
| 12 | P4.4 | Digital_IO | Signal terminal P4.4 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P4.4. Supported peripheral buses: General. |
| 13 | P3.1/TXD | Digital_IO | Signal terminal P3.1/TXD (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P3.1/TXD. Supported peripheral buses: UART. |
| 14 | P3.2/INT0 | Digital_IO | Signal terminal P3.2/INT0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P3.2/INT0. Supported peripheral buses: General. |
| 15 | P3.3/INT1/MSCL | Digital_IO | Signal terminal P3.3/INT1/MSCL (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P3.3/INT1/MSCL. Supported peripheral buses: General. |
| 16 | P3.4/T0/MSDA | Digital_IO | Signal terminal P3.4/T0/MSDA (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P3.4/T0/MSDA. Supported peripheral buses: General. |
| 17 | P3.5/T1/MOSI1 | Digital_IO | Signal terminal P3.5/T1/MOSI1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P3.5/T1/MOSI1. Supported peripheral buses: SPI. |
| 18 | P3.6/MISO1 | Digital_IO | Signal terminal P3.6/MISO1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P3.6/MISO1. Supported peripheral buses: SPI. |
| 19 | P3.7/SCK1 | Digital_IO | Signal terminal P3.7/SCK1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P3.7/SCK1. Supported peripheral buses: SPI. |
| 20 | P4.3 | Digital_IO | Signal terminal P4.3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P4.3. Supported peripheral buses: General. |
| 21 | P4.2 | Digital_IO | Signal terminal P4.2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P4.2. Supported peripheral buses: General. |
| 22 | P4.6 | Digital_IO | Signal terminal P4.6 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P4.6. Supported peripheral buses: General. |
| 23 | P4.7 | Digital_IO | Signal terminal P4.7 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P4.7. Supported peripheral buses: General. |
| 24 | VDD | Power_In | Primary positive power supply input (VDD) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 25 | GND/VSS | GND | 0V electrical ground return terminal (GND/VSS) for internal core logic, I/O drivers, and analog sub-blocks. |
| 26 | P7.0/XI/PWM1_ | Digital_IO | Signal terminal P7.0/XI/PWM1_ (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P7.0/XI/PWM1_. Supported peripheral buses: PWM, RTC/CLK. |
| 27 | P7.1/XO/RST#/ALE_ | Digital_IO | Signal terminal P7.1/XO/RST#/ALE_ (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P7.1/XO/RST#/ALE_. Supported peripheral buses: RTC/CLK. |
| 28 | DCO | Digital_IO | Signal terminal DCO (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: DCO. Supported peripheral buses: General. |
| 29 | P4.1 | Digital_IO | Signal terminal P4.1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P4.1. Supported peripheral buses: General. |
| 30 | P4.0 | Digital_IO | Signal terminal P4.0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P4.0. Supported peripheral buses: General. |
| 31 | PWM5 | Digital_IO | Signal terminal PWM5 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PWM5. Supported peripheral buses: PWM. |
| 32 | PWM4 | Digital_IO | Signal terminal PWM4 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PWM4. Supported peripheral buses: PWM. |
| 33 | PWM3 | Digital_IO | Signal terminal PWM3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PWM3. Supported peripheral buses: PWM. |
| 34 | P2.3/PWM2 | Digital_IO | Signal terminal P2.3/PWM2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P2.3/PWM2. Supported peripheral buses: PWM. |
| 35 | IO35 | Digital_IO | General Purpose Digital I/O Pin IO35 |
| 36 | P2.5/PWM0/T2EX_/CAP2_ | Digital_IO | Signal terminal P2.5/PWM0/T2EX_/CAP2_ (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P2.5/PWM0/T2EX_/CAP2_. Supported peripheral buses: PWM. |
| 37 | P2.6/RXD1 | Digital_IO | Signal terminal P2.6/RXD1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P2.6/RXD1. Supported peripheral buses: UART. |
| 38 | P2.7/TXD1 | Digital_IO | Signal terminal P2.7/TXD1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P2.7/TXD1. Supported peripheral buses: UART. |
| 39 | P5.7/HP3 | Digital_IO | Signal terminal P5.7/HP3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P5.7/HP3. Supported peripheral buses: General. |
| 40 | P5.6/HM3 | Digital_IO | Signal terminal P5.6/HM3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P5.6/HM3. Supported peripheral buses: General. |
| 41 | P5.5/HP2 | Digital_IO | Signal terminal P5.5/HP2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P5.5/HP2. Supported peripheral buses: General. |
| 42 | P5.4/HM2 | Digital_IO | Signal terminal P5.4/HM2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P5.4/HM2. Supported peripheral buses: General. |
| 43 | P5.3/HP1 | Digital_IO | Signal terminal P5.3/HP1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P5.3/HP1. Supported peripheral buses: General. |
| 44 | P5.2/HM1/ALE | Digital_IO | Signal terminal P5.2/HM1/ALE (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P5.2/HM1/ALE. Supported peripheral buses: General. |
| 45 | P5.1/DP/HP0 | Digital_IO | Signal terminal P5.1/DP/HP0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P5.1/DP/HP0. Supported peripheral buses: General. |
| 46 | P5.0/DM/HM0 | Digital_IO | Signal terminal P5.0/DM/HM0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: P5.0/DM/HM0. Supported peripheral buses: General. |
| 47 | SDA3 | Digital_IO | Signal terminal SDA3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SDA3. Supported peripheral buses: I2C. |
| 48 | SCL3 | Digital_IO | Signal terminal SCL3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SCL3. Supported peripheral buses: I2C. |
| 49 | SDA2/AIN13 | Digital_IO | Signal terminal SDA2/AIN13 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SDA2/AIN13. Supported peripheral buses: I2C, ADC. |
| 50 | SCL2/AIN12 | Digital_IO | Signal terminal SCL2/AIN12 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SCL2/AIN12. Supported peripheral buses: I2C, ADC. |
| 51 | SDA1/TXD /AIN11_ | Digital_IO | Signal terminal SDA1/TXD /AIN11_ (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SDA1/TXD /AIN11_. Supported peripheral buses: UART, I2C, ADC. |
| 52 | SCL1/RXD /AIN10_ | Digital_IO | Signal terminal SCL1/RXD /AIN10_ (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SCL1/RXD /AIN10_. Supported peripheral buses: UART, I2C, ADC. |
| 53 | SDA0/AIN9 | Digital_IO | Signal terminal SDA0/AIN9 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SDA0/AIN9. Supported peripheral buses: I2C, ADC. |
| 54 | SCL0/AIN8 | Digital_IO | Signal terminal SCL0/AIN8 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SCL0/AIN8. Supported peripheral buses: UART, I2C, ADC. |
| 55 | VDD | Power_In | Primary positive power supply input (VDD) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 56 | GND/VSS | GND | 0V electrical ground return terminal (GND/VSS) for internal core logic, I/O drivers, and analog sub-blocks. |
| 57 | V3 | Power_Out | Regulated power output rail (V3) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 58 | T2/CAP1/AIN0 | Analog | Signal terminal T2/CAP1/AIN0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SPI0. Supported peripheral buses: SPI, ADC. |
| 59 | T2EX/CAP2/AIN1 | Analog | Signal terminal T2EX/CAP2/AIN1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: T2EX/CAP2/AIN1. Supported peripheral buses: ADC. |
| 60 | INT0 /AIN2_ | Analog | Signal terminal INT0 /AIN2_ (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: INT0 /AIN2_. Supported peripheral buses: ADC. |
| 61 | AIN3 | Analog | Signal terminal AIN3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: AIN3. Supported peripheral buses: ADC. |
| 62 | SCS/AIN4 | Analog | Signal terminal SCS/AIN4 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SCS/AIN4. Supported peripheral buses: ADC. |
| 63 | MOSI/PWM0 /AIN5_ | Digital_IO | Signal terminal MOSI/PWM0 /AIN5_ (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: MOSI/PWM0 /AIN5_. Supported peripheral buses: SPI, ADC, PWM. |
| 64 | MISO/RXD1 /AIN6_ | Digital_IO | Signal terminal MISO/RXD1 /AIN6_ (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: MISO/RXD1 /AIN6_. Supported peripheral buses: UART, SPI, ADC. |





