PAC5523
About the PAC5523 PCB
PAC5523 is an open source STM32 PCB design by Jana-Marie, published on GitHub under the CERN-OHL-1.2 license. It is a 4-layer board measuring 60 × 44 mm, with 126 components from 64 distinct parts.
Its main chip is the STM32G431CBUX, from the STM32 family. Other key parts include the MAX3051, ACT4088, XL7015, RS485 and MIC4605. By type, the board carries 41 capacitors, 41 resistors, 19 diodes, 11 ICs, 11 connectors and 2 transistors.
It belongs with the robotics & motion designs in this gallery.
From the project
Next generation of OtterControl.
Main components on the PAC5523
PAC5523 bill of materials (BOM)
126 components, 64 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32G431CBUX PAC5523 | QFN-48-1EP_6x6mm_P0.4mm_EP4.2x4.2mm | U1 |
| 1 | MAX3051 | SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | ACT4088 | SOT-23-6 | U3 |
| 1 | XL7015 Oscillator_3225 | Oscillator_3225 | U4 |
| 1 | RS485 | SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | MIC4605 ENCODER A | SOIC-8_3.9x4.9mm_P1.27mm | U6 |
| 1 | MIC4605 ENCODER B | SOIC-8_3.9x4.9mm_P1.27mm | U7 |
| 3 | USBLC6-4 | SOT-23-6 | U8, U9, U11 |
| 1 | MIC4605 PA1137NL | PA1137NL | U10 |
| 1 | AON6276 | VSONP-8-1EP_5x6_P1.27mm | Q1 |
| 1 | C8545 Q_NMOS_GSD | SOT-23 | Q2 |
| 1 | W | PinHeader_1x06_P2.00mm_Vertical_COMBI | J1 |
| 1 | U | PinHeader_1x06_P2.00mm_Vertical_COMBI | J2 |
| 1 | V | PinHeader_1x06_P2.00mm_Vertical_COMBI | J3 |
| 1 | GND | PinHeader_1x03_P2.00mm_Vertical_COMBI | J4 |
| 1 | VIN | PinHeader_1x03_P2.00mm_Vertical_COMBI | J5 |
| 1 | UART | Molex_PicoBlade_53261-0471_1x04-1MP_P1.25mm_Horizontal | J6 |
| 1 | ENCODER | Molex_PicoBlade_53261-0671_1x06-1MP_P1.25mm_Horizontal | J7 |
| 1 | HALL | Molex_PicoBlade_53261-0571_1x05-1MP_P1.25mm_Horizontal | J8 |
| 1 | AIN | Molex_PicoBlade_53261-0371_1x03-1MP_P1.25mm_Horizontal | J9 |
Show 44 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | NTC | Molex_PicoBlade_53261-0271_1x02-1MP_P1.25mm_Horizontal | J10 |
| 1 | LED | Molex_PicoBlade_53261-0371_1x03-1MP_P1.25mm_Horizontal | J11 |
| 1 | SS310 | D_SOD-123F | D1 |
| 6 | B5819W SS310 | D_SOD-123F | D2, D5, D6, D7, D10, D13 |
| 8 | SM4007PL SS310 | D_SOD-123F | D3, D4, D8, D9, D11, D12, D14, D15 |
| 3 | SS310 | D_SOD-123F | D16, D18, D19 |
| 1 | SK6812MINI | LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | D17 |
| 1 | 4U7 4u7 | L_Taiyo-Yuden_MD-4040 | L1 |
| 3 | 22UF 1uF | C_0805_2012Metric | C1, C11, C12 |
| 6 | TBD | C_0603_1608Metric | C2, C3, C13, C14, C15, C16 |
| 2 | 18P 100n | C_0603_1608Metric | C4, C5 |
| 2 | 100N 4u7 | C_0603_1608Metric | C6, C22 |
| 1 | C106678 4u7 | C_0603_1608Metric | C7 |
| 3 | 4U7 4u7 | C_0603_1608Metric | C8, C9, C10 |
| 1 | 4U7 100p | C_0603_1608Metric | C17 |
| 1 | 100N 100p | C_0603_1608Metric | C18 |
| 7 | 100P 100p | C_0603_1608Metric | C19, C29, C30, C31, C39, C40, C42 |
| 1 | 33N 10u | C_1206_3216Metric | C20 |
| 2 | 100n | C_0603_1608Metric | C21, C34 |
| 1 | 10U 100n | C_0603_1608Metric | C23 |
| 7 | 100N 100n | C_0603_1608Metric | C24, C25, C26, C27, C28, C35, C37 |
| 1 | 100N 1n | C_0603_1608Metric | C32 |
| 1 | 100N 10u | C_1206_3216Metric | C33 |
| 1 | 10U 10u | C_1206_3216Metric | C36 |
| 1 | 10U 18p | C_0603_1608Metric | C41 |
| 2 | 22K 5.1 | R_0603_1608Metric | R1, R8 |
| 6 | 10 | R_0805_2012Metric | R2, R3, R10, R11, R12, R13 |
| 4 | 100 | R_0603_1608Metric | R4, R5, R39, R45 |
| 4 | 100K 100k | R_0603_1608Metric | R6, R23, R25, R30 |
| 1 | 2.7K 51 | R_0603_1608Metric | R7 |
| 1 | 2.2K 5.1 | R_0603_1608Metric | R9 |
| 1 | 22K 0.3 | R_0805_2012Metric | R14 |
| 1 | 2.2K 10 | R_0805_2012Metric | R15 |
| 1 | 22K 0 | R_0603_1608Metric | R16 |
| 5 | 4K3 4k3 | R_0603_1608Metric | R17, R24, R26, R31, R32 |
| 2 | 120 | R_0603_1608Metric | R18, R22 |
| 1 | 60 | R_0603_1608Metric | R19 |
| 2 | 47K 47k | R_0603_1608Metric | R20, R37 |
| 1 | 1M | R_0603_1608Metric | R21 |
| 3 | 1.8K 100 | R_0603_1608Metric | R27, R28, R29 |
| 3 | 10K 1k | R_0603_1608Metric | R33, R34, R35 |
| 1 | 2.2K 220 | R_0603_1608Metric | R36 |
| 1 | 9K1 9k1 | R_0603_1608Metric | R38 |
| 1 | 1k | R_0603_1608Metric | R46 |
PAC5523 design files
The KiCad project lives in the Jana-Marie/OtterControlNG repository on GitHub; these links point at the commit this page was built from.
PAC5523: common questions
What microcontroller does the PAC5523 use?
The PAC5523 is built around the STM32G431CBUX, from the STM32 family.
How big is the PAC5523 PCB?
The PAC5523 measures 60 × 44 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the PAC5523?
126 components, from 64 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the PAC5523 design files?
From the Jana-Marie/OtterControlNG repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the PAC5523 design in my own project?
Yes, under the terms of its CERN-OHL-1.2 license, which Jana-Marie chose for the repository.
Can I test firmware for the PAC5523 without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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