Bms core
About the Bms core PCB
Bms core is an open source STM32 PCB design by olin-electric-motorsports, published on GitHub under the MIT license. It is a 4-layer board measuring 109.8 × 25.1 mm, with 61 components from 36 distinct parts.
Its main chip is the STM32G441KBT6, from the STM32 family. Other key parts include the MCP6001T-I/OT, LTC6820HMS#TRPBFCT-ND, 296-9847-1-ND and MCP2561-E/SN. By type, the board carries 21 resistors, 18 capacitors, 9 ICs, 5 diodes, 4 connectors and 1 transistor.
It belongs with the power & battery designs in this gallery.
From the project
This monorepo centralizes Olin Electric Motorsports’ KiCad designs and STM32 firmware into a single place. It helps with immediate contribution through standardized environments and automated CAN signal tracking. This unified structure makes sure that there is architectural consistency across all vehicle electrical systems.
Welcome to the Olin Electric Motorsports monorepo. This is the home for all of our electrical, firmware, and software work.
This document will help you get started contributing and walk you through important steps for working on the team.
If you are on a completely fresh Ubuntu computer, you won't have the tools needed to download this repository yet. Open your terminal (Ctrl + Alt + T) and run these commands one by one to install Git and clone our code:
Main components on the Bms core
Bms core bill of materials (BOM)
61 components, 36 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 5 | MCP6001T-I/OT MCP6001 | SOT-353_SC-70-5 | U1, U4, U5, U6, U8 |
| 1 | LTC6820HMS#TRPBFCT-ND LTC6820HMS | MSOP-16_3x4mm_P0.5mm | U3 |
| 1 | 296-9847-1-ND SN74LVC1G32DBVR | SOT-23-5_OEM | U7 |
| 1 | STM32G441KBT6 | LQFP-32_7x7mm_P0.8mm | U10 |
| 1 | MCP2561-E/SN MCP2561-E_SN | SOIC-8_3.9x4.9mm_P1.27mm | U11 |
| 1 | SSM3K333RLFCT-ND SSM3K333R | SOT-23F | Q1 |
| 1 | FA-238 16.0000MB-C0 X_16MHz_18pF | FA238160000MBC0 (X_16MHz_18pF_SMD - FA-238_16.0000MB-C0) | Y3 |
| 1 | isoSPI Header | PinHeader_2x03_P2.54mm_Vertical | J1 |
| 1 | WM1865-ND MicroFit_RA_2 | MicroFit_RA_2 | J3 |
| 1 | J_Programming_Pin_Header | J_Programming_Pin_Header_Keyed | J4 |
| 1 | 2-1761465-1 J_PCIe_x1 | J_PCIe_x1_Key | J5 |
| 1 | G5Q-1A4 DC5 Relay_G5Q-1A4-DC5 | Relay_SPST_OMRON-G5Q-1A4_OEM | K1 |
| 1 | HM2112ZNLT | HM2112ZNLT | T1 |
| 1 | LED_AMBER | CHIPLED_0805 | D1 |
| 1 | LED_GREEN | CHIPLED_0805 | D2 |
| 1 | LED_RED | CHIPLED_0805 | D3 |
| 1 | SMBJ5355B-TP D_Zener_18V_SMBJ5355B-TP | DO-214AA | D5 |
| 1 | LTST-C171TBKT LED_BLUE | CHIPLED_0805 | D6 |
| 5 | C0603C104Z4VACTU C_0.1uF_16V | C_0603_1608Metric | C1, C16, C17, C21, C22 |
| 6 | 478-3352-1-ND C_0.1uF | C_0603 | C6, C9, C10, C11, C12, C13 |
Show 16 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 1276-1015-1-ND C_10nF | C_0603 | C7, C8 |
| 2 | CML0603C0G300JT50V C_30pF_50V | C_0603_1608Metric | C14, C15 |
| 1 | GRT188R61E475ME13D C_4.7uF_25V | C_0603_1608Metric | C18 |
| 1 | CL10B103KB8NNNC C_10nF_50V | C_0603_1608Metric | C19 |
| 1 | CL10B105KA8NNNC C_1uF_25V | C_0603_1608Metric | C20 |
| 4 | RMCF0603FT1K00 1KR | R_0603 | R1, R3, R21, R23 |
| 1 | CR0603AFX-5101EAS R_5.1k | R_0603_1608Metric | R2 |
| 1 | RMCF0603FT10K0 R_10k | R_0603_1608Metric | R4 |
| 1 | RC0603FR-13120RL R_120 | R_0603_1608Metric | R5 |
| 5 | CRS0805-FX-1002ELFCT-ND R_10K | R_0603 | R7, R12, R15, R16, R19 |
| 3 | RNCP0805FTD1K00CT-ND R_1K | R_0603 | R8, R9, R18 |
| 2 | P60.4DACT-ND R_60.4 | R_0603 | R10, R11 |
| 1 | RMCF0805JT1M00CT-ND R_1M | R_0603 | R17 |
| 1 | RMCF0603FT576R R_576 | R_0603 | R20 |
| 1 | RMCF0805JT1M00CT-ND R_10K | R_0603 | R24 |
| 1 | RNCP0805FTD1K00CT-ND R_10K | R_0603 | R25 |
Bms core design files
The KiCad project lives in the olin-electric-motorsports/oem-monorepo repository on GitHub; these links point at the commit this page was built from.
Bms core: common questions
What microcontroller does the Bms core use?
The Bms core is built around the STM32G441KBT6, from the STM32 family.
How big is the Bms core PCB?
The Bms core measures 109.8 × 25.1 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Bms core?
61 components, from 36 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 Bms core design files?
From the olin-electric-motorsports/oem-monorepo repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Bms core design in my own project?
Yes, under the terms of its MIT license, which olin-electric-motorsports chose for the repository.
Can I test firmware for the Bms core 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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