2 layers34 × 50 mm
4 layers120 × 65 mm
Bms segment
york-fs/bms-segmentBattery Management System Segment
- Size
- 120 × 65 mm
- Copper layers
- 4
- Thickness
- 1.61 mm
- Parts
- 206
- Nets
- 240
- Pads
- 801
- Tracks, vias
- 1,594, 537
- Pours
- 16
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 4 Feb 2025
- Updated
- 3 Jul 2026
Overview
Bms segment is an open-source printed circuit board by york-fs, from the york-fs/bms-segment repository on GitHub. It is a 4-layer board of 120 × 65 mm with 206 parts on 240 nets, routed with 1,594 tracks and 537 vias.
It is built around the ADUM1252AWA+, MAX14921ECS+ and IRLML0060, with the BYG20J and BSS84 among its other parts. Its parts include 53 resistors, 49 capacitors, 20 diodes, 17 transistors and 9 ICs. It belongs with the power boards and the STM32 boards of this library.
Main components
5
ADUM1252AWA+
SOIC-8Bidirectional automatic direction、Open-drain buffer output、Hotswap、Clock stretching、Multi-voltage domain interface SOIC-8 I2C Isolators ROHSMaxim Integrated (Analog Devices)I2C Isolators
MAX14921ECS+
TQFP-80(12x12)16 TQFP-80(12x12) Analog Front End (AFE) ROHSMaxim Integrated (Analog Devices)Battery Management
IRLML0060
SOT-23-55℃~+150℃ 1 N-channel 1.2V 2.5nC@4.5V 2.7A 21pF 290pF 37pF 60V 80mΩ@10V N-Channel SOT-23 MOSFETs ROHSGuangdong HottechMOSFETs
BYG20J
SMAFast Recovery / High Efficiency DiodesLGEBSS84
SOT-23-55℃~+150℃ 1 P-Channel 130mA 2.8pF 24.6pF 2V 3.2Ω@5V 300mW 4.7pF 50V 590pC@10V SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETs
README
README.mdBattery Management System Segment Board
The BMS segment board is part of the car's distributed BMS design. It connects to a series string of up to 16 cells and connects over an isolated I2C interface to the BMS master board to transfer cell voltage and temperature measurements.
Latest Release Interactive BOM
Features
- Up to 16-Cell Voltage Measurement Frontend with Passive Balancing
- Utilises the MAX14921 analog frontend IC
- Buck Converter to Derive On-Board Power From the Connected Segment
- Around 120 uA quiescent current consumption in standby
- Isolated I2C Communication to the Master Board
- Up to 24 Connected Thermistors
- Four onboard thermistors spread across the cell balancers
- Twenty external thermistors across two JST PUD connectors
- Short Circuit Protection on the External Thermistors
- Daughter Board Design for Connecting Cell Taps
- Allows any cell tap connector to be used and the ability to use any cell count between 3 and 16
Cloning
A recursive clone must be used to download the kicad-library repository:
git clone --recursive https://github.com/york-fs/bms-segment.gitParts
206| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 330 | Resistor_SMD:R_0603_1608Metric | R29, R32, R35, R38, R41, R44, R47, R50, R53, R56, R59, R62, R65, R68, R71, R74 +1 |
| 17 | LED_Small | LED_SMD:LED_0603_1608Metric | D1, D2, D3, D4, D5, D6, D7, D8, D10, D11, D12, D13, D14, D15, D16, D17 +1 |
| 16 | 1u | Capacitor_SMD:C_0805_2012Metric | C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27 |
| 16 | 20 | Resistor_SMD:R_2512_6332Metric | R28, R31, R34, R37, R40, R43, R46, R49, R52, R55, R58, R61, R64, R67, R70, R73 |
| 16 | IRLML0060 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, Q16 |
| 13 | 10k | Resistor_SMD:R_0603_1608Metric | R23, R24, R26, R75, R76, R78, R79, R80, R81, TH1, TH2, TH3, TH4 |
| 12 | 10k | Resistor_SMD:R_Array_Convex_4x1206 | RN1, RN2, RN3, RN4, RN5, RN6, RN7, RN8, RN9, RN10, RN11, RN12 |
| 12 | 1u | Capacitor_SMD:C_0603_1608Metric | C9, C10, C32, C35, C36, C37, C38, C39, C43, C47, C48, C49 |
| 11 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11 |
| 8 | 3k | Resistor_SMD:R_Array_Concave_4x0603 | RN13, RN14, RN15, RN16, RN17, RN18, RN19, RN20 |
| 7 | 100n | Capacitor_SMD:C_0603_1608Metric | C4, C29, C30, C31, C40, C41, C42 |
| 5 | TestPoint_2Pole | yfs:TestPoint_2Pads_Pitch2.54mm_Drill1.0mm | TP1, TP2, TP3, TP4, TP5 |
| 4 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2, JP3, JP4 |
| 3 | 1n | Capacitor_SMD:C_0603_1608Metric | C44, C45, C46 |
| 3 | 22u | Capacitor_SMD:C_1210_3225Metric | C6, C7, C8 |
| 3 | 74LV4051A | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U7, U8, U9 |
| 3 | BYG20J | Diode_SMD:D_SMA | D18, D19, D20 |
| 2 | 100n | Capacitor_SMD:C_1206_3216Metric | C3, C11 |
| 2 | 10u | Capacitor_SMD:C_1206_3216Metric | C33, C34 |
| 2 | Conn_01x04 | yfs:MolexMicrofitPlus2x2-RA | J4, J5 |
| 2 | Conn_02x10_Odd_Even | Connector_JST:JST_PUD_S20B-PUDSS-1_2x10_P2.00mm_Horizontal | J2, J3 |
| 2 | LOGO | LOGO | G***, G**** |
| 2 | Polyfuse | Resistor_SMD:R_1206_3216Metric | F1, F2 |
| 1 | 100p | Capacitor_SMD:C_0603_1608Metric | C28 |
| 1 | 10M | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 220 | Inductor_SMD:L_0603_1608Metric | FB2 |
| 1 | 220 | Resistor_SMD:R_0603_1608Metric | R25 |
| 1 | 22u | Inductor_SMD:L_Vishay_IHLP-2525 | L1 |
| 1 | 22u | Capacitor_SMD:CP_Elec_6.3x7.7 | C1 |
| 1 | 24k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 2u2 | Capacitor_SMD:C_1210_3225Metric | C2 |
| 1 | 390k | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 600 | Inductor_SMD:L_0603_1608Metric | FB1 |
| 1 | 6R8 | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 75k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | ? | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | ? | Capacitor_SMD:C_0603_1608Metric | C5 |
| 1 | ADuM1252 | Package_SO:MSOP-8_3x3mm_P0.65mm | U6 |
| 1 | BSS84 | Package_TO_SOT_SMD:SOT-23 | Q17 |
| 1 | Conn_01x06 | yfs:IDC-Connector-2x3 | J6 |
| 1 | Conn_02x17_Counter_Clockwise | yfs:SAMTEC_TW-17-03-F-D-275-090 | J1 |
| 1 | G*** | kibuzzard-69D2F3F3 | kibuzzard-69D2F3F3 |
| 1 | G*** | kibuzzard-69EF73A7 | kibuzzard-69EF73A7 |
| 1 | G*** | kibuzzard-69D1B272 | kibuzzard-69D1B272 |
| 1 | LMR516xx | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | MAX11163 | Package_SO:MSOP-10_3x3mm_P0.5mm | U3 |
| 1 | MAX14921 | Package_QFP:TQFP-80_12x12mm_P0.5mm | U2 |
| 1 | REF61xx | Package_SO:VSSOP-8_3x3mm_P0.65mm | U4 |
| 1 | STM32F103C8Tx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U5 |
| 1 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_NO_Vertical_Wuerth_434133025816 | SW1 |
| 1 | TestPoint | TestPoint:TestPoint_Keystone_5019_Miniature | TP6 |
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Questions
How big is the Bms segment PCB?
It measures 120 × 65 mm and has 4 copper layers, 1.61 mm thick.
What parts does the Bms segment use?
206 parts, built around the ADUM1252AWA+, MAX14921ECS+, IRLML0060 and BYG20J. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Bms segment KiCad files?
From the york-fs/bms-segment repository on GitHub, at the commit this page was made from: the board is bms_segment.kicad_pcb and its schematic balance.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bms segment design in my own project?
Its repository states no licence, so its author keeps all rights: ask york-fs before reusing the design.