4 layers100.3 × 50.3 mm
Greenmobi drive
G-Pereira/greenmobi-drive
A FOC motor drive compatible with VESC
160 parts1CERN-OHL-S-2.0
6 layers50 × 25 mm
Logic
LJBoxx/compaqt2Developpement module for vesc environnement
- Size
- 50 × 25 mm
- Copper layers
- 6
- Thickness
- 1.6 mm
- Parts
- 104
- Nets
- 94
- Pads
- 385
- Tracks, vias
- 740, 229
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 28 Jul 2026
- Updated
- 31 Jul 2026
Overview
Logic is an open-source printed circuit board by LJBoxx, from the LJBoxx/compaqt repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 6-layer board of 50 × 25 mm with 104 parts on 94 nets, routed with 740 tracks and 229 vias.
It is built around the TJA1051T/3/1, TPSM861257RDXR and AMS1117-3.3, with the BMI323 and LP5907MFX-3.3 among its other parts. Its parts include 56 capacitors, 19 resistors, 15 ICs, 5 diodes and 5 connectors. It belongs with the STM32 boards of this library.
Main components
5TJA1051T/3/1
-- CAN Transceivers ROHSNXP SemiconductorsCAN Transceivers
TPSM861257RDXR
QFN-FCMOD-7(3.3x4)-40℃~+125℃ 1.4MHz 1A 20mVp-p 2mm 3.3mm 370uA 3V~17V 4mm 600mV~5.5V 95% Buck Over Temperature Protection、Over Current Protection、Over Voltage Protection、Under Voltage Protection ±1.5% QFN-FCMOD-7(3.3x4) DC-DC Power Modules ROHSTexas InstrumentsDC-DC Power Modules
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BMI323
LGA-14-40℃~+85℃ IMU (accelerometer + gyroscope) Motion event detection LGA-14 Accelerometers ROHSBosch SensortecAccelerometers
LP5907MFX-3.3
SOT-23-5-40℃~+125℃@(Tj) 1 10uVrms 12uA 250mA 250mV@(250mA) 3.3V 5.5V 82dB@(1kHz) Fixed Positive Short Circuit Protection、Thermal shutdown、Enable control、Input under-voltage protection、Output discharge SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdCOMPAQT
This repository contains the kicad files (sources) for a project in which a custom developpement board was developped and integrated in one esc to serve as an example to whom want to develop their own esc based on VESC firmware
Docs
You will also find documentations on pinout of this board but also some guides on how to design your own esc, many thanks to the contributors of MP2 project which contains very crucial informations on mosfets and the powerstage parts but also to the VESC Discord community providing a great guide on designing a custom vesc in which this project does the heavy logic part.
License
This project is shared under the CERN-OHL-V2-S
Parts
104| Qty | Value | Footprint | References |
|---|---|---|---|
| 32 | 100n | Capacitor_SMD:C_0402_1005Metric | C3, C10, C15, C16, C17, C18, C19, C20, C24, C25, C27, C30, C31, C32, C33, C34 +16 |
| 8 | 2.2u | Capacitor_SMD:C_0603_1608Metric | C4, C5, C7, C9, C11, C12, C13, C14 |
| 6 | 1k | Resistor_SMD:R_0603_1608Metric | R3, R6, R7, R8, R14, R15 |
| 6 | MC74VHC1GT66 | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U2, U3, U4, U5, U6, U7 |
| 3 | 15n | Capacitor_SMD:C_0603_1608Metric | C21, C22, C23 |
| 3 | 1n | Capacitor_SMD:C_0603_1608Metric | C26, C28, C29 |
| 3 | 2.2u | Capacitor_SMD:C_1210_3225Metric | C39, C41, C52 |
| 3 | 5.1k | Resistor_SMD:R_0603_1608Metric | R24, R25, R26 |
| 3 | INA240/241 | Package_TO_SOT_SMD:SOT-23-8 | U8, U9, U10 |
| 3 | TestPoint | TestPoint:TestPoint_Pad_1.0x1.0mm | TP1, TP2, TP3 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R4, R5 |
| 2 | 10u | Capacitor_SMD:C_1210_3225Metric | C36, C45 |
| 2 | 15p | Capacitor_SMD:C_0402_1005Metric | C1, C2 |
| 2 | 220r | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | BZT52C3V6-7-F | Diode_SMD:D_SOD-123 | D4, D5 |
| 2 | Conn_01x24 | Library:castellated_1x24 | J1, J2 |
| 1 | 10.2k | Resistor_SMD:R_0603_1608Metric | R27 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | 100u | Capacitor_SMD:C_1206_3216Metric | C49 |
| 1 | 120ohm | Resistor_SMD:R_0603_1608Metric | R13 |
| 1 | 200k | Resistor_SMD:R_0603_1608Metric | R9 |
| 1 | 220k | Resistor_SMD:R_0603_1608Metric | R12 |
| 1 | 22p | Capacitor_SMD:C_0603_1608Metric | C43 |
| 1 | 30k | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | 33u | Capacitor_SMD:CP_Elec_4x5.4 | C42 |
| 1 | 8m | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U13 |
| 1 | BMI323 | Package_LGA:Bosch_LGA-14_3x2.5mm_P0.5mm | U15 |
| 1 | BOOT0 | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | J3 |
| 1 | Conn_01x10 | Library:castellated_1x10 | J5 |
| 1 | LP5907MFX-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U12 |
| 1 | NRST | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | J4 |
| 1 | STM32F405RGTx | Package_QFP:LQFP-64_10x10mm_P0.5mm | U1 |
| 1 | TJA1051T-3 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U14 |
| 1 | TPSM861257RDXR | easyeda2kicad:QFN-7_L4.0-W3.3_TPSM863257RDXR | U11 |
| 1 | blue | LED_SMD:LED_0603_1608Metric | D3 |
| 1 | green | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | red | LED_SMD:LED_0603_1608Metric | D2 |
Questions
How big is the Logic PCB?
It measures 50 × 25 mm and has 6 copper layers, 1.6 mm thick.
What parts does the Logic use?
104 parts, built around the TJA1051T/3/1, TPSM861257RDXR, AMS1117-3.3 and BMI323. 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 Logic KiCad files?
From the LJBoxx/compaqt repository on GitHub, at the commit this page was made from: the board is hardware/logic/logic.kicad_pcb and its schematic hardware/logic/can.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Logic design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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