Cm4 motherboard
About the Cm4 motherboard PCB
Cm4 motherboard is an open source Raspberry Pi PCB design by Twisted-Fields, published on GitHub. It is a 4-layer board measuring 118 × 117 mm, with 238 components from 109 distinct parts.
Its main chip is the ET6226M, from the Raspberry Pi family. Other key parts include the U74LVC1G125G-AL5-R, LM2576HVS-5.0/TR, TPD4E1U06DCKR, MSUSB30 and LTC4412ES6#TRPBF. By type, the board carries 64 resistors, 54 capacitors, 36 ICs, 31 diodes, 24 connectors and 10 transistors.
It belongs with the robotics & motion designs in this gallery.
From the project
PCB hardware designs in KICAD for Acorn, the precision farming rover from Twisted Fields.
This is the motherboard design used on Acorn, the precision farming rover from Twisted Fields.
This board provides motor control communication to four Odrive motor controllers via RS-485, e-stop control, motor power control, and more.
For more information please see http://community.twistedfields.com
Main components on the Cm4 motherboard
Cm4 motherboard bill of materials (BOM)
238 components, 109 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 12 | U74LVC1G125G-AL5-R SN74LVC1G07QDCKTQ1 UTC(Unisonic Tech) | SOT-353_SC-70-5 | U1, U2, U15, U18, U19, U22, U27, U29 +4 |
| 1 | LM2576HVS-5.0/TR LM2576HVS-5 HGSEMI | TO-263-5_TabPin3 | U3 |
| 2 | TPD4E1U06DCKR Texas Instruments | SOT-363_SC-70-6 | U4, U23 |
| 2 | MSUSB30 ISL54222AIUZ Hangzhou Ruimeng Tech | ISL54222AIUZ | U5, U24 |
| 1 | LTC4412ES6#TRPBF LTC4412xS6 Analog Devices | TSOT-23-6 | U6 |
| 1 | TXS0101DCKR Texas Instruments | SOT-363_SC-70-6 | U7 |
| 2 | MCP2515T-I/SO MCP2515-xSO Microchip Tech | SOIC-18W_7.5x11.6mm_P1.27mm | U8, U9 |
| 2 | CA-IS3050G isolator Chipanalog | SOIC-8_7.5x5.85mm_P1.27mm | U10, U11 |
| 1 | TPS61040DBVR Texas Instruments | SOT-753 | U12 |
| 2 | SC16IS752IPW,128 SC16IS752 NXP Semicon | TSSOP-28_4.4x9.7mm_P0.65mm | U13, U14 |
| 1 | FJ5461AH CC56-12SEKWA Shenzhen Zhihao Elec | CA56-12SEKWA | U16 |
| 1 | ET6226M UMW(Youtai Semiconductor Co., Ltd.) | SO-16_3.9x9.9mm_P1.27mm | U17 |
| 1 | TLV1117LV33DCYR Texas Instruments | SOT-223-3_TabPin2 | U20 |
| 1 | FT231XS-R FT231XS FTDI | SSOP-20_3.9x8.7mm_P0.635mm | U21 |
| 2 | USBLC6-2P6 TECH PUBLIC | SOT-666 | U25, U26 |
| 1 | PCA9536D NXP Semicon | SOIC-8_3.9x4.9mm_P1.27mm | U28 |
| 1 | LSM6DSOWTR LSM6DS3 STMicroelectronics | LGA-14_3x2.5mm_P0.5mm_LayoutBorder3x4y | U31 |
| 1 | LIS3MDLTR LIS3MDL STMicroelectronics | LGA-12_2x2mm_P0.5mm | U32 |
| 1 | ADS1115IDGSR ADS1115IDGS Texas Instruments | TSSOP-10_3x3mm_P0.5mm | U33 |
| 1 | AO3401A Q_PMOS_GSD UMW(Youtai Semiconductor Co., Ltd.) | SOT-23 | Q1 |
Show 89 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 5 | NX7002AK,215 Q_NMOS_GSD Nexperia | SOT-23 | Q2, Q3, Q4, Q5, Q10 |
| 2 | AO3401A BORN | SOT-23 | Q6, Q9 |
| 1 | AO3400A UMW(Youtai Semiconductor Co., Ltd.) | SOT-23 | Q7 |
| 1 | DMN10H220L-7 Si2328DS Diodes Incorporated | SOT-23-3 | Q8 |
| 2 | TXM16M0004322DBCDO00T 16MHz Yajingxin | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1, Y2 |
| 2 | SX3B14.7456F2010F30 14.7456MHz Shenzhen SCTF Elec | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y3, Y4 |
| 1 | HDMI-01 1747981-1 HCTL | TE_1747981-1 | J1 |
| 1 | M12A-08PFFR-SF7003 CAN Interface A | M12A-08PFFR | J2 |
| 1 | TYPEC-304J-BCP16 USB_C_Receptacle_USB2.0 XUNPU | USB_C_Receptacle_XKB_U262-16XN-4BVC11 | J3 |
| 5 | HC-2510-4A Conn_01x04 HCTL | Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | J4, J5, J6, J10, J12 |
| 1 | 902-131A1011D10100 USB HOSTING OUT Jing Extension of the Electronic Co. | USB_A_Female_UE27AC54100 | J7 |
| 1 | Conn_01x02 | PowerPole_PP45_1336G1_1x2_Horizontal | J8 |
| 1 | 744-81-03TW10 ESTOP PINREX | Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J9 |
| 2 | 744-81-03TW10 Conn_01x03 PINREX | Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J11, J21 |
| 1 | M12A-08PFFR-SF7003 CAN Interface B | M12A-08PFFR | J13 |
| 1 | 744-81-03TW10 Power Sw PINREX | Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J14 |
| 1 | 2.54-1*4P I2C OLED BOOMELE(Boom Precision Elec) | PinHeader_1x04_P2.54mm_Vertical | J15 |
| 2 | HC-2510-6A ~ HCTL | Ckmtw-W-2510S06P_1x06_P2.54mm_Vertical | J16, J17 |
| 1 | 2.54-2*5P Serial Rear BOOMELE(Boom Precision Elec) | PinSocket_2x05_P2.54mm_Vertical_SMD | J18 |
| 1 | SBUS | 610108249221 | J19 |
| 1 | DNP | PinHeader_1x04_P2.54mm_Vertical | J22 |
| 2 | DF40HC(3.0)-100DS-0.4V(51) Conn_01x01 HRS(Hirose) | DF40C-100DS-0.4V51 | J23, J24 |
| 1 | R-RJ45R08P-B000 RJ45 Ckmtw(Shenzhen Cankemeng) | RJ45_R-RJ45R08P-B000 | J25 |
| 1 | nSMD010 Polyfuse TECHFUSE | Fuse_1206_3216Metric | F1 |
| 1 | Polyfuse | Fuse_1206_3216Metric | F2 |
| 1 | TS-1101-C-W B3U-1000P XKB Connection | SW_TS_1101_C_W | SW1 |
| 4 | SS-12D10L5 SW_SPDT XKB Connection | CS12ANW03 | SW2, SW3, SW4, SW5 |
| 1 | DSHP02TSGET SW_DIP_x02 DongGuan KINGTEK Industrial Co.,LTD | SW_DIP_SPSTx02_Slide_KingTek_DSHP02TS_W7.62mm_P1.27mm | SW6 |
| 1 | DSHP04TSGET CONFIG_SW DongGuan KINGTEK Industrial Co.,LTD | SW_DIP_SPSTx04_Slide_KingTek_DSHP04TS_W7.62mm_P1.27mm | SW7 |
| 1 | TestPoint | TestPoint_Keystone_5019_Minature | TP1 |
| 2 | TestPoint | TestPoint_Loop_D2.60mm_Drill1.6mm_Beaded | TP2, TP3 |
| 1 | G2401CG Dongguan Mentech Optical & Magnetic | Transformer_Ethernet_YDS_30F-51NL_SO-24_7.1x15.1mm | TR1 |
| 3 | XL-2012UYC LED_YELLOW XINGLIGHT | LED_0805_2012Metric | D1, D17, D23 |
| 4 | NCD0805R1 LED_RED Foshan NationStar Optoelectronics | LED_0805_2012Metric | D2, D8, D28, D29 |
| 1 | SS510C D_Schottky Shandong Jingdao Microelectronics | D_SMC | D3 |
| 1 | XL-2012UGC LED_GREEN XINGLIGHT | LED_0805_2012Metric | D4 |
| 7 | WS2812B-B/T WS2812B Worldsemi | LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | D5, D6, D7, D18, D19, D20, D21 |
| 2 | SM712 CDSOT23-SM712 TECH PUBLIC | SOT-23-3 | D9, D10 |
| 1 | MBR0530 Jiangsu Changjing Electronics Technology Co., Ltd. | D_SOD-123 | D11 |
| 2 | KT-0805G LED_GREEN Hubei KENTO Elec | LED_0805_2012Metric | D12, D14 |
| 2 | ABS210 ABS2 Guangdong Hottech | Diode_Bridge_Diotec_ABS | D13, D22 |
| 1 | SMAJ60A FTR | D_SMA | D15 |
| 1 | M7 D MDD(Microdiode Semiconductor) | D_SMA | D16 |
| 1 | MMSZ5255B_R1_00001 28V / 500mW PANJIT International | D_SOD-123 | D24 |
| 1 | BZT52C15S 15V / 200mW Jiangsu Changjing Electronics Technology Co., Ltd. | D_SOD-323 | D25 |
| 1 | SMAJ51A TWGMC | D_SMA | D26 |
| 1 | 1N4148WS Jiangsu Changjing Electronics Technology Co., Ltd. | D_SOD-323 | D27 |
| 1 | 19-22/R6GHC-A32/2T LED_Dual_KKAA Everlight Elec | LED-ARRAY-SMD_4P-L1.9-W1.6-BL-CW | D30 |
| 1 | WS2812B Diode Dual Common Cathode 80v maximum reverse voltage | SOT-323_SC-70 | D31 |
| 1 | YPRH1508-101M 100uH YJYCOIN | L_15mmx15mm | L1 |
| 1 | NLCV32T-100K-PF 10uH TDK | L_1210_3225Metric | L2 |
| 3 | 4700630811R00 47uF 63V solid NJCON | CP_Radial_D8.0mm_P3.50mm | C1, C27, C28 |
| 4 | CL21A106KAYNNNE 10uF 25V Samsung Electro-Mechanics | C_0805_2012Metric | C2, C3, C17, C48 |
| 4 | CL10C180JB8NNNC 18pF 50V Samsung Electro-Mechanics | C_0603_1608Metric | C4, C7, C8, C10 |
| 1 | SPT1AM102F12OR 1000uF 10v solid Yunxing | CP_Radial_D8.0mm_P3.50mm | C5 |
| 20 | CC0603KRX7R9BB104 0.1uF 50V YAGEO | C_0603_1608Metric | C6, C9, C11, C12, C13, C14, C15, C16 +12 |
| 1 | CL10A475KA8NQNC 4.7uF 25V Samsung Electro-Mechanics | C_0603_1608Metric | C18 |
| 5 | CL10C220JB8NNNC 22pF 50V Samsung Electro-Mechanics | C_0603_1608Metric | C19, C21, C22, C23, C24 |
| 1 | 0603B105K250NT 1uF 25V FH (Guangdong Fenghua Advanced Tech) | C_0603_1608Metric | C20 |
| 1 | RVT1A471M0607 470uF 10V ROQANG | CP_Elec_6.3x7.7 | C29 |
| 3 | CL10A105KB8NNNC 1uF 50V Samsung Electro-Mechanics | C_0603_1608Metric | C32, C51, C52 |
| 2 | GRM32ER61C476KE15L 47uF 16V Murata Electronics | C_1210_3225Metric | C33, C38 |
| 1 | C3225X7S2A475KT000N 4.7uF 100V TDK | C_1210_3225Metric | C34 |
| 2 | CL21B104KCFNNNE 0.1uF 100V Samsung Electro-Mechanics | C_0805_2012Metric | C35, C39 |
| 1 | 0805B104K500NT 0.1uF 50V | C_0805_2012Metric | C40 |
| 4 | CC0603KRX7R0BB223 22nF 100v YAGEO | C_0603_1608Metric | C42, C44, C45, C46 |
| 1 | 1206B102K202NT 1nF 2kV FH (Guangdong Fenghua Advanced Tech) | C_1206_3216Metric | C43 |
| 2 | 0603WAF1001T5E 1k UNI-ROYAL(Uniroyal Elec) | R_0603_1608Metric | R1, R10 |
| 2 | 0603WAF4700T5E 470R UNI-ROYAL(Uniroyal Elec) | R_0603_1608Metric | R2, R3 |
| 6 | 0603WAF2201T5E 2.2k 1% UNI-ROYAL(Uniroyal Elec) | R_0603_1608Metric | R4, R9, R11, R32, R56, R57 |
| 17 | 0603WAF1002T5E 10K UNI-ROYAL(Uniroyal Elec) | R_0603_1608Metric | R5, R6, R12, R14, R23, R28, R29, R30 +9 |
| 4 | 0603WAF5101T5E 5.1k UNI-ROYAL(Uniroyal Elec) | R_0603_1608Metric | R7, R8, R51, R52 |
| 3 | 0603WAF270JT5E 27R UNI-ROYAL(Uniroyal Elec) | R_0603_1608Metric | R13, R38, R39 |
| 1 | 0603WAF560JT5E 56R UNI-ROYAL(Uniroyal Elec) | R_0603_1608Metric | R15 |
| 1 | FRC0603F2053TS 205k FOJAN | R_0603_1608Metric | R16 |
| 1 | 0603WAF1002T5E 1.8M UNI-ROYAL(Uniroyal Elec) | R_0603_1608Metric | R17 |
| 2 | C309610 10K | R_0603_1608Metric | R18, R20 |
| 2 | RC0603FR-071KL 1k YAGEO | R_0603_1608Metric | R19, R21 |
| 4 | RC0603FR-07100RL 100R YAGEO | R_0603_1608Metric | R22, R24, R25, R26 |
| 5 | 0603WAF1300T5E 130R UNI-ROYAL(Uniroyal Elec) | R_0603_1608Metric | R27, R45, R46, R59, R60 |
| 1 | ARG03FTC2000 200R Viking Tech | R_0603_1608Metric | R31 |
| 2 | 0603WAF1200T5E 120R UNI-ROYAL(Uniroyal Elec) | R_0603_1608Metric | R34, R35 |
| 1 | FRC0805J240TSD 24k FOJAN | R_0805_2012Metric | R36 |
| 1 | SCR0805F249K 249k VO | R_0805_2012Metric | R37 |
| 1 | 0805W8F5102T5E 51k UNI-ROYAL(Uniroyal Elec) | R_0805_2012Metric | R40 |
| 4 | PTFR0603B75R0N9 75R 100v RESI | R_0603_1608Metric | R41, R42, R43, R44 |
| 1 | RC0603FR-07100KL 100k YAGEO | R_0603_1608Metric | R50 |
| 2 | AR03BTC5002A 50k 0.1% Viking Tech | R_0603_1608Metric | R53, R54 |
| 1 | RT0603BRD075K1L 5.1k 0.1% YAGEO | R_0603_1608Metric | R55 |
Cm4 motherboard design files
The KiCad project lives in the Twisted-Fields/acorn-robot-electronics repository on GitHub; these links point at the commit this page was built from.
Cm4 motherboard: common questions
What microcontroller does the Cm4 motherboard use?
The Cm4 motherboard is built around the ET6226M, from the Raspberry Pi family.
How big is the Cm4 motherboard PCB?
The Cm4 motherboard measures 118 × 117 mm, has 4 copper layers and is 1.6062 mm thick.
How many components are on the Cm4 motherboard?
238 components, from 109 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 Cm4 motherboard design files?
From the Twisted-Fields/acorn-robot-electronics 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 Cm4 motherboard design in my own project?
The repository has no license, so all rights stay with Twisted-Fields. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Cm4 motherboard without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Raspberry Pi firmware against it before you order a PCB.
More boards in acorn-robot-electronics
RP2040/RP2350Supercap
109 × 155.5 mm184 parts4LNo license81
Raspberry PiAcorn motherboard
106 × 102.3 mm106 parts2LNo license81
RP2040/RP2350Acorn serial
78.7 × 69.4 mm96 parts2LNo license81
RP2040/RP2350Acorn odrive interface
138.5 × 68.2 mm73 parts2LNo license81
RP2040/RP2350Soft start
62 × 65.5 mm55 parts4LNo license81
Supercap simple
80 × 156 mm46 parts4LNo license81
Supercap1
209 × 100 mm46 parts2LNo license81
Supercap (copy)
210 × 60 mm46 parts2LNo license81
Mag sensor
36 × 22 mm5 parts2LNo license81
Gps adapter
106.5 × 43.5 mm5 parts2LNo license81
Similar boards
Raspberry PiOpen source rover
nasa-jpl
220 × 178 mm144 parts2LApache-2.09.7k
Raspberry PiSPIRIT
SPIRIT-org
82 × 155 mm130 parts6LCERN-OHL-S-2.01.3k
Raspberry PiCM5RevEng
schlae
55 × 40 mm417 parts10LNo license1.0k
Raspberry PiHaxo hw
cardonabits
102.4 × 211.3 mm38 parts2LCustom license672
Raspberry PiPowerBook
BlueSCSI
74.5 × 56.3 mm78 parts2LGPL-3.0449
Raspberry PiDesktop 50 Pin TopConn
89.2 × 82.6 mm103 parts2LGPL-3.0449