CM4IOv5
About the CM4IOv5 PCB
CM4IOv5 is an open source STM32 PCB design by DevCyclonekitten, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 160 × 90 mm, with 137 components from 73 distinct parts.
Its main chip is the STM32G431KBU3, from the STM32 family. Other key parts include the TMC2209-LA, AMS1117-3.3, TPD4EUSB30, 74LVC1G07SE-7 and USB2514B-I/M2. By type, the board carries 59 capacitors, 31 resistors, 20 connectors, 16 ICs, 4 diodes and 2 crystals.
From the project
A repository about the development of modifying a bambu labs a1 printer to run on klipper
Site viewable at: https://devcyclonekitten.github.io/Bambu-A1-Klipper/
Uhh this hasn't been updated, but so far I did get the printer working, then killed mainboard I have all components working, except screen and eddy current sensor, am just finalizing pcb's then trying to rebuild.
Main components on the CM4IOv5
CM4IOv5 bill of materials (BOM)
137 components, 73 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TMC2209-LA TPD4EUSB30 | USON-10_2.5x1.0mm_P0.5mm | U1 |
| 1 | STM32G431KBU3 TPD4EUSB30 | USON-10_2.5x1.0mm_P0.5mm | U2 |
| 1 | AMS1117-3.3 MagJack-A70-112-331N126 | TRJG0926HENL | U3 |
| 1 | TPD4EUSB30 | USON-10_2.5x1.0mm_P0.5mm | U4 |
| 3 | 74LVC1G07SE-7 | SOT-353_SC-70-5 | U5, U9, U14 |
| 1 | USB2514B-I/M2 | QFN-36-1EP_6x6mm_P0.5mm_EP3.7x3.7mm | U6 |
| 1 | AP22653W6 | SOT-23-6 | U7 |
| 1 | PCF85063AT/AAZ | SOIC-8_3.9x4.9mm_P1.27mm | U8 |
| 1 | EMC2301-1-ACZL-TR | MSOP-8_3x3mm_P0.65mm | U11 |
| 1 | RT9742SNGV | SOT-23 | U12 |
| 1 | FSUSB42MUX | MSOP-10_3x3mm_P0.5mm | U13 |
| 2 | AP64501SP-13 | SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.95x4.9mm_Mask2.71x3.4mm_ThermalVias | U15, U16 |
| 1 | RT9742GGJ5 | SOT-23-5 | U18 |
| 1 | DMP3013SFV-7 | Diodes_PowerDI3333-8 | Q1 |
| 1 | CRYSTAL_GND24 24MHz | Crystal_SMD_HC49-SD | Y1 |
| 1 | X32K768S301 | Crystal_SMD_3215-2Pin_3.2x1.5mm | Y2 |
| 2 | Conn_01x03 | PinHeader_1x03_P2.54mm_Vertical | J1, J3 |
| 1 | Conn_02x07_Odd_Even | PinHeader_2x07_P2.54mm_Vertical | J2 |
| 4 | Conn_01x22_Female | Hirose_FH12-22S-0.5SH_1x22-1MP_P0.50mm_Horizontal | J4, J5, J15, J16 |
| 1 | THD-02-R | PinHeader_2x02_P2.54mm_Vertical | J6 |
Show 53 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Micro_SD_Card_Det | SDCARD_MOLEX_503398-1892 | J7 |
| 1 | THD-20-R | PinHeader_2x20_P2.54mm_Vertical | J8 |
| 1 | ADXL345 THD-02-R | PinHeader_2x02_P2.54mm_Vertical | J9 |
| 2 | 690-019-298-412 | EDAC 690-019-298-412 | J10, J22 |
| 1 | USB_OTG | USB_Micro-B_EDAC_UCON00686 | J11 |
| 1 | 10018783-11200TLF | PCIex1-36 | J12 |
| 1 | 690-008-221-904 | MOLEX_USB_67298-4090 | J13 |
| 1 | CONN_01X08_PIN Conn_02x05_Odd_Even | PinHeader_2x05_P2.54mm_Vertical | J14 |
| 1 | Molex 470531000 | FanPinHeader_1x04_P2.54mm_Vertical | J17 |
| 1 | Barrel_Jack | BarrelJack_Horizontal | J19 |
| 1 | AMP171826-4 | TE_171826-4 | J20 |
| 1 | Battery_Cell | BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | ComputeModule4 | Raspberry-Pi-4-Compute-Module | Module1 |
| 1 | DSK26 LED Red | LED_0603_1608Metric | D1 |
| 1 | LED Green | LED_0603_1608Metric | D2 |
| 1 | BAV99 BAT54C-7-F | SOT-23 | D3 |
| 1 | DSK26 MMBZ5242BLT3G | D_SOT-23_ANK | D4 |
| 2 | SRN6045TA-3R3Y | L_Bourns_SRN6045TA | L3, L5 |
| 5 | 100NF 100n | C_0402_1005Metric | C1, C3, C4, C13, C22 |
| 1 | C2749 10u | C_0805_2012Metric | C2 |
| 1 | 100NF 10u | C_0805_2012Metric | C5 |
| 1 | 22NF 10u | C_0805_2012Metric | C6 |
| 3 | 4.7UF 100n | C_0402_1005Metric | C7, C11, C12 |
| 1 | 100NF 27pF | C_0402_1005Metric | C8 |
| 1 | 27pF | C_0402_1005Metric | C9 |
| 9 | 10u | C_0805_2012Metric | C10, C30, C31, C32, C33, C47, C49, C51 +1 |
| 2 | 10UF 100n | C_0402_1005Metric | C14, C15 |
| 1 | 100NF 100uF | CP_EIA-7343-31_Kemet-D | C16 |
| 3 | 1UF 10u | C_0805_2012Metric | C17, C20, C21 |
| 1 | 10UF 100uF | CP_EIA-7343-31_Kemet-D | C18 |
| 1 | 10UF 10u | C_0805_2012Metric | C19 |
| 2 | 30PF 100n | C_0402_1005Metric | C23, C24 |
| 13 | 10u 35v | C_0805_2012Metric | C25, C26, C27, C28, C34, C35, C37, C38 +5 |
| 6 | 100n | C_0402_1005Metric | C29, C40, C46, C57, C58, C62 |
| 1 | 100n 100v | C_0402_1005Metric | C36 |
| 1 | 100uF | CP_EIA-7343-31_Kemet-D | C45 |
| 4 | nf | C_0402_1005Metric | C59, C61, C63, C65 |
| 2 | 1.2nF | C_0402_1005Metric | C60, C64 |
| 1 | 1KO 1k | R_0402_1005Metric | R1 |
| 2 | 470R | R_0402_1005Metric | R2, R3 |
| 1 | nf | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R4 |
| 1 | 0R | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R5 |
| 5 | 2.2K 1% | R_0402_1005Metric | R6, R7, R8, R11, R28 |
| 1 | 100MO 10R | R_0402_1005Metric | R9 |
| 1 | 1k | R_0402_1005Metric | R10 |
| 5 | 36K 1% | R_0402_1005Metric | R12, R13, R14, R16, R21 |
| 5 | 12K 1% | R_0402_1005Metric | R15, R23, R26, R27, R29 |
| 2 | nf | R_0402_1005Metric | R17, R18 |
| 2 | 510K 1% | R_0402_1005Metric | R19, R20 |
| 1 | 10R | R_0402_1005Metric | R22 |
| 1 | 47K 1% | R_0402_1005Metric | R24 |
| 1 | 20K 1% | R_0402_1005Metric | R25 |
| 2 | 15K 1% | R_0402_1005Metric | R30, R36 |
CM4IOv5 design files
The KiCad project lives in the DevCyclonekitten/Bambu-A1-Klipper repository on GitHub; these links point at the commit this page was built from.
CM4IOv5: common questions
What microcontroller does the CM4IOv5 use?
The CM4IOv5 is built around the STM32G431KBU3, from the STM32 family.
How big is the CM4IOv5 PCB?
The CM4IOv5 measures 160 × 90 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the CM4IOv5?
137 components, from 73 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 CM4IOv5 design files?
From the DevCyclonekitten/Bambu-A1-Klipper 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 CM4IOv5 design in my own project?
Yes, under the terms of its GPL-3.0 license, which DevCyclonekitten chose for the repository.
Can I test firmware for the CM4IOv5 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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