LAM-4I4O-REVC
About the LAM-4I4O-REVC PCB
LAM-4I4O-REVC is an open source RISC-V PCB design by b4ck5p4c3, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 65 × 80 mm, with 52 components from 22 distinct parts.
Its main chip is the CH32V003AxMx, from the RISC-V family. Other key parts include the SN75176BDR, LT1117-5.0 and ULN2003. By type, the board carries 16 diodes, 12 connectors, 9 resistors, 6 capacitors, 5 fuses and 4 ICs.
From the project
🏭 Series of weird space automation devices
Endpoint-style device with four inputs and four outputs.
- Inputs: Four non-isolated discrete inputs (0 to 12V). - Outputs: Four non-isolated outputs (12V, 1A max). - Power: 7-12V DC input. Logic is fused at 0.75A, IO is not fused. - Connectivity: Single 8P8C connector for Modbus RTU over RS-485.
- Address: individual for each device, set in firmware. - Port configuration: 115200, 8N1
Main components on the LAM-4I4O-REVC
LAM-4I4O-REVC bill of materials (BOM)
52 components, 22 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CH32V003AxMx | SOP-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | SN75176BDR | SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | LT1117-5.0 | SOT-223-3_TabPin2 | U3 |
| 1 | ULN2003 | SOIC-16_3.9x9.9mm_P1.27mm | U4 |
| 3 | MC1,5 2G-3.81 | PhoenixContact_MCV_1,5_2-G-3.81_1x02_P3.81mm_Vertical | J1, J2, J3 |
| 1 | PLS | PinHeader_1x03_P2.54mm_Vertical | J4 |
| 8 | MC 1,5/2G-3,81 | PhoenixContact_MC_1,5_2-G-3.81_1x02_P3.81mm_Horizontal | J5, J6, J7, J8, J9, J10, J11, J12 |
| 1 | MF-SM075-2 | FUSE-SMD_L7.4-W5.4 | F1 |
| 4 | MF-NSMF050-2 | Fuse_1206_3216Metric | F2, F3, F4, F5 |
| 1 | PESD15VS2UT,215 PESD15VL2BT | SOT-23 | D1 |
| 1 | SS14 | D_SMA | D2 |
| 1 | PESD12VS1UB | D_SOD-523 | D3 |
| 3 | LED | LED_1206_3216Metric_ReverseMount_Hole1.8x2.4mm | D4, D5, D6 |
| 4 | BZV55C5V1 | D_MiniMELF | D7, D8, D9, D10 |
| 4 | LL4448 | D_MiniMELF | D11, D12, D13, D14 |
| 2 | PESD15VS2UT,215 PESD12VS2UT | SOT-23 | D15, D16 |
| 3 | 0.1uF / 16V | C_0805_2012Metric | C1, C2, C3 |
| 2 | 10uF / 16V | C_0805_2012Metric | C4, C5 |
| 1 | 470uF / 25V | CP_Elec_6.3x5.9 | C6 |
| 2 | 10R | R_0805_2012Metric | R1, R2 |
Show 2 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 200R | R_0805_2012Metric | R3, R4, R5 |
| 4 | 1K | R_0805_2012Metric | R6, R7, R8, R9 |
LAM-4I4O-REVC design files
The KiCad project lives in the b4ck5p4c3/lambium repository on GitHub; these links point at the commit this page was built from.
LAM-4I4O-REVC: common questions
What microcontroller does the LAM-4I4O-REVC use?
The LAM-4I4O-REVC is built around the CH32V003AxMx, from the RISC-V family.
How big is the LAM-4I4O-REVC PCB?
The LAM-4I4O-REVC measures 65 × 80 mm, has 2 copper layers and is 1.58 mm thick.
How many components are on the LAM-4I4O-REVC?
52 components, from 22 distinct parts. The full bill of materials is listed on this page.
Where can I download the LAM-4I4O-REVC design files?
From the b4ck5p4c3/lambium repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the LAM-4I4O-REVC design in my own project?
Yes, under the terms of its CERN-OHL-S-2.0 license, which b4ck5p4c3 chose for the repository.
Can I test firmware for the LAM-4I4O-REVC without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RISC-V firmware against it before you order a PCB.
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