Main
About the Main PCB
Main is an open source STM32 PCB design by azonenberg, published on GitHub under the BSD-3-Clause license. It is a 10-layer board measuring 130 × 90 mm, with 435 components from 69 distinct parts.
Its main chip is the STM32L431-QFN48, from the STM32 family. Other key parts include the XC7S100-1FGGA484C, INA230, NCP45525IMNTWG-H, LTC3374-QFN and AT24MAC402. By type, the board carries 219 capacitors, 110 resistors, 39 ICs, 20 test points, 14 connectors and 14 inductors.
From the project
FPGA based dumper for flashes and more
1.0V shunt resistor is missing a zone fill. Will monitor droop under load and see if we need to add top layer power path. U33 is way too close to J10. Seems to have fit OK, not touching for now, but tough to assemble. INITB and PROGB on FPGA are 1.8V signals but we try to drive with 3.3 from supervisor! Rework: add pull to 1.8V on board, open drain in super firmware JTAG connector VCC is connected to 3.3V. We need to supply 1.8 here. Temporary workaround: six pin extension cable, pass through JTAG + GND and supply 1.8V to dongle externally. Long term fix: interposer board * DONE on FPGA is…
Main components on the Main
Main bill of materials (BOM)
435 components, 69 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | XC7S100-1FGGA484C | BGA_484_22x22_FULLARRAY_1MM | U1 |
| 1 | STM32L431-QFN48 | QFN_48_0.5MM_7x7MM | U2 |
| 12 | INA230 | QFN_16_0.5MM_3x3MM | U3, U4, U5, U6, U7, U8, U9, U19 +4 |
| 6 | NCP45525IMNTWG-H | DFN_8_0.5MM_2x2MM | U10, U23, U27, U29, U31, U39 |
| 1 | LTC3374-QFN | QFN_38_0.5MM_5x7MM | U11 |
| 1 | AT24MAC402 | DFN_8_0.5MM_2x3MM_TALL | U12 |
| 3 | ECS-1612MV-250-CN | OSCILLATOR_1.6x1.2 | U13, U16, U18 |
| 1 | STM32H735-UFBGA176-25 | BGA_201_10x10_DEPOP_0.65MM_OSHPARK | U14 |
| 1 | S27KL0642GABHB020 | BGA_24_6x8_DEPOP1_1MM | U15 |
| 1 | S27KS0642GABHI030 | BGA_24_6x8_DEPOP1_1MM | U17 |
| 1 | KSZ9031RN | QFN_48_0.5MM_7x7MM | U20 |
| 2 | RCLAMP0514M | SOP_10_0.5MM_3MM | U21, U22 |
| 1 | IS25WP256D-JLLE | DFN_8_1.27MM_8x6MM | U24 |
| 1 | 74LVC1T45 | DFN_6_0.5MM_1.6x1.6MM_TI_DPK | U26 |
| 6 | 19-C47/RSGHBHC-5V01/2T | LED_EVERLIGHT_19-C47_RSGHBHC-5V01_2T | U33, U34, U35, U36, U37, U38 |
| 1 | SSM6N58NU | DFN_6_0.65MM_2x2MM_GDS | Q1 |
| 3 | CONN_01X03 | CONN_HEADER_2.54MM_1x3 | J1, J5, J11 |
| 2 | CORTEX_DEBUG_ETM | CONN_HEADER_1.27MM_2x10_SMT_SAMTEC_FTSH-110-01-L-DV-K | J2, J4 |
| 1 | XILINX_JTAG | XILINX_JTAG_PTH_MOLEX_0878311420 | J3 |
| 1 | 0826-1G1T-23-F | CONN_BELFUSE_0826_1G1T_23_F | J6 |
Show 49 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | CONN_DUMPTRUCK_HOST | CONN_SAMTEC_BTE-040-01-F-D-A-K | J7, J8, J9, J10 |
| 2 | PMOD_HOST | CONN_HEADER_2.54MM_2x6_RA_PMOD_HOST | J12, J13 |
| 1 | USB_C_Receptacle_USB2.0 | GCT_USB4500-03-0-A | J14 |
| 1 | 1A | EIA_0402_RES_NOSILK | F1 |
| 4 | Jumper | CONN_HEADER_2.54MM_1x2 | JP1, JP2, JP3, JP4 |
| 2 | SWITCH | SWITCH_RAFI_MICON_5 | SW1, SW2 |
| 15 | U.FL | CONN_U.FL_TE_1909763-1 | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +7 |
| 1 | CONN_01X08 | CONN_HEADER_2.54MM_1x8 | TP15 |
| 1 | CONN_01X03 | CONN_HEADER_2.54MM_1x3 | TP17 |
| 3 | GROUND | TESTPOINT_SMT_KEYSTONE_5016 | TP18, TP19, TP20 |
| 10 | GREEN | EIA_0402_LED | D1, D2, D4, D5, D6, D7, D8, D9 +2 |
| 1 | RED | EIA_0402_LED | D3 |
| 6 | MI0603J601R-10 | EIA_0603_INDUCTOR_NOSILK | FB1, FB2, FB3, FB4, FB5, FB6 |
| 7 | 2.2 uH | EIA_1210_CAP_NOSILK | L1, L2, L3, L4, L5, L6, L7 |
| 1 | BLM31KN271SN1L | EIA_1206_CAP_NOSILK | L8 |
| 127 | 0.47 uF | EIA_0402_CAP_NOSILK | C1, C4, C5, C6, C7, C8, C9, C10 +119 |
| 43 | 4.7 uF | EIA_0603_CAP_NOSILK | C2, C20, C21, C22, C23, C24, C25, C36 +35 |
| 5 | 0.1 uF | EIA_0402_CAP_NOSILK | C3, C141, C142, C143, C144 |
| 5 | 22 uF | EIA_1210_CAP_NOSILK | C16, C93, C99, C171, C182 |
| 3 | 100 uF | EIA_1206_CAP_NOSILK | C17, C18, C46 |
| 6 | 47 uF | EIA_1210_CAP_NOSILK | C19, C35, C71, C92, C174, C209 |
| 1 | 100 uF | EIA_1210_CAP_NOSILK | C78 |
| 2 | 10 uF | EIA_1210_CAP_NOSILK | C91, C96 |
| 7 | 22 uF | EIA_1206_CAP_NOSILK | C95, C135, C178, C185, C187, C192, C197 |
| 3 | 10 uF | EIA_1206_CAP_NOSILK | C100, C166, C169 |
| 3 | 10 uF | EIA_0805_CAP_NOSILK | C106, C125, C127 |
| 2 | 2.2 uF | EIA_0805_CAP_NOSILK | C107, C111 |
| 4 | 22 uF | EIA_0805_CAP_NOSILK | C116, C168, C190, C195 |
| 1 | 220 pF | EIA_0402_CAP_NOSILK | C126 |
| 7 | DNP | EIA_0402_CAP_NOSILK | C177, C181, C184, C189, C194, C201, C207 |
| 4 | DNP | EIA_0402_RES_NOSILK | R1, R96, R98, R100 |
| 10 | 33K | EIA_0402_RES_NOSILK | R2, R3, R29, R30, R31, R33, R34, R37 +2 |
| 6 | 4.7K | EIA_0402_RES_NOSILK | R4, R26, R27, R36, R40, R57 |
| 32 | 10K | EIA_0402_RES_NOSILK | R5, R13, R14, R15, R18, R19, R20, R32 +24 |
| 5 | 1K | EIA_0402_RES_NOSILK | R6, R47, R55, R58, R65 |
| 22 | 33 | EIA_0402_RES_NOSILK | R7, R8, R28, R35, R42, R45, R48, R49 +14 |
| 12 | 25 mR | EIA_0402_RES_NOSILK | R9, R21, R22, R23, R76, R80, R91, R93 +4 |
| 2 | 0 | EIA_0402_RES_NOSILK | R10, R108 |
| 3 | 280K | EIA_0402_RES_NOSILK | R11, R16, R24 |
| 2 | 88.7K | EIA_0402_RES_NOSILK | R12, R25 |
| 1 | 130K | EIA_0402_RES_NOSILK | R17 |
| 2 | 470 | EIA_0402_RES_NOSILK | R43, R44 |
| 2 | 232K | EIA_0402_RES_NOSILK | R46, R81 |
| 1 | 12.1K 1% | EIA_0402_RES_NOSILK | R54 |
| 1 | 187K | EIA_0402_RES_NOSILK | R75 |
| 1 | 464K | EIA_0402_RES_NOSILK | R82 |
| 1 | 255K | EIA_0402_RES_NOSILK | R86 |
| 1 | 1.02M | EIA_0402_RES_NOSILK | R87 |
| 2 | 5.1k | EIA_0402_RES_NOSILK | R103, R104 |
Main design files
The KiCad project lives in the azonenberg/dumptruck repository on GitHub; these links point at the commit this page was built from.
- Layoutmain-pcb/main-pcb.kicad_pcb
- Schematicmain-pcb/main-pcb.kicad_sch
Main: common questions
What microcontroller does the Main use?
The Main is built around the STM32L431-QFN48, from the STM32 family.
How big is the Main PCB?
The Main measures 130 × 90 mm, has 10 copper layers and is 1.599994 mm thick.
How many components are on the Main?
435 components, from 69 distinct parts. The full bill of materials is listed on this page.
Where can I download the Main design files?
From the azonenberg/dumptruck repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Main design in my own project?
Yes, under the terms of its BSD-3-Clause license, which azonenberg chose for the repository.
Can I test firmware for the Main 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.
More boards in dumptruck
Ram expansion
40.3 × 21.8 mm24 parts4LBSD-3-Clause17
Qspi mitm
41 × 20.5 mm12 parts4LBSD-3-Clause17
Pin header
55.5 × 26.5 mm12 parts4LBSD-3-Clause17
Qspi interposer
58.5 × 20.5 mm10 parts4LBSD-3-Clause17
Dfn8-small qspi
52.5 × 20.5 mm10 parts4LBSD-3-Clause17
Parallel nor csp56
57 × 31 mm10 parts4LBSD-3-Clause17
Soic8-wide
52.5 × 20.5 mm10 parts4LBSD-3-Clause17
Jtag interposer
20 × 31 mm5 parts4LBSD-3-Clause17
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