Lcbringup
About the Lcbringup PCB
Lcbringup is an open source STM32 PCB design by azonenberg, published on GitHub under the BSD-3-Clause license. It is a 4-layer board measuring 93 × 69 mm, with 198 components from 53 distinct parts.
Its main chip is the STM32H735-UFBGA176-25, from the STM32 family. Other key parts include the XC7A35T-2FGG484C, ECS-1612MV-250-CN, MUN12AD03-SE, AT24MAC402 and SIT9121AI-2BF-XXS156.250000G. By type, the board carries 100 capacitors, 45 resistors, 22 connectors, 11 ICs, 9 diodes and 5 test points.
From the project
Open hardware 48x 1000baseT + 2x 25G SFP28 Ethernet switch
This is a bringup test fixture for validating the line card (in conjunction with my kup-lulz XCKU5P FPGA board) and not intended to be part of the final LATENTED system.
Known errata: MDIO and MDC are on ball locations that are NC in the 7a35t FGG484 package. Reworked board connecting MDIO to the SPI pins on the adjacent bank and added external level shifters.
Main components on the Lcbringup
Lcbringup bill of materials (BOM)
198 components, 53 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | XC7A35T-2FGG484C | BGA_484_22x22_FULLARRAY_1MM | U1 |
| 1 | STM32H735-UFBGA176-25 | BGA_201_10x10_DEPOP_0.65MM_OSHPARK | U2 |
| 2 | ECS-1612MV-250-CN | OSCILLATOR_1.6x1.2 | U3, U4 |
| 5 | MUN12AD03-SE | MODULE_CYNTEC_MUN12AD03-SE | U5, U6, U9, U10, U11 |
| 1 | AT24MAC402 | DFN_8_0.5MM_2x3MM_TALL | U7 |
| 1 | SIT9121AI-2BF-XXS156.250000G | OSCILLATOR_LVDS_3.2x2.5 | U8 |
| 1 | XILINX_JTAG | XILINX_JTAG_PTH_MOLEX_0878311420 | J1 |
| 1 | CONN_01X10 | CONN_MOLEX_PICOBLADE_10POS_0532611071 | J2 |
| 1 | CONN_SFP_HOST | CONN_SFP+_AMPHENOL_UE76_A10_2000T | J3 |
| 1 | CORTEX_DEBUG_ETM | CONN_HEADER_1.27MM_2x10_SMT_SAMTEC_FTSH-110-01-L-DV-K | J4 |
| 1 | CONN_01X03 | CONN_HEADER_2.54MM_1x3_REFLOW | J5 |
| 1 | SFP_CAGE | CONN_SFP_CAGE_TE_2007194-1 | J7 |
| 1 | CONN_IBC_MGMT | CONN_MOLEX_PICOBLADE_5POS_0532610571 | J8 |
| 1 | CONN_ATX12V | CONN_MOLEX_MINIFITJR_4POS_0039291048 | J9 |
| 12 | SMPM | CONN_SMPM_AMPHENOL_C925-197J-51PT | J10, J12, J13, J14, J15, J16, J17, J18 +4 |
| 1 | ARF6-08-S-D-A-K-TR | CONN_SAMTEC_ARF6-08-S-D-A-K-TR | J11 |
| 1 | CONN_IBC_MGMT_HOST | CONN_MOLEX_PICOBLADE_5POS_0532610571 | J23 |
| 1 | 1A | EIA_0402_RES_NOSILK | F1 |
| 1 | CONN_01X03 | CONN_HEADER_2.54MM_1x3_REFLOW | TP1 |
| 3 | U.FL | CONN_U.FL_TE_1909763-1 | TP2, TP3, TP4 |
Show 33 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | GROUNDCLIP | TESTPOINT_SMT_KEYSTONE_5016 | TP5 |
| 9 | GREEN | EIA_0402_LED | D1, D2, D3, D4, D5, D10, D11, D12 +1 |
| 1 | MI0603J601R-10 | EIA_0603_INDUCTOR_NOSILK | FB1 |
| 1 | BLM31KN271SN1L | EIA_1206_CAP_NOSILK | FB2 |
| 1 | 2.2 uH | EIA_1210_CAP_NOSILK | L1 |
| 2 | 4.7 uH | EIA_0805_INDUCTOR_NOSILK | L2, L3 |
| 3 | 100 uF | EIA_1210_CAP_NOSILK | C1, C3, C4 |
| 46 | 0.47 uF | EIA_0402_CAP_NOSILK | C2, C7, C8, C13, C14, C17, C18, C19 +38 |
| 21 | 4.7 uF | EIA_0603_CAP_NOSILK | C5, C6, C9, C10, C11, C15, C16, C20 +13 |
| 1 | 47 uF | EIA_1210_CAP_NOSILK | C12 |
| 3 | 10 uF | EIA_0805_CAP_NOSILK | C39, C64, C66 |
| 3 | 22 uF | EIA_0805_CAP_NOSILK | C50, C74, C75 |
| 1 | 220 pF | EIA_0402_CAP_NOSILK | C65 |
| 7 | 0.1 uF | EIA_0402_CAP_NOSILK | C70, C71, C72, C73, C76, C77, C78 |
| 5 | 22 uF | EIA_1812_CAP_NOSILK | C79, C80, C81, C89, C93 |
| 10 | 22 uF | EIA_1210_CAP_NOSILK | C82, C83, C84, C85, C86, C87, C90, C91 +2 |
| 9 | 33K | EIA_0402_RES_NOSILK | R1, R7, R8, R9, R10, R16, R17, R18 +1 |
| 4 | 33 | EIA_0402_RES_NOSILK | R2, R6, R20, R21 |
| 6 | 4.7K | EIA_0402_RES_NOSILK | R3, R4, R26, R27, R32, R33 |
| 1 | 0 | EIA_0402_RES_NOSILK | R5 |
| 7 | 10K | EIA_0402_RES_NOSILK | R11, R12, R24, R35, R36, R37, R45 |
| 1 | 294K | EIA_0402_RES_NOSILK | R13 |
| 1 | 93.1K | EIA_0402_RES_NOSILK | R14 |
| 1 | 100 | EIA_0402_RES_NOSILK | R22 |
| 3 | 1K | EIA_0402_RES_NOSILK | R23, R28, R44 |
| 1 | 0.1 | EIA_0402_RES_NOSILK | R29 |
| 2 | 0.5 | EIA_0402_RES_NOSILK | R30, R31 |
| 1 | DNP | EIA_0402_RES_NOSILK | R34 |
| 1 | 200K | EIA_0402_RES_NOSILK | R38 |
| 4 | 100K | EIA_0402_RES_NOSILK | R39, R40, R41, R46 |
| 1 | 187K | EIA_0402_RES_NOSILK | R42 |
| 1 | 280K | EIA_0402_RES_NOSILK | R43 |
| 1 | 22.1K | EIA_0402_RES_NOSILK | R47 |
Lcbringup design files
The KiCad project lives in the azonenberg/latentred repository on GitHub; these links point at the commit this page was built from.
Lcbringup: common questions
What microcontroller does the Lcbringup use?
The Lcbringup is built around the STM32H735-UFBGA176-25, from the STM32 family.
How big is the Lcbringup PCB?
The Lcbringup measures 93 × 69 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Lcbringup?
198 components, from 53 distinct parts. The full bill of materials is listed on this page.
Where can I download the Lcbringup design files?
From the azonenberg/latentred repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Lcbringup 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 Lcbringup 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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