Chassis
About the Chassis PCB
Chassis is an open source Silicon Labs PCB design by crawford, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 60.3 × 52.7 mm, with 86 components from 53 distinct parts.
Its main chip is the EFM32GG11B8xx, from the Silicon Labs family. Other key parts include the TPS23754PWPR, TCMT1107, KSZ8081RND and L78L33_SO8. By type, the board carries 35 capacitors, 25 resistors, 6 ICs, 6 diodes, 5 inductors and 3 transistors.
From the project
A base platform for PoE peripherals
This project makes use of git commit hooks. Configure git to use them by running the following from the root of the repository:
git config --local core.hooksPath .githooks/
Main components on the Chassis
Chassis bill of materials (BOM)
86 components, 53 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TPS23754PWPR | TSSOP-20 | U1 |
| 2 | TCMT1107 | SOP-4_4.4x2.6mm_P1.27mm | U2, U3 |
| 1 | KSZ8081RND | QFN-24 | U4 |
| 1 | L78L33_SO8 | SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | EFM32GG11B8xx | QFP-64 | U6 |
| 1 | SiR422DP | PowerPAK_SO-8_Single | Q1 |
| 1 | Si7898DP | PowerPAK_SO-8_Single | Q2 |
| 1 | MMDT3906 | SOT-363_SC-70-6 | Q3 |
| 1 | RJ45_LED_Shielded | RJHSE-538X | J1 |
| 2 | TestPoint | TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | 12V1, GND1 |
| 1 | PoE_Transformer | POE_EP13 | T1 |
| 1 | Pulse_Transformer | GDTI_EP7 | T2 |
| 1 | PT61017PEL | Transformer_Ethernet_Bourns_PT61017PEL | TR1 |
| 2 | D | D_0402_1005Metric | D1, D2 |
| 1 | D_Zener | D_0402_1005Metric | D3 |
| 2 | D_Bridge_+-AA | Diode_Bridge_Diotec_ABS | D4, D5 |
| 1 | TL431DBZ | SOT-23 | D6 |
| 2 | Ferrite_Bead_Small | R_1206_3216Metric | FB1, FB2 |
| 1 | 3u3 | L_0402_1005Metric | L1 |
| 1 | 0u33 | L_0402_1005Metric | L2 |
Show 33 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Ferrite_Bead | L_0402_1005Metric | L3 |
| 9 | 0u1 | C_0402_1005Metric | C1, C5, C14, C27, C29, C31, C32, C33 +1 |
| 1 | 47u | C_0402_1005Metric | C2 |
| 5 | 1u | C_0402_1005Metric | C3, C4, C9, C11, C16 |
| 1 | 141u | C_0402_1005Metric | C6 |
| 2 | 330u | C_0402_1005Metric | C7, C8 |
| 1 | 1n2 | C_0402_1005Metric | C10 |
| 1 | 22u | C_0402_1005Metric | C12 |
| 2 | 1n | C_0402_1005Metric | C13, C25 |
| 2 | 2u2 | C_0402_1005Metric | C15, C26 |
| 2 | 0u47 | C_0402_1005Metric | C17, C22 |
| 4 | 0u01 | C_0402_1005Metric | C18, C19, C20, C21 |
| 1 | 330p | C_0402_1005Metric | C23 |
| 1 | 3n3 | C_0402_1005Metric | C24 |
| 2 | 22 | C_0402_1005Metric | C28, C30 |
| 1 | 0u33 | C_0402_1005Metric | C34 |
| 2 | 1k2 | R_0402_1005Metric | R1, R4 |
| 1 | 39K | R_0402_1005Metric | R2 |
| 3 | 10 | R_0402_1005Metric | R3, R6, R10 |
| 1 | 24k9 | R_0402_1005Metric | R5 |
| 1 | 22k1 | R_0402_1005Metric | R7 |
| 2 | 69k8 | R_0402_1005Metric | R8, R9 |
| 1 | 63R4 | R_0402_1005Metric | R11 |
| 1 | 0R18 | R_0402_1005Metric | R12 |
| 1 | 2k | R_0402_1005Metric | R13 |
| 1 | 10k | R_0402_1005Metric | R14 |
| 4 | 75 | R_0402_1005Metric | R15, R16, R17, R18 |
| 2 | 1k | R_0402_1005Metric | R19, R23 |
| 1 | 115k | R_0402_1005Metric | R20 |
| 1 | 13k3 | R_0402_1005Metric | R21 |
| 1 | 100 | R_0402_1005Metric | R22 |
| 1 | 6k49 | R_0402_1005Metric | R24 |
| 1 | 49R9 | R_0402_1005Metric | R25 |
Chassis design files
The KiCad project lives in the crawford/PoE repository on GitHub; these links point at the commit this page was built from.
Chassis: common questions
What microcontroller does the Chassis use?
The Chassis is built around the EFM32GG11B8xx, from the Silicon Labs family.
How big is the Chassis PCB?
The Chassis measures 60.3 × 52.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Chassis?
86 components, from 53 distinct parts. The full bill of materials is listed on this page.
Where can I download the Chassis design files?
From the crawford/PoE repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Chassis design in my own project?
Yes, under the terms of its GPL-3.0 license, which crawford chose for the repository.
Can I test firmware for the Chassis without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Silicon Labs firmware against it before you order a PCB.
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