EFM
About the EFM PCB
EFM is an open source AVR/Arduino PCB design by pbbp0904, published on GitHub under the MIT license. It is a 2-layer board measuring 49.2 × 57 mm, with 29 components from 22 distinct parts.
Its main chip is the ATxmega32A4U-AU, from the AVR/Arduino family. Other key parts include the TPS60400DBVR, LM741 and XCL206B. By type, the board carries 10 capacitors, 6 resistors, 5 ICs, 4 connectors, 2 inductors and 1 module.
From the project
The rendering above is a rough idea of what this payload will look like with some of its components installed.
Main components on the EFM
EFM bill of materials (BOM)
29 components, 22 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TPS60400DBVR | TPS60400DBVR | U1 |
| 2 | LM741 | SOIC-8_3.9x4.9mm_P1.27mm | U2, U3 |
| 1 | XCL206B | 6-TDFN | U4 |
| 1 | ATxmega32A4U-AU | TQFP-44_10x10mm_P0.8mm | U5 |
| 1 | SHC_123_BATTERY_HOLDERCR-123-A | SHC_CR-123-A_HOLDER | M1 |
| 1 | Openlog | Molex_KK-254_AE-6410-06A_1x06_P2.54mm_Vertical | J1 |
| 1 | IMU | Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | J2 |
| 1 | Spheres | Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J3 |
| 1 | AVR-PDI-6 | PinHeader_2x03_P2.54mm_Vertical | J4 |
| 1 | LED | LED_0805_2012Metric | D1 |
| 1 | FB | L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | FB1 |
| 1 | L_Small | L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | L1 |
| 4 | 1u | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1, C2, C3, C6 |
| 1 | 4.7u | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C4 |
| 3 | 10u | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C5, C7, C9 |
| 2 | 0.1u | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C8, C10 |
| 1 | 220 | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1 |
| 1 | 1M | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R2 |
| 1 | 1k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R3 |
| 1 | 28k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R4 |
Show 2 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 6k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R5 |
| 1 | 10k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R6 |
EFM design files
The KiCad project lives in the pbbp0904/HELEN repository on GitHub; these links point at the commit this page was built from.
EFM: common questions
What microcontroller does the EFM use?
The EFM is built around the ATxmega32A4U-AU, from the AVR/Arduino family.
How big is the EFM PCB?
The EFM measures 49.2 × 57 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the EFM?
29 components, from 22 distinct parts. The full bill of materials is listed on this page.
Where can I download the EFM design files?
From the pbbp0904/HELEN repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the EFM design in my own project?
Yes, under the terms of its MIT license, which pbbp0904 chose for the repository.
Can I test firmware for the EFM without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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