Sammy
About the Sammy PCB
Sammy is an open source Microchip SAM PCB design by openinput-fw, published on GitHub under the CERN-OHL-P-2.0 license. It is a 4-layer board measuring 25 × 45 mm, with 60 components from 31 distinct parts.
Its main chip is the ATSAM3U2C, from the Microchip SAM family. Other key parts include the USBLC6-2SC6, MIC5504-3.3YM5, MIC5504-1.8YM5, PMW3360DM-T2QU and 25LCxxx. By type, the board carries 26 capacitors, 14 resistors, 7 ICs, 7 connectors, 2 inductors and 1 crystal.
From the project
Open source wired mouse hardware
Main components on the Sammy
Sammy bill of materials (BOM)
60 components, 31 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | USBLC6-2SC6 | SOT-23-6 | U1 |
| 1 | MIC5504-3.3YM5 | SOT-23-5 | U2 |
| 1 | MIC5504-1.8YM5 | SOT-23-5 | U3 |
| 1 | ATSAM3U2C | TFBGA-100_9.0x9.0mm_Layout10x10_P0.8mm | U4 |
| 1 | PMW3360DM-T2QU | PMW3360 | U5 |
| 1 | 25LCxxx | DFN-S-8-1EP_6x5mm_P1.27mm | U6 |
| 1 | 74LVC1G17 | SOT-353_SC-70-5 | U7 |
| 1 | 12MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | USB | JST_PH_B5B-PH-K_1x05_P2.00mm_Vertical | J1 |
| 1 | SWD | Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | J2 |
| 1 | Enc | JST_SH_BM03B-SRSS-TB_1x03-1MP_P1.00mm_Vertical | J3 |
| 1 | Side | JST_SH_BM05B-SRSS-TB_1x05-1MP_P1.00mm_Vertical | J4 |
| 1 | LSW | JST_SH_BM03B-SRSS-TB_1x03-1MP_P1.00mm_Vertical | J5 |
| 1 | RSW | JST_SH_BM03B-SRSS-TB_1x03-1MP_P1.00mm_Vertical | J6 |
| 1 | MSW | JST_SH_BM03B-SRSS-TB_1x03-1MP_P1.00mm_Vertical | J7 |
| 1 | 500mA | Fuse_0603_1608Metric_Castellated | F1 |
| 1 | Bypass | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | ~ | ws2812-2020 | D1 |
| 1 | 470R | L_0402_1005Metric | FB1 |
| 1 | ~ | L_0402_1005Metric | FB2 |
Show 11 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 16 | 100nF | C_0402_1005Metric | C1, C2, C3, C4, C6, C7, C8, C9 +8 |
| 5 | 1uF | C_0603_1608Metric | C16, C17, C22, C23, C24 |
| 1 | 4.7uF | C_0603_1608Metric | C19 |
| 2 | 12pF | C_0402_1005Metric | C25, C27 |
| 1 | 10pF | C_0402_1005Metric | C26 |
| 1 | 4.7nF | C_0402_1005Metric | C29 |
| 9 | 100k | R_0402_1005Metric | R1, R5, R6, R7, R8, R9, R10, R12 +1 |
| 2 | 39 | R_0402_1005Metric | R2, R3 |
| 1 | 5.62k | R_0402_1005Metric | R4 |
| 1 | 2.2R | R_0402_1005Metric | R11 |
| 1 | 100 | R_0402_1005Metric | R14 |
Sammy design files
The KiCad project lives in the openinput-fw/sammy repository on GitHub; these links point at the commit this page was built from.
- Layoutpcb/sammy.kicad_pcb
- Schematicpcb/sammy.kicad_sch
Sammy: common questions
What microcontroller does the Sammy use?
The Sammy is built around the ATSAM3U2C, from the Microchip SAM family.
How big is the Sammy PCB?
The Sammy measures 25 × 45 mm, has 4 copper layers and is 0.824 mm thick.
How many components are on the Sammy?
60 components, from 31 distinct parts. The full bill of materials is listed on this page.
Where can I download the Sammy design files?
From the openinput-fw/sammy repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Sammy design in my own project?
Yes, under the terms of its CERN-OHL-P-2.0 license, which openinput-fw chose for the repository.
Can I test firmware for the Sammy without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Microchip SAM firmware against it before you order a PCB.
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