Motherboard
About the Motherboard PCB
Motherboard is an open source Microchip SAM PCB design by MuddJTS, published on GitHub. It is a 4-layer board measuring 141.5 × 53.8 mm, with 134 components from 67 distinct parts.
Its main chip is the ATSAMD21G18A-AUT, from the Microchip SAM family. Other key parts include the TPS565208, MCP9600, TPS61175, LTC4412 and 74LVC125. By type, the board carries 43 capacitors, 43 resistors, 23 ICs, 8 transistors, 4 connectors and 4 inductors.
Main components on the Motherboard
Motherboard bill of materials (BOM)
134 components, 67 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TPS565208 | TSOT-23-6_HandSoldering | U1 |
| 3 | MCP9600 | QFN-20-1EP_5x5mm_Pitch0.65mm | U2, U3, U4 |
| 1 | TPS61175 | TSSOP-14-1EP_4.4x5mm_P0.65mm | U5 |
| 2 | LTC4412 | TSOT-23-6_HandSoldering | U6, U7 |
| 1 | 74LVC125 | SOIC-14_3.9x8.7mm_Pitch1.27mm | U8 |
| 1 | 74HC86 | SOIC-14_3.9x8.7mm_Pitch1.27mm | U9 |
| 1 | LT1161 | Infineon_PG-DSO-20-32 | U10 |
| 1 | SN74LVC1T45DBV | SOT-23-6 | U12 |
| 1 | LP2985-1.8 | SOT-23-5 | U13 |
| 1 | 74LVC4245A | TSSOP-24_4.4x7.8mm_P0.65mm | U14 |
| 4 | MPU-9250 | InvenSense_QFN-24_3x3mm_P0.4mm | U15, U16, U17, U18 |
| 1 | HX1-114.390-3 | Socket_Strip_Straight_1x07_Pitch2.54mm | U19 |
| 1 | LMR23625C | Diodes_PSOP-8 | U20 |
| 1 | LP3985IM5X-3.0 | SOT-23-5_HandSoldering | U21 |
| 1 | ADXL377 | QFN-16-1EP_3x3mm_Pitch0.5mm | U22 |
| 1 | TSV994A | TSSOP-14_4.4x5mm_P0.65mm | U23 |
| 1 | ATSAMD21G18A-AUT | TQFP-48_7x7mm_P0.5mm | U24 |
| 4 | Q_PMOS_DGS | PowerPAK_SO-8_Single | Q1, Q2, Q3, Q4 |
| 4 | Q_NMOS_DGS | PowerPAK_SO-8_Single | Q5, Q6, Q7, Q8 |
| 1 | Crystal | Crystal_SMD_TXC_9HT11-2pin_2.0x1.2mm | Y1 |
Show 47 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Screw_Terminal_01x08 | IDC-Header_2x04_Pitch2.54mm_Straight | J1 |
| 1 | Screw_Terminal_01x04 | TerminalBlock_bornier-4_P5.08mm | J2 |
| 2 | Conn_Coaxial | Molex_Microcoaxial_RF | J3, J4 |
| 2 | Battery | TerminalBlock_4UCON_19963_02x3.5mm_Straight | BT1, BT2 |
| 1 | Battery_Cell | Seiko_MS621F | BT3 |
| 3 | Thermocouple | TerminalBlock_4UCON_19963_02x3.5mm_Straight | TC1, TC2, TC3 |
| 1 | D | D_SMA | D1 |
| 1 | LED | LED_0805 | D2 |
| 1 | 2.2uH | L_Wuerth_HCM-1240 | L1 |
| 1 | 15uH | L_Wuerth_HCM-1240 | L2 |
| 1 | 2.2µH | L_Wuerth_HCM-1240 | L3 |
| 1 | L | L_0603 | L4 |
| 1 | 100nF | C_0603_1608Metric | C1 |
| 1 | 47uF | C_1206_3216Metric | C2 |
| 1 | 4.7uF | C_0603_1608Metric | C3 |
| 1 | 47nF | C_0603_1608Metric | C4 |
| 1 | 15nF | C_0603_1608Metric | C5 |
| 3 | 10uF | C_0603_1608Metric | C6, C26, C34 |
| 1 | 1uF | C_0603_1608Metric | C7 |
| 15 | 0.1µF | C_0603_1608Metric | C8, C9, C10, C11, C17, C18, C19, C20 +7 |
| 3 | 1µF | C_0603_1608Metric | C12, C13, C14 |
| 2 | 0.01µF | C_0603_1608Metric | C15, C33 |
| 1 | 2.2µF | C_0603_1608Metric | C16 |
| 3 | 0.1uF | C_0603_1608Metric | C25, C32, C38 |
| 1 | 10µF | C_0805_2012Metric | C27 |
| 1 | 2.2µF | C_0805_2012Metric | C28 |
| 1 | 680nF | C_0603_1608Metric | C29 |
| 1 | 11pF | C_0603_1608Metric | C30 |
| 1 | 47µF | C_1206_3216Metric | C31 |
| 3 | 0.05µF | C_0603_1608Metric | C35, C36, C37 |
| 2 | 15pF | C_0603_1608Metric | C39, C40 |
| 1 | 33.2K | R_0603_1608Metric | R1 |
| 15 | 10K | R_0603_1608Metric | R2, R4, R6, R15, R17, R19, R20, R21 +7 |
| 1 | 2.2k | R_0603_1608Metric | R3 |
| 1 | 4.3K | R_0603_1608Metric | R5 |
| 1 | 86.6K | R_0603_1608Metric | R7 |
| 1 | 5.11k | R_0603_1608Metric | R8 |
| 1 | 300k | R_0603_1608Metric | R9 |
| 1 | 16.2k | R_0603_1608Metric | R10 |
| 4 | 50k | R_0603_1608Metric | R11, R12, R16, R18 |
| 2 | 470K | R_0603_1608Metric | R13, R14 |
| 4 | 100K | R_0603_1608Metric | R23, R24, R25, R26 |
| 4 | 1K | R_0603_1608Metric | R31, R32, R33, R34 |
| 4 | 0.01 | R_0805_2012Metric | R35, R36, R37, R38 |
| 1 | 88.7k | R_0603_1608Metric | R39 |
| 1 | 22.1k | R_0603_1608Metric | R40 |
| 1 | 220 | R_0603_1608Metric | R41 |
Motherboard design files
The KiCad project lives in the MuddJTS/Motherboard repository on GitHub; these links point at the commit this page was built from.
- Layoutmotherboard.kicad_pcb
Motherboard: common questions
What microcontroller does the Motherboard use?
The Motherboard is built around the ATSAMD21G18A-AUT, from the Microchip SAM family.
How big is the Motherboard PCB?
The Motherboard measures 141.5 × 53.8 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Motherboard?
134 components, from 67 distinct parts. The full bill of materials is listed on this page.
Where can I download the Motherboard design files?
From the MuddJTS/Motherboard repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Motherboard design in my own project?
The repository has no license, so all rights stay with MuddJTS. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Motherboard 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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