Board
About the Board
Board is an open source STM32 PCB design by notaroomba, published on GitHub. It is a 4-layer board measuring 45 × 80 mm, with 174 components from 78 distinct parts.
Its main chip is the STM32WB55RGV6, from the STM32 family. Other key parts include the C181475, C528617, C2070970, COS8054TR and 74HC4051. By type, the board carries 72 capacitors, 45 resistors, 15 ICs, 12 inductors, 11 diodes and 6 transistors.
It belongs with the power & battery designs in this gallery.
From the project
A custom EMR tablet!
- ~500kHz scanning rate - Large (170x110mm) drawing area - Bluetooth support (via STM32) - USB-C for data and charging - ~~Pen~~ (for another version)
- 3D printed parts: a base and a top cover - Snap-fit case
- STM32WB55RGV6TR for bluetooth support - LiPo battery charging circuit - USB-C - 2 ground planes - FPC touchpad
The PCB has 2 components, the FPC coil grid and the main board.
Main components on the Board
Board bill of materials (BOM)
174 components, 78 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32WB55RGV6 | QFN-68-1EP_8x8mm_P0.4mm_EP6.4x6.4mm | U1 |
| 1 | C181475 ~ TI(德州仪器) | QFN-24_L4.0-W4.0-P0.50-TL-EP2.7 | U2 |
| 1 | C528617 ~ TI(德州仪器) | DSBGA-9_L1.7-W1.6-R3-C3-P0.50-BL | U4 |
| 1 | C2070970 ~ TI(德州仪器) | DSBGA-6_L1.4-W1.1-R3-C2-P0.40-BL | U5 |
| 1 | COS8054TR | TSSOP-14_4.4x5mm_P0.65mm | U6 |
| 6 | 74HC4051 | TSSOP-16_4.4x5mm_P0.65mm | U7, U8, U9, U10, U11, U12 |
| 1 | SN74LV1T125DCKR | SC-70-5_L2.1-W1.3-P0.65-LS2.1-TL | U13 |
| 1 | USBLC6-2P6 | SOT-666 | U14 |
| 1 | FAN48610BUC50X | WLCSP-9_L1.2-W1.2-R3-C3-P0.40-BL | U15 |
| 1 | RS3221-3.3YUTDN4 | UTDFN-4_L1.0-W1.0-P0.63-BL-EP-1 | U16 |
| 3 | AO3400A | SOT-23 | Q1, Q2, Q3 |
| 1 | C155524 ~ DIODES(美台) | SOT-523-3_L1.6-W0.8-P1.00-LS1.6-BR | Q4 |
| 1 | C460232 ~ DIODES(美台) | SOT-363_L2.0-W1.3-P0.65-LS2.1-BL | Q5 |
| 1 | C177033 ~ DIODES(美台) | SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | Q6 |
| 1 | XL7EL89CKI-111YLC-32M | CRYSTAL-SMD_4P-L2.0-W1.6-BL | X1 |
| 1 | FC-12M32.768KHZ7PF20PPM | FC-12M_L2.0-W1.2 | X2 |
| 3 | CONN_01X26_MOUNTINGPIN Conn_01x26_MountingPin | Hirose_FH12-26S-0.5SH_1x26-1MP_P0.50mm_Horizontal | J2, J3, J4 |
| 1 | CONN_01X03 Conn_01x03 | JST_EH_S3B-EH_1x03_P2.50mm_Horizontal | J5 |
| 1 | 2450AT18A100E | ANT-SMD_L3.2-W1.6 | AE1 |
| 1 | MLPF-WB55-01E3 | FILTER-SMD_6P-L1.6-W1.0-P0.50-BL | FL2 |
Show 58 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ~ | SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP1 |
| 2 | SW_Push | SW_SPST_CK_RS282G05A3 | SW1, SW2 |
| 1 | SKRTLAE010 | KEY-SMD_SKRTLAE010 | SW3 |
| 1 | C2765186 TYPE-C 16PIN 2MD(073) | USB-C-SMD_TYPE-C-6PIN-2MD-073 | USB1 |
| 1 | 1N4148WT | D_SOD-523 | D1 |
| 2 | PESD15VL1BA | D_SOD-323_TVS | D3, D4 |
| 7 | BAT54J | D_SOD-323F | D5, D6, D7, D8, D9, D10, D11 |
| 1 | BAT54SW | SOT-323_SC-70 | D12 |
| 5 | 100R | L_0603_1608Metric | FB1, FB2, FB3, FB4, FB5 |
| 1 | 10UH 10uH | L_0603_1608Metric | L1 |
| 1 | 1UH 1uH | L_0603_1608Metric | L4 |
| 2 | 470NH 470nH | L_0603_1608Metric | L5, L6 |
| 1 | C85834 60R / Short | L_0603_1608Metric | L7 |
| 1 | EXC14CE900U | FILTER-SMD_4P-L0.9-W0.7-P0.50-BL | L8 |
| 1 | 470NH 470nH | L_Murata_DFE201610P | L9 |
| 15 | 100NF 100nF | C_0402_1005Metric | C1, C2, C3, C4, C6, C10, C11, C14 +7 |
| 1 | 4.7PF 4.7pF | C_0402_1005Metric | C5 |
| 11 | 1UF 1uF | C_0402_1005Metric | C7, C9, C12, C22, C23, C24, C25, C56 +3 |
| 1 | 10NF 10nF | C_0402_1005Metric | C8 |
| 4 | 4.7UF 4.7uF | C_0402_1005Metric | C13, C15, C57, C69 |
| 2 | 3.9NF 3.9nF | C_0402_1005Metric | C16, C19 |
| 2 | 3.6NF 3.6nF | C_0603_1608Metric | C17, C27 |
| 2 | 68NF 68nF | C_0402_1005Metric | C18, C73 |
| 1 | 0.8PF 0.8pF | C_0402_1005Metric | C20 |
| 1 | 0.3PF 0.3pF | C_0402_1005Metric | C21 |
| 1 | 1NF 1nF | C_0402_1005Metric | C26 |
| 2 | 470PF 470pF | C_0402_1005Metric | C28, C43 |
| 7 | 120PF 120pF | C_0402_1005Metric | C29, C30, C32, C33, C35, C36, C72 |
| 9 | 10UF 10uF | C_0402_1005Metric | C31, C44, C55, C59, C60, C61, C62, C70 +1 |
| 1 | 560PF 560pF | C_0402_1005Metric | C34 |
| 2 | 1UF 1uF | C_0603_1608Metric | C37, C38 |
| 1 | 33PF 33pF | C_0402_1005Metric | C39 |
| 2 | 100NF 100nF | C_0603_1608Metric | C40, C41 |
| 1 | 220PF 220pF | C_0402_1005Metric | C42 |
| 1 | 22UF 22uF | C_0402_1005Metric | C45 |
| 1 | 47NF 47nF | C_0402_1005Metric | C58 |
| 3 | 2.2UF 2.2uF | C_0402_1005Metric | C63, C67, C68 |
| 1 | 470NF 470nF | C_0402_1005Metric | C64 |
| 2 | 5.1K | R_0402_1005Metric | R1, R2 |
| 12 | 10K 10k | R_0402_1005Metric | R9, R10, R11, R15, R21, R25, R29, R34 +4 |
| 4 | 1k | R_0402_1005Metric | R12, R14, R16, R23 |
| 2 | 400 | R_0402_1005Metric | R13, R51 |
| 4 | 12K | R_0402_1005Metric | R17, R19, R22, R26 |
| 1 | 0 | R_0402_1005Metric | R18 |
| 1 | 560 | R_0402_1005Metric | R20 |
| 1 | 200 | R_0402_1005Metric | R24 |
| 3 | 100 | R_0402_1005Metric | R27, R30, R35 |
| 1 | 15K 15k | R_0402_1005Metric | R28 |
| 2 | 1.5K | R_0402_1005Metric | R31, R32 |
| 1 | 4.7K | R_0402_1005Metric | R33 |
| 1 | 470 | R_0402_1005Metric | R37 |
| 1 | 30.1K | R_0402_1005Metric | R38 |
| 1 | 5.23K | R_0402_1005Metric | R39 |
| 1 | WW25WR010FTL | R2512 | R42 |
| 1 | DNP | R_0402_1005Metric | R43 |
| 2 | 1.5 | R_0402_1005Metric | R44, R45 |
| 2 | 3.3 | R_0402_1005Metric | R46, R47 |
| 2 | 100K | R_0402_1005Metric | R48, R49 |
Board design files
The KiCad project lives in the notaroomba/linea repository on GitHub; these links point at the commit this page was built from.
Board: common questions
What microcontroller does the Board use?
The Board is built around the STM32WB55RGV6, from the STM32 family.
How big is the Board?
The Board measures 45 × 80 mm, has 4 copper layers and is 1 mm thick.
How many components are on the Board?
174 components, from 78 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Board design files?
From the notaroomba/linea repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Board design in my own project?
The repository has no license, so all rights stay with notaroomba. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Board 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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