BetsyBoard
About the BetsyBoard PCB
BetsyBoard is an open source STM32 PCB design by engstad, published on GitHub. It is a 4-layer board measuring 20.3 × 43.2 mm, with 42 components from 37 distinct parts.
Its main chip is the STM32L486RX-LQFP64, from the STM32 family. Other key parts include the LP5907MFX-3.3, USBLC6-2SC6 and 74LVC3G14. By type, the board carries 18 capacitors, 9 connectors, 4 ICs, 3 resistors, 2 crystals and 2 diodes.
From the project
An STM32L4 prototyping board
Main components on the BetsyBoard
BetsyBoard bill of materials (BOM)
42 components, 37 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LP5907MFX-3.3 | SOT-23-5 | U1 |
| 1 | USBLC6-2SC6 | SOT-23-6 | U2 |
| 1 | 74LVC3G14 APX823 | SOT-23-5 | U3 |
| 1 | STM32L486RX-LQFP64 STM32L486Rx-LQFP64 | QFP-64_10x10_Pitch0.5mm | U4 |
| 1 | XTAL | cstce-v-c | X1 |
| 1 | Crystal | Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | USB_B_Micro | usb-micro-b-amphenol-fci-10118194-oval | J1 |
| 1 | Micro_SD_Card | Molex_PS_105162_001 | J2 |
| 1 | VDD | pin-strip-1 | P1 |
| 1 | VBUS | pin-strip-1 | P2 |
| 1 | CORTEX-JTAG | conn-jtag-0.05 | P3 |
| 1 | Analog | pin-strip-16 | P4 |
| 1 | Digital | pin-strip-16 | P5 |
| 1 | VDD | PinHeader_1x01_P2.54mm_Vertical | P6 |
| 1 | MCO | pin-socket-1 | P7 |
| 1 | Fuse_Small | Fuse_0805_2012Metric | F1 |
| 1 | NET-TIE_2 Net-Tie_2 | net-tie-0.4mm | NT1 |
| 1 | TE-FSM4J RST | tactile-switch-evpay-34x29mm | SW2 |
| 1 | RED | LED_0603_1608Metric | D1 |
| 1 | GREEN | LED_0603_1608Metric | D2 |
Show 17 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 220Ω@100MHz | L_0805_2012Metric | FB2 |
| 2 | 0.1UF 1uF | C_0805_2012Metric | C1, C2 |
| 1 | 1UF 0.1uF | C_0603_1608Metric | C3 |
| 1 | 1UF 10pF | C_0603_1608Metric | C4 |
| 1 | 1.0UF 1.0uF | C_0603_1608Metric | C5 |
| 5 | 0.1UF 0.1uF | C_0603_1608Metric | C6, C11, C14, C16, C17 |
| 1 | 16PF 0.1uF | C_0603_1608Metric | C7 |
| 1 | 16PF 10pF | C_0603_1608Metric | C8 |
| 1 | 12PF 10pF | C_0603_1608Metric | C9 |
| 1 | 12PF 0.1uF | C_0603_1608Metric | C10 |
| 1 | 1UF 4.7uF | C_0805_2012Metric | C12 |
| 1 | 0.1UF 1.0uF | C_0805_2012Metric | C13 |
| 1 | 4.7UF 0.1uF | C_0603_1608Metric | C15 |
| 1 | 0.1UF 10pF | C_0603_1608Metric | C18 |
| 1 | 10k | R_0603_1608Metric | R2 |
| 1 | 470 | R_0603_1608Metric | R3 |
| 1 | 330 470 | R_0603_1608Metric | R4 |
BetsyBoard design files
The KiCad project lives in the engstad/BetsyBoard repository on GitHub; these links point at the commit this page was built from.
BetsyBoard: common questions
What microcontroller does the BetsyBoard use?
The BetsyBoard is built around the STM32L486RX-LQFP64, from the STM32 family.
How big is the BetsyBoard PCB?
The BetsyBoard measures 20.3 × 43.2 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the BetsyBoard?
42 components, from 37 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 BetsyBoard design files?
From the engstad/BetsyBoard 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 BetsyBoard design in my own project?
The repository has no license, so all rights stay with engstad. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the BetsyBoard 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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