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BetsyBoardBig

engstad·BetsyBoard

BetsyBoardBig PCB layout, top view — open source STM32 board by engstad
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About the BetsyBoardBig PCB

BetsyBoardBig is an open source STM32 PCB design by engstad, published on GitHub. It is a 4-layer board measuring 48 × 48 mm, with 70 components from 64 distinct parts.

Its main chip is the STM32L486RX-LQFP64, from the STM32 family. Other key parts include the TLV75733PDBVR‎, USBLC6-2SC6, 74LVC3G14, 74LVC1G3157 and IS25LP06D-XB. By type, the board carries 25 capacitors, 15 resistors, 11 connectors, 8 ICs, 3 switches and 3 diodes.

From the project

An STM32L4 prototyping board

BetsyBoardBig, from the project README
From the project README

Main components on the BetsyBoardBig

TLV75733PDBVR‎USBLC6-2SC674LVC3G14STM32L486RX-LQFP6474LVC1G3157IS25LP06D-XBMCP73871

BetsyBoardBig bill of materials (BOM)

70 components, 64 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TLV75733PDBVR‎
U1
1
USBLC6-2SC6
U2
1
74LVC3G14
MCP73871
U3
1
STM32L486RX-LQFP64
74LVC1G08
U4
1
74LVC1G3157
74LVC3G14
U5
1
IS25LP06D-XB
STM32L486Rx-LQFP64
U6
1
74LVC1G3157
U7
1
MCP73871
IS25LP06D-xB
U8
1
XTAL
X1
1
Crystal
Y1
1
USB_C_Receptacle_USB2.0
J1
1
CLOCKS
J2
1
USB_C_RECEPTACLE_USB2.0
SPI
J3
1
I2C
J4
1
I2C
USART3
J5
1
USART3
ANALOG
J6
1
USART1
J7
1
Micro_SD_Card
J8
1
BATT
P1
1
BATT
P2
Show 44 more
QtyPartRefs
1
CORTEX-JTAG
P3
1
BATT
B1
1
Polyfuse
F1
1
JUMPER
SW1
1
TE-FSM4J
SW2
1
SW_PUSH_NO_ALT
SW3
1
RED
D1
1
BLUE
D2
1
GRN
D3
1
220Ω@100MHz
FB1
1
0.1UF
10uF
C1
1
0.1UF
1.0uF
C2
1
1UF
0.1uF
C3
1
1UF
4.7uF
C4
1
1.0UF
1uF
C5
1
0.1UF
1uF
C6
1
16PF
4.7uF
C7
1
16PF
0.1uF
C8
2
12PF
0.1uF
C9, C10
1
0.1UF
1uF
C11
1
1UF
16pF
C12
1
0.1UF
16pF
C13
1
0.1UF
12pF
C14
1
4.7UF
12pF
C15
4
0.1UF
0.1uF
C16, C18, C19, C20
1
0.1UF
4.7uF
C17
1
10UF
0.1uF
C21
2
4.7UF
0.1uF
C22, C23
2
0.1uF
C24, C25
1
10K
330K
R1
1
110K
R2
1
5K1
R3
1
330
5K1
R4
1
10K
R5
1
180
100K
R6
1
330
10K
R7
1
5K1
1K
R8
1
5K1
1M
R9
1
100K
10K
R10
1
10K
1K
R11
1
330
R12
1
330K
180
R13
1
110K
330
R14
1
10K
R15

BetsyBoardBig design files

The KiCad project lives in the engstad/BetsyBoard repository on GitHub; these links point at the commit this page was built from.

BetsyBoardBig: common questions

What microcontroller does the BetsyBoardBig use?

The BetsyBoardBig is built around the STM32L486RX-LQFP64, from the STM32 family.

How big is the BetsyBoardBig PCB?

The BetsyBoardBig measures 48 × 48 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the BetsyBoardBig?

70 components, from 64 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 BetsyBoardBig 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 BetsyBoardBig 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 BetsyBoardBig 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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