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Christmas tree

azonenberg·misc-devboards·christmas-tree/christmas-tree.kicad_pcb

Christmas tree PCB layout, top view — open source STM32 board by azonenberg
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About the Christmas tree PCB

Christmas tree is an open source STM32 PCB design by azonenberg, published on GitHub under the BSD-3-Clause license. It is a 2-layer board measuring 66 × 93.5 mm, with 61 components from 22 distinct parts.

Its main chip is the STM32L031-QFN32, from the STM32 family. Other key parts include the NCP45525IMNTWG-H, 74LVC1T45, 19-C47/RSGHBHC-5V01/2T and ZLDO1117-33. By type, the board carries 19 capacitors, 15 resistors, 12 ICs, 10 diodes, 3 connectors and 1 fuse.

It belongs with the dev boards & breakouts designs in this gallery.

From the project

Miscellaneous prototype hardware that wasn't major enough to warrant a dedicated repo

Main components on the Christmas tree

NCP45525IMNTWG-H74LVC1T4519-C47/RSGHBHC-5V01/2TSTM32L031-QFN32ZLDO1117-33

Christmas tree bill of materials (BOM)

61 components, 22 distinct parts.

QtyPartRefs
1
NCP45525IMNTWG-H
U1
1
74LVC1T45
U2
8
19-C47/RSGHBHC-5V01/2T
U3, U4, U5, U6, U7, U8, U10, U11
1
STM32L031-QFN32
U9
1
ZLDO1117-33
U12
1
USB_C_Receptacle_USB2.0
J1
1
CORTEX_DEBUG_ETM
J2
1
CONN_01X03
J3
1
1A
F1
5
RED
D1, D2, D3, D4, D5
5
GREEN
D6, D7, D8, D9, D10
1
BLM31KN271SN1L
L1
13
0.47 uF
C1, C4, C5, C6, C7, C8, C9, C10 +5
2
DNP
C2, C3
3
4.7 uF
C12, C17, C18
1
0.1 uF
C19
2
5.1k
R1, R2
1
0
R3
1
10K
R4
5
4.7K
R5, R6, R7, R8, R9
Show 2 more
QtyPartRefs
5
33K
R10, R11, R12, R13, R14
1
DNP
R15

Christmas tree design files

The KiCad project lives in the azonenberg/misc-devboards repository on GitHub; these links point at the commit this page was built from.

Christmas tree: common questions

What microcontroller does the Christmas tree use?

The Christmas tree is built around the STM32L031-QFN32, from the STM32 family.

How big is the Christmas tree PCB?

The Christmas tree measures 66 × 93.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Christmas tree?

61 components, from 22 distinct parts. The full bill of materials is listed on this page.

Where can I download the Christmas tree design files?

From the azonenberg/misc-devboards repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Christmas tree design in my own project?

Yes, under the terms of its BSD-3-Clause license, which azonenberg chose for the repository.

Can I test firmware for the Christmas tree 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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