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Main

apoluekt·OpenRPNCalc·Hardware/PCBs/Main/main.kicad_pcb

Main PCB layout, top view — open source STM32 board by apoluekt
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About the Main PCB

Main is an open source STM32 PCB design by apoluekt, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 73 × 139 mm, with 121 components from 35 distinct parts.

Its main chip is the STM32U385RGT6Q, from the STM32 family. Other key parts include the TPS61299DRLR, MX25R6435FM2IL0, TLV73333PDBVR, LM66100QDCKRQ1 and NBM5100A. By type, the board carries 51 switches, 25 capacitors, 24 resistors, 7 ICs, 5 inductors and 3 connectors.

It belongs with the science & space designs in this gallery.

From the project

Open-source and open-hardware scientific RPN calculator

PCBs: KiCad design files (schematic and PCBs) for all sevel layers. Where appropriate, Python files are also provided to produce silkscreen labels, place components, and make edge cuts. production: Production files created in KiCad (Gerber files, bill of materials, position files for assembly service) for each of the 7 PCBs. These can normally be submitted to the PCB prototyping service without modifications.

Main components on the Main

STM32U385RGT6QTPS61299DRLRMX25R6435FM2IL0TLV73333PDBVRLM66100QDCKRQ1NBM5100A

Main bill of materials (BOM)

121 components, 35 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32U385RGT6Q
U1
1
TPS61299DRLR
U2
1
MX25R6435FM2IL0
U3
1
TLV73333PDBVR
U4
2
LM66100QDCKRQ1
U5, U6
1
NBM5100A
U7
1
32768 Hz
Y1
1
HARWIN M20-8890545R
J2
1
USB4110-GF-A
J3
1
F3311A7H121010E200
Amphenol
J4
1
BC-2013
MPD
BT1
1
Bootloader
JP1
1
TL1014BF160QG
SW1
1
CUS-12TB
SW2
49
EVPBT1C4A000
SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10 +41
3
NSR0340HT1G
D1, D2, D3
1
1 uH
L1
1
2.2 uH
L2
2
4.7 uH
L3, L4
1
15 uH
L5
Show 15 more
QtyPartRefs
9
100 nF
C1, C3, C5, C6, C8, C10, C12, C13 +1
2
100 uF
C2, C4
3
10 uF
C7, C14, C16
2
47 pF
C9, C11
4
2.2 uF
C17, C18, C24, C25
2
1 uF
C19, C20
1
560 pF
C21
2
0.3F
C22, C23
5
10K
10k
R1, R2, R4, R5, R15
1
0
R3
9
1M
R6, R7, R8, R9, R10, R11, R12, R13 +1
3
100K
100k
R17, R27, R28
2
1k
R18, R23
2
5.1K
5.1k
R19, R24
2
33
R20, R21

Main design files

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

Main: common questions

What microcontroller does the Main use?

The Main is built around the STM32U385RGT6Q, from the STM32 family.

How big is the Main PCB?

The Main measures 73 × 139 mm, has 2 copper layers and is 0.8 mm thick.

How many components are on the Main?

121 components, from 35 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 Main design files?

From the apoluekt/OpenRPNCalc 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 Main design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which apoluekt chose for the repository.

Can I test firmware for the Main 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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