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OSSI CM2

transistorgrab·OSSI·circuits/OSSI_CM2V2.0/OSSI_CM2.kicad_pcb

OSSI CM2 PCB layout, top view — open source STM32 board by transistorgrab

About the OSSI CM2 PCB

OSSI CM2 is an open source STM32 PCB design by transistorgrab, published on GitHub under the MIT license. It is a 4-layer board measuring 49.5 × 54.9 mm, with 80 components from 25 distinct parts.

Its main chip is the STM32L412C8T6, from the STM32 family. Other key parts include the M24M01, LM75B and P. By type, the board carries 39 resistors, 26 capacitors, 4 ICs, 4 crystals, 1 diode and 1 inductor.

It belongs with the power & battery designs in this gallery.

From the project

Open Source Solar Inverter - Software, Hardware, Mechanics

This version of the control module contains various improvements over version 1.0/1.1 of the module.

However, the module footprint still shows the same pin mapping as before.

The package of the 8 pin ICs on the module are now changed to TSSOP to improve use of board space.

Main components on the OSSI CM2

STM32L412C8T6M24M01LM75BP

OSSI CM2 bill of materials (BOM)

80 components, 25 distinct parts.

QtyPartRefs
1
STM32L412C8T6
U101
1
M24M01
U102
1
LM75B
U103
1
P
OPA2317
M
U104
1
P
PINHEADER_2×5
M
X101
1
Conn_01x20_Pin
X201
1
Conn_01x21_Pin
X202
1
P
10MHz
M
Y101
2
Solder_bridge_open
BOOT0, RESET0
1
P
LED gn
M
H140
1
P
LED rd
M
H141
1
STARPOINT
STAR101
1
P
LM4030
M
D101
1
P
Ferrite
M
L101
2
P
12p
M
C101, C102
10
P
10n
M
C103, C104, C105, C106, C107, C109, C110, C112 +2
9
P
100n
M
C108, C111, C113, C115, C116, C117, C120, C122 +1
5
P
1µ/6.3V
M
C114, C118, C121, C123, C124
5
P
10k
M
R101, R111, R131, R136, R137
27
P
220
M
R102, R103, R104, R105, R106, R107, R108, R109 +19
Show 5 more
QtyPartRefs
1
P
1M0
M
R110
1
P
0R0
M
R116
2
P
4k7
M
R127, R128
1
P
3k3
M
R129
2
P
1k0
M
R132, R133

OSSI CM2 design files

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

OSSI CM2: common questions

What microcontroller does the OSSI CM2 use?

The OSSI CM2 is built around the STM32L412C8T6, from the STM32 family.

How big is the OSSI CM2 PCB?

The OSSI CM2 measures 49.5 × 54.9 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the OSSI CM2?

80 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the OSSI CM2 design files?

From the transistorgrab/OSSI repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the OSSI CM2 design in my own project?

Yes, under the terms of its MIT license, which transistorgrab chose for the repository.

Can I test firmware for the OSSI CM2 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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