HardLabs

Otter-Iron

Jana-Marie·Otter-Iron·KiCAD/Otter-Iron/TS100C.kicad_pcb

Otter-Iron PCB layout, top view — open source STM32 board by Jana-Marie

About the Otter-Iron PCB

Otter-Iron is an open source STM32 PCB design by Jana-Marie, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 84 × 10 mm, with 63 components from 30 distinct parts.

Its main chip is the STM32F072CBUX, from the STM32 family. Other key parts include the USBLC6-4SC6, AP2204R-3.3, STUSB4500QTR, OPA340NA and MCP9700AT-ETT. By type, the board carries 24 resistors, 22 capacitors, 7 ICs, 5 connectors, 2 transistors and 2 switches.

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

From the project

A TS100 USB-PD replacement PCB.

Main components on the Otter-Iron

USBLC6-4SC6AP2204R-3.3STUSB4500QTRSTM32F072CBUXOPA340NAMCP9700AT-ETTSI8540

Otter-Iron bill of materials (BOM)

63 components, 30 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
USBLC6-4SC6
U1
1
AP2204R-3.3
U2
1
STUSB4500QTR
U3
1
STM32F072CBUX
STM32F072CBUx
U4
1
OPA340NA
U5
1
MCP9700AT-ETT
U6
1
SI8540
U7
1
SS8050
Q1
1
DMP3017SFG
Q2
1
USB_C_RECEPTACLE_USB2.0
USB_C_Receptacle_USB2.0
J1
1
OLED_96X16
OLED_64x32
J2
1
534-3621
A
J3
1
534-3622
B
J4
1
DNP
J5
1
KEY1
key1
SW1
1
KEY2
key2
SW2
1
B140-E3
D3
4
1μF 25V
C1, C4, C9, C11
10
0.1μF
C2, C3, C5, C6, C7, C8, C10, C18 +2
6
1μF 25V
C12, C13, C14, C15, C19, C20
Show 10 more
QtyPartRefs
1
18P
18p
C16
1
DNP
C17
2
560K
560k
R1, R11
2
100K
100k
R2, R17
14
2K37
2k37
R3, R4, R5, R6, R7, R8, R9, R10 +6
1
750K
750k
R15
1
20
R19
2
33
R20, R21
1
10M
10m
R22
1
2k37
R24

Otter-Iron design files

The KiCad project lives in the Jana-Marie/Otter-Iron repository on GitHub; these links point at the commit this page was built from.

Otter-Iron: common questions

What microcontroller does the Otter-Iron use?

The Otter-Iron is built around the STM32F072CBUX, from the STM32 family.

How big is the Otter-Iron PCB?

The Otter-Iron measures 84 × 10 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Otter-Iron?

63 components, from 30 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 Otter-Iron design files?

From the Jana-Marie/Otter-Iron 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 Otter-Iron design in my own project?

Yes, under the terms of its GPL-3.0 license, which Jana-Marie chose for the repository.

Can I test firmware for the Otter-Iron 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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