HardLabs

UMDv3

db-electronics·UMDv3-kicad·UMDv3/UMDv3.kicad_pcb

UMDv3 PCB layout, top view — open source STM32 board by db-electronics

About the UMDv3 PCB

UMDv3 is an open source STM32 PCB design by db-electronics, published on GitHub under the CERN-OHL-1.2 license. It is a 2-layer board measuring 147.3 × 83.8 mm, with 67 components from 27 distinct parts.

Its main chip is the STM32F407VET6TR, from the STM32 family. Other key parts include the MCP23008T-E_SS, AZ1117CH-3.3TRG1 and SSD1106-0.96-OLED-I2C. By type, the board carries 27 capacitors, 10 resistors, 8 switches, 5 connectors, 4 ICs and 3 diodes.

It belongs with the retro computing designs in this gallery.

From the project

UMDv3 Kicad PCB

This PCB includes a very performant MCU, STM32F407VET6, which is connected to a generalized databus consisting of 24 address bits and 16 data lines. Along with a dozen or so control signals, it should be sufficient to interface with most cartridge types. Each cartridge type requires a separate PCB for interface, please refer to the main project repository for a list of currently available cartridge apdapters.

Main components on the UMDv3

MCP23008T-E_SSAZ1117CH-3.3TRG1STM32F407VET6TRSSD1106-0.96-OLED-I2C

UMDv3 bill of materials (BOM)

67 components, 27 distinct parts.

QtyPartRefs
1
MCP23008T-E_SS
U101
1
AZ1117CH-3.3TRG1
U102
1
STM32F407VET6TR
U103
1
SSD1106-0.96-OLED-I2C
U104
1
ABLS-8.000MHZ-B4-T
X101
1
USB-B1HSB6
CON101
1
JTAG-2X10-HDR
CON104
1
101-00405-75
CON105
1
UMDv3-CONN
CON106
1
HDR1X3
CON107
6
NSP-4-6-01
MEC101, MEC102, MEC103, MEC104, MEC105, MEC106
8
PTS645SM43SMTR92_LFS
SW101, SW102, SW103, SW104, SW105, SW106, SW107, SW108
2
TP_2.25x3_ROUNDED
TP101, TP102
2
151031VS06000
D101, D102
1
151033RS03000
D103
1
1K@100MHz
FB101
14
0.1uF/50V
C101, C104, C108, C114, C115, C116, C117, C118 +6
2
47uF/10V
C102, C103
2
2.2uF/16V
C105, C106
4
10uF/25V
C107, C125, C126, C127
Show 7 more
QtyPartRefs
2
22pF/50V
C109, C110
3
1uF/16V
C111, C112, C113
1
1.5k
R101
2
2.2k
R102, R103
4
470
R104, R105, R106, R108
2
10k
R107, R111
1
715
R109

UMDv3 design files

The KiCad project lives in the db-electronics/UMDv3-kicad repository on GitHub; these links point at the commit this page was built from.

UMDv3: common questions

What microcontroller does the UMDv3 use?

The UMDv3 is built around the STM32F407VET6TR, from the STM32 family.

How big is the UMDv3 PCB?

The UMDv3 measures 147.3 × 83.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the UMDv3?

67 components, from 27 distinct parts. The full bill of materials is listed on this page.

Where can I download the UMDv3 design files?

From the db-electronics/UMDv3-kicad repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the UMDv3 design in my own project?

Yes, under the terms of its CERN-OHL-1.2 license, which db-electronics chose for the repository.

Can I test firmware for the UMDv3 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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