Difference between revisions of "STM32 development board"

Latest revision as of 14:33, 17 November 2025

introduction

The BitWizard STM32 development board is an STM32F072 development board that is a bit more compact than the ST Nucleo boards.

It differs from the Nucleo in that it does not try to break out EVERY pin of the chip, just a useful subset. Some pins that have I2C, SPI, or UART functionality are broken out on connectors specifically tailored for that use case. Many other GPIO pins are broken out on standard 2x10 headers.

The board is available for purchase "on request". It cannot compete with the ST Nucleo boards (on price). But if you want one shoot us an Email and we'll sell you one (or more).

For those who want to design an add-on board, the connector positions are given in mil. Mil is 0.001 inch and the postions are referenced on the bottom left corner of the PCB. The mounting holes are 3.0 mm and located at 3,3 mm, 3,47mm, 47,3mm and 47,47mm. The PCB is 50x50 mm.

A "technical drawing" of the board is available here: https://bitwizard.nl/wiki/index.php/File:Stm32_devel_bordje.png

pinout

IO voltage

The "VCCIO" voltage can be set with the jumper "5V/3.3V"

Note that this is "power for the slave device", it does not imply that the outgoing signals will have a 5V level (that's always 3.3V), or that the pins are 5V tolerant.

Position of this connector: X 1850, Y 425 mil. (you may want to know this if you are designing an addon board that requires both 5V and 3.3V.

UART

1 GND
PA10 RX
PA9 TX
4 VCCIO

Position of this connector: X 1475, Y 100 mil.

I2C1

1 GND
PB7 SDA
PB6 SCL
4 VCCIO

Position of this connector: X 1475, Y 500 mil.

I2C2

1 GND
PB11 SDA
PB10 SCL
4 VCCIO

Position of this connector: X 1475, Y 300 mil.

SPI

See elsewhere on this site for the SPI functions of this connector. It is connected to PB12-15.

Position of this connector: X 450, Y 150 mil.

SV2

General purpose IO connector.

1 GND
2 GND
3 PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA15
PB0
PB1
PD2
PB5
PB8
PB9
19 VCCIO
20 VCCIO

Position of this connector: X 125 Y 1100 mil.

SV3

General purpose IO connector.

1 GND
2 GND
3 PC0
4 PC1
5 PC2
6 PC3
7 PC4
8 PC5
9 PC6
10 PC7
11 PC8
12 PC9
13 PC10
14 PC11
15 PC12
16 PC13
17 PC14
18 PC15
19 VCCIO
20 VCCIO

Position of this connector: X 775, Y 1825 mil .

SWD

1 VCC 3.3V
2 SWCK PA14
3 GND
4 SWDAT PA13
5 NRST
6 BOOT0

Position of this connector: X 1850, Y 1025 mil.

@@ Line 5: / Line 5: @@
 It differs from the Nucleo in that it does not try to break out EVERY pin of the chip, just a useful subset. Some pins that have I2C, SPI, or UART functionality are broken out on connectors specifically tailored for that use case. Many other GPIO pins are broken out on standard 2x10 headers.
 The board is available for purchase "on request". It cannot compete with the ST Nucleo boards (on price). But if you want one shoot us an Email and we'll sell you one (or more).
+For those who want to design an add-on board, the connector positions are given in mil. Mil is 0.001 inch and the postions are referenced on the bottom left corner of the PCB.
+The mounting holes are 3.0 mm and located at 3,3 mm, 3,47mm, 47,3mm and 47,47mm. The PCB is 50x50 mm.
+A "technical drawing" of the board is available here: https://bitwizard.nl/wiki/index.php/File:Stm32_devel_bordje.png
 == pinout ==
@@ Line 14: / Line 19: @@
 The "VCCIO" voltage can be set with the jumper "5V/3.3V"
 Note that this is "power for the slave device", it does not imply that the outgoing signals will have a 5V level (that's always 3.3V), or that the pins are 5V tolerant.
+Position of this connector: X 1850, Y 425 mil. (you may want to know this if you are designing an addon board that requires both 5V and 3.3V.
 === UART ===
-(not all pin numbers are typed out fully).
 * 1 GND
@@ Line 23: / Line 29: @@
 * PA9 TX
 * 4 VCCIO
+Position of this connector: X 1475, Y 100 mil.
 === I2C1 ===
-(not all pin numbers are typed out fully).
 * 1 GND
@@ Line 32: / Line 39: @@
 * 4 VCCIO
+Position of this connector: X 1475, Y 500 mil.
 === I2C2 ===
-(not all pin numbers are typed out fully).
 * 1 GND
@@ Line 40: / Line 47: @@
 * PB10 SCL
 * 4 VCCIO
+Position of this connector: X 1475, Y 300 mil.
 === SPI ===
@@ Line 51: / Line 60: @@
 General purpose IO connector.
-(not all pin numbers are typed out fully).
 * 1 GND