OLIMEX© 2018
STM32-H407 user's manual
6.2 SD/MMC slot
The microSD card slot is a standard 8pin connector.
We have tested a number of microSD cards on the STM32-H407 boards and all of them worked
fine regardless manufacturer or capacity. However, keep in mind that some of the lower quality
microSD cards might draw too much current from the slot which might cause power-state problems.
If you suspect the microSD card is causing problems please try using another one of better quality
for better results.
microSD card connector
Pin #
Signal Name
1
DAT2/RES
2
CD/DAT3/CS
3
CMD/DI
4
VDD
5
SCL/SCLK
6
VSS
7
DAT0/RES
8
DAT1/RES
Notice that the pad numeration is written at the bottom of STM32-H407 under the microSD card
connector.
When removing the card, please make sure that you release it from the connector by pushing and
NOT by pulling the card directly (this can damage both the connector and the microSD card).
6.3 UEXT module
STM32-H407 board has UEXT connector and can interface Olimex's UEXT modules.
For more information on UEXT please visit:
https://www.olimex.com/Products/Modules/UEXT/
UEXT connector
Pin #
Wire Name
Microcontroller port
1
3.3V
-
2
GND
-
3
PC6/USART6_TX
PC6
4
PC7/USART6_RX
PC7
5
PB8/I2C1_SCL
PB8
6
PB9/I2C1_SDA
PB9
Page 15 of 30
