ST STM32F072

UM1690 Rev 3 17/27
UM1690 Hardware layout
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Table 6. Extension and RF EEPROM connector (CN3)
Pin CN3 Designation
1 I2C SDA Data signal for I
2
C
2 NC Not connected
3 I2C SCL Clock signal for I
2
C
4 EXT_RESET Reset signal for extension board
5 3V 3 volt power supply
6 NC Not connected
7 GND Ground
8 5V 5 volt power supply