DocID030906 Rev 2
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UM2271
Connectors
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Please, take care that this connector shares many GPIOs with other functions on the Board:
for more detailed information please refer to
Appendix A: GPIO assignment and sharing
In addition, to have a quick look at STMod+ GPIO sharing and multiplexing, and to get a
quick view on other Alternate functions available on its pins, please refer to
STMod+ GPIO sharing and multiplexing
Note:
Limitation: The STMod+ interface is not compatible with JP7 setting at +1V8.
Note:
Limitation: if STMod+ pin 17 is used, please take care to disconnect SB1 first. If STMod+ pin
18/20 is used, please activate MIC_VDD GPIO (PH2) at high level first.
11.7 PMOD
connector
CN3
The standard 12-pin PMOD connector is available on STM32L4R9I-DISCO Discovery board
to support low frequency, low I/O pin count peripheral modules. The PMOD interface which
has been implemented on STM32L4R9I-DISCO Discovery board is compatible with the
PMOD type 2A & 4A I/O signal assignment convention.
Figure 15. PMOD connector CN3
STMod+ pin 3
SPI2_MISOp
USART3_RX
USART3_RX
STMod+ pin 4
SPI2_SCK
SPI2_SCK
USART3_RTS
1. UART / SPI defines default configuration for STMOD+_SEL_0 and STMOD+_SEL_1.
Table 20. Quad SPDT switch configuration (continued)
Pin number
SPI
UART / SPI
(1)
UART
Table 21. PMOD connector CN3
Pin number
Description
Pin number
Description
1
SPI2_CS/USART3_CTS (PA6)
7
INT (PC6)
2
SPI2_MOSIp/USART3_TXD (PB15/PB10)
8
RESET (PI7)
3
SPI2_MISOp/USART3_RXD (PB14/PB11)
9
NA
4
SPI2_SCK/USART3_RTS (PB13/PA15)
10
NA
5
GND
11
GND
6
3V3
12
3V3
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