Connectors
UM2271
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DocID030906 Rev 2
please refer to ST Fanout board user manual and to relevant datasheets of associated
modules.
For details about STMod+ interface, please refer to STMod+ connector interface
specification.
Figure 14. STMod+ connector CN1
In order to be able to support selection of SPI or UART functions connection on STMod+ by
software, a quad SPDT switch has been added. It is controlled by two GPIOs from MFX
circuit and enables MCU signal selection for pins 2, 3 and 4. By default, STMod+ connector
is selected, and STMOD+_SEL_0 and STMOD+_SEL_1 of MFX circuit are set to support
one of the STMod+ interface configuration.
Table 19. STMod+ connector CN1
Pin
number
Description
Pin
number
Description
1
SPI2_CS/USART3_CTS (PA6)
11
INT (PC6)
2
SPI2_MOSIp/USART3_TXD (PB15/PB10)
12
RST (PI7)
3
SPI2_MISOp/USART3_RXD (PB14/PB11)
13
ADC (PA4)
4
SPI2_SCK/USART3_RTS (PB13/PA15)
14
PWM (PA5)
5
GND
15
+5V
6
+5V
16
GND
7
I2C3_SCL (PG7)
17
GPIO (PB12)
8
SPI2_MOSIs (PI3)
18
GPIO (PC2)
9
SPI2_MISOs (PI2)
19
GPIO (PC7)
10
I2C3_SDA (PG8)
20
GPIO (PC2)
06Y9
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Table 20. Quad SPDT switch configuration
Pin number
SPI
UART / SPI
(1)
UART
STMOD+_SEL_0 (GPIO6 of MFX_V3)
0
1
1
STMOD+_SEL_1 (GPIO7 of MFX_V3)
0
0
1
STMod+ pin 1 (directly connected to PA6)
SPI_CS
SPI_CS
USART3_CTS
STMod+ pin 2
SPI2_MOSIp
USART3_TX
USART3_TX
