2.4.2

STMod+ connector

Figure 19. STMod+ connector top views

20

PCB

Edge

Border

Daughterboard

Host board

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

PCB

Edge

Border

7.62 mm

2.77 mm

Male connector

Female connector

Table 2. STMod+ connector pin assignments and descriptions

STMod+ Pin number

Function(1) of the primary host mapped

Description

1 SPIx_NSS(2) / UARTy_CTS

Output / Input

2 SPIx_MOSIp(3) / UARTy_TX Output / Output

Output / Output

3 SPIx_MISOp(4) / UARTy_RX Input / Input

Input / Input

4 SPIx_SCK / UARTy_RTS Output / Output

Output / Output

5 GND Ground Reference

Ground reference

6 +5 V Power Supply(5)

Power supply

7 I2Cz_SCL Input / Output

Input / Output

8 SPIx_MOSIs(3) Output

Output

9 SPIx_MISOs(4) Input / Output

Input / Output

10 I2Cz_SDA Input / Output

Input / Output

11 INT(6) Input

Input

12 RESET Output

Output

13 ADC Input

Input

14 PWM Output

Output

15 +5 V Power Supply(5)

Power supply

16 GND Ground Reference

Ground reference

17 GPIO(7)

Output / Input

18 GPIO(7)

Output / Input

19 GPIO(7)

Output / Input

20 GPIO(7)

Output / Input

1. If two functions are provided on a STMod+ connector pin, you can connect two different I/O ports from STM32: the firmware

manages the conflicts that may arise. MOSIs means used in Serial Daisy Chained-SPI mode and MOSIp means used in

Parallel SPI mode. More alternate functions may be available from STM32, refer to the User manual of the host board and

the corresponding STM32 datasheet available on www.st.com.

2. Instead of SPIx_NSS, a GPIO can be used as SPI Chip Select.

3. Pins 2 and 8 are the same SPIx_MOSI signals, but they must come from two different I/O ports.

4. Pins 3 and 9 are the same SPIx_MISO signals, but they must come from two different I/O ports.

UM2777

Buttons, LEDs and connectors

UM2777 - Rev 4

page 17/44