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pmod2rpi-pinout.md

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RPi Pin Assignments

Raspberry Pi 40-Pin Connector GPIO assignment list

RPi Pin-# RPi Pin Name PMOD#-Pin# RPi Pin-# RPi Pin Name PMOD#-Pin#
1 3V3 All (Pin-6) 2 5V -
3 GPIO02 PMOD4-4 4 5V -
5 GPIO03 PMOD4-3 6 GND All (GND Pin-5)
7 GPIO04 PMOD3-7 8 GPIO14 PMOD2-1
9 GND All (GND Pin-5) 10 GPIO15 PMOD3-3
11 GPIO17 PMOD3-4 12 GPIO18 PMOD1-10
13 GPIO27 PMOD4-2 14 GND All (GND Pin-5)
15 GPIO22 PMOD4-1 16 GPIO23 PMOD2-9
17 3V3 All (Pin-6) 18 GPIO24 PMOD2-10
19 GPIO10 PMOD1-2, PMOD2-2 20 GND All (GND Pin-5)
21 GPIO09 PMOD1-3, PMOD2-3 22 GPIO25 PMOD2-10
23 GPIO11 PMOD1-4, PMOD2-4 24 GPIO08 PMOD1-1
25 GND All (GND Pin-5) 26 GPIO07 PMOD2-1
27 ID_SD_EEPROM U1 EEPROM SDA 28 ID_SC_EEPROM U1 EEPROM SCL
29 GPIO05 PMOD3-9 30 GND All (GND Pin-5)
31 GPIO06 PMOD3-10 32 GPIO12 PMOD3-8
33 GPIO13 PMOD2-8 34 GND All (GND Pin-5)
35 GPIO19 PMOD1-7 36 GPIO16 PMOD3-1
37 GPIO26 PMOD1-9 38 GPIO20 PMOD2-7
39 GND All (GND Pin-5) 40 GPIO21 PMOD1-8

PMOD pinout

PMOD1 pin assignment list

Top Row

PMOD Pin# RPi Pin Name RPi Alternate RPi Pin-# XIAO Pin Name XIAO-Pin#
1 GPIO08 SPI0_CE0 24 D7 8
2 GPIO10 SPI0_MOSI 19 D10 11
3 GPIO09 SPI0_MISO 21 D9 (D5) 10
4 GPIO11 SPI0_CLK 23 D8 (D4) 9
5 GND GND 6,9,14... GND 13
6 3V3 - 1,17 3V3 12

Bottom Row

PMOD Pin# RPi Pin Name RPi Alternate RPi Pin-# XIAO Pin Name XIAO-Pin#
7 GPIO19 - 35 D3 4
8 GPIO21 - 40 D2 3
9 GPIO26 - 37 D5 (D9) 6 (10)
10 GPIO18 - 12 D4 (D8) 5 (9)
11 GND - 6,9,14... GND 13
12 3V3 - 1,17 3V3 12

XIAO pins with alternate pins in () are controlled by the "+I2C Pin" DIP switch setting of SW3.

PMOD2 pin assignment list

Top Row

PMOD Pin# RPi Pin Name RPi Alternate RPi Pin-# XIAO Pin Name XIAO-Pin#
1 GPIO07 SPI0_CE1 26 D7 8
2 GPIO10 SPI0_MOSI 19 D10 11
3 GPIO09 SPI0_MISO 21 D9 (D5) 10
4 GPIO11 SPI0_CLK 23 D8 (D4) 9
5 GND GND 6,9,14... GND 13
6 3V3 - 1,17 3V3 12

XIAO pins with alternate pins in () are controlled by the "+I2C Pin" DIP switch setting of SW3.

Bottom Row

PMOD Pin# RPi Pin Name RPi Alternate RPi Pin-#
7 GPIO20 - 38
8 GPIO13 - 33
9 GPIO23 - 16
10 GPIO24 - 18
11 GND - 6,9,14...
12 3V3 - 1,17

The bottom row is not connected to any XIAO pins.

PMOD3 pin assignment list

Top Row

PMOD Pin# RPi Pin Name RPi Alternate RPi Pin-#
1 GPIO16 CTS 36
2 GPIO14 TXD 8
3 GPIO15 RXD 10
4 GPIO17 RTS 11
5 GND GND 6,9,14...
6 3V3 - 1,17

Bottom Row

PMOD Pin# RPi Pin Name RPi Alternate RPi Pin-#
7 GPIO04 - 7
8 GPIO12 - 32
9 GPIO05 - 29
10 GPIO06 - 31
11 GND - 6,9,14...
12 3V3 - 1,17

PMOD4 pin assignment list

Pin Row

PMOD Pin# RPi Pin Name RPi Alternate RPi Pin-#
1 GPIO22 - 15
2 GPIO27 - 13
3 GPIO03 I2C_SCL 5
4 GPIO02 I2C_SDA 3
5 GND GND 6,9,14...
6 3V3 - 1,17