3.4.4 GPIO Interface

The SAM9X75-Curiosity board features a 40-pin connector (J27) (Raspberry Pi compatible(1)) for free use.

Note:
  1. Raspberry Pi is a trademark of Raspberry Pi Trading.

The following figure shows the 40-pin connector interface.

Figure 3-26. 40-pin Connector Interface

The following table shows the 40-pin connector the signal description.

Table 3-13. 40-pin Connector Signal Description
Pin No. PIO Signal Name Signal Description
1 – VDD_3V3 3.3V
2 – 5V_MAIN 5V
3 PC0 RPi_GPIO2_I2C_SDA_PC0 TWI Data
4 – 5V_MAIN 5V
5 PC1 RPi_GPIO3_I2C_SCL_PC1 TWI Clock
6 – GND GND
7 PB25 RPi_GPIO4_I2S_MCK/GPCLK0_PB25 I2S Host Clock
8 PA16 RPi_GPIO14_MPU32_TXD_PA16 UART Transmit
9 – GND GND
10 PA15 RPi_GPIO15_MPU32_RXD_PA15 UART Receive
11 – NC Not Connected
12 PB26 RPi_GPIO18_I2S_BCLK_PB26 I2S Clock
13 – NC Not Connected
14 – GND GND
15 – NC Not Connected
16 PA21 RPi_GPIO23_PA21 General Purpose I/O
17 – VDD_3V3 3.3V
18 PA22 RPi_GPIO24_PA22 General Purpose I/O
19 PC22 RPi_GPIO10_SPI_MOSI_PC22 SPI MOSI
20 – GND GND
21 PC23 RPi_GPIO9_SPI_MISO_PC23 SPI MISO
22 – NC Not Connected
23 PC26 RPi_GPIO11_SPI_SCK_PC26 SPI Clock
24 PC25 RPi_GPIO8_SPI_NPCS0_PC25 SPI Chip Select
25 – GND GND
26 – NC Not Connected
27 – NC Not Connected
28 – NC Not Connected
29 – NC Not Connected
30 – GND GND
31 – NC Not Connected
32 – NC Not Connected
33 PC20 RPi_GPIO13_PWM1_PC20 Pulse Width Modulated
34 – GND GND
35 PB15 RPi_GPIO19_I2S_WS_PB15 I2S Word Select
36 – NC Not Connected
37 – NC Not Connected
38 PB16 RPi_GPIO20_I2S_DIN_PB16 I2S Data IN
39 – GND GND
40 PB17 RPi_GPIO21_I2S_DOUT_PB17 I2S Data OUT