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Interface Signals
Pin FunctionPin NumberPin Function
VCC_3V3MEM12VDD_5V0
I2C1_SDA34VDD_5V0
I2C1_SCL56GND
ECSPI2SPI2_MOSI78UART3_TX
GND910UART3_RX
ECSPI2SPI2_SCLK1112SAI2_TX_BCLK
ECSPI2SPI2_MISO1314GND
ECSPI2SPI2_SS01516GPIO1_IO15
VCC_3V3MEM1718GPIO1_IO14
ECSPI3SPI3_MOSI1920GND
ECSPI3SPI3_MOSI2122GPIO5_IO11
ECSPI3SPI3_SCLK2324ECSPI3SPI3_SS0
GND2526ECSPI3SPI3_SS2
I2C4_SDA2728I2C4_SCL
GPIO5_IO142930GND
PWM2_OUT3132SAI2_RX_BCLK
ECSPI1SPI1_MISO3334GND
SAI2_TX_SYNC3536ECSPI1SPI1_SS0
ECSPI1SPI1_SCLK3738ECSPI1SPI1_MOSI
GND3940SAI2_TX_DATA0


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The 40-pin header also features a method to toggle the selection of specific Raspberry Pi-compatible interface signals to certain pins to support different Raspberry Pi HATs using soldered jumpers. The following table details the pins and signals that the jumpers control:

JumperPinDefault SignalAlternative Signal
J531PWM2_OUTSD2SAI2_TX_DATA1BCLK
J633SPI1_MISOSD2SAI2_TX_DATA2SYNC
J735SD2_DATA2SPI1_MISO
J837SPI1_SCLKSD2SAI2_TX_DATA3DATA0
J940SD2_DATA3SPI1_SCLK
J1012SD2_DATA1PWM2_OUT
J1129GPIO5_IO14SPI1_MOSISD2_DATA0
J1238SD2SPI1_DATA0MOSISPI1GPIO5_MOSIIO14

ARM JTAG 20-pin Debug Interface Header

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