Arduino Connectors

SAMC21N Xplained Pro implements Arduino shield connectors based on the Arduino Uno. All references to Arduino pin names are taken from the official Arduino schematics of the Arduino Uno.

CAUTION: The target section of SAMC21N Xplained Pro can be powered by 3.3V or 5.0V. The maximum voltage the I/O pins can tolerate depends on the supply voltage. Providing higher voltages like 5V to an I/O pin when the ATSAMC21N18A is powered by 3.3V could damage the board.
Info: Note that all pins do not have the exact same functionality as on the Arduino Uno on the shield connectors. Each shield should be checked for compatibility before it is connected.
Table 1. J802 - Power
Pin on J802 SAMC21N pin Arduino pin name Function Shared functionality
1 - RFU - -
2 - IOREF VCC_TARGET_P3V3_P5V0 -
3 RESETN RESET TARGET_RESET -
4 - 3.3V VCC_P3V3 -
5 - 5V VCC_P5V0 -
6 - GND GND -
7 - GND GND -
8 - VIN VCC_EXT_P5V0 -
Table 2. J803 - Analog
Pin on J803 SAMC21N pin Arduino pin name Function Shared functionality
1 PB09 ADC0 ADC0_AIN3 or SDADC_INP[1] or Y[15] EXT1
2 PB08 ADC1 ADC0_AIN2 or SDADC_INN[1] or Y[14] EXT1
3 PC00 ADC2 ADC0_AIN8 -
4 PC01 ADC3 ADC0_AIN9 -
5 PC02 ADC4 ADC0_AIN10 -
6 PC03 ADC5 ADC0_AIN11 -
Table 3. J804 - Digital Low
Pin on J804 SAMC21N pin Arduino pin name Function Shared functionality
1 PB25 D0 / RX0 SERCOM0 PAD[1] UART RX -
2 PB24 D1 / TX0 SERCOM0 PAD[0] UART TX -
3 PC20 D2 GPIO -
4 PA14 D3 TC3/WO[0] Crystal Foot Print
5 PC21 D4 GPIO -
6 PA15 D5 TC3/WO[1] Crystal Foot Print
7 PB30 D6 TC0/WO[0] EXT2
8 PB04 D7 GPIO -
Table 4. J801 - Digital High
Pin on J801 SAMC21N pin Arduino pin name Function Shared functionality
1 PC26 D8 GPIO -
2 PB31 D9 TC0/WO[1] EXT2
3 PB18 D10 / SPI-SS GPIO (SPI SS) -
4 PC14 D11 / SPI-MOSI SERCOM7 PAD[2] SPI MOSI EXT3, EDBG SPI, and Shield2
5 PC12 D12 / SPI-MISO SERCOM7 PAD[0] SPI MISO EXT3, EDBG SPI, and Shield2
6 PC11 D13 / SPI-SCK SERCOM7 PAD[3] SPI SCK EXT3, EDBG SPI, and Shield2
7 - GND - -
8 PA03 AREF ADC/VREFA or DAC/VREFB  
9 PA16 D14/SDA SERCOM1 PAD[0] I2C SDA EXT2, EXT3, Crypto Device, and 2EDBG IC
10 PA17 D15/SCL SERCOM1 PAD[1] I2C SCL EXT2, EXT3, Crypto Device, and 2EDBG IC
Table 5. J800 - SPI
Pin on J800 SAMC21N pin Arduino pin name Function Shared functionality
1 PC12 MISO SERCOM7 PAD[0] SPI MISO EXT3, EDBG SPI, and Shield
2 - 5V VCC_TARGET_P3V3_P5V0 -
3 PC11 SCK SERCOM7 PAD[3] SPI SCK EXT3, EDBG SPI, and Shield
4 PC14 MOSI SERCOM7 PAD[2] SPI MOSI EXT3, EDBG SPI, and Shield
5 RESETN RESET TARGET_RESET -
6 - GND GND -
Parent topic: Connectors