SAM D21 Xplained Pro Evaluation Kit

The Atmel® SAM D21 Xplained Pro evaluation kit is ideal for evaluating and prototyping with the Atmel SAM D21 ARM® Cortex®-M0+ based microcontrollers. Several extension boards that add functionality to the SAM D21 Xplained Pro, such as WiFi & Bluetooth connectivity, motion sensing, displaye etc. can be purchased separately.

Supported by the Atmel Studio integrated development platform, the kit provides easy access to the features of the Atmel SAMD21J18A microcontroller and explains how to integrate the device in a custom design. The Xplained Pro MCU series evaluation kits include an on-board Embedded Debugger and no external tools are necessary to program or debug the SAMD21J18A MCU. The Xplained Pro extension kits offers additional peripherals to extend the features of the board and ease the development of custom designs

Key features of the SAMD21-XPRO board

  • SAMD21J18A microcontroller
  • One mechanical reset button
  • One mechanical user pushbutton (wake-up, bootloader entry or general purpose)
  • One yellow user LED
  • 32.768kHz crystal
  • USB interface, device and reduced host mode
  • 8 Mbit Serial Flash
  • 3 Xplained Pro extension headers
  • Embedded Debugger
    • Auto-ID for board identification in Atmel Studio 6.1
    • One yellow status LED
    • One green board power LED
    • Symbolic debug of complex data types including scope information
    • Programming and debugging
    • Data Gateway Interface: SPI, I²C, 4 GPIOs
    • Virtual COM port (CDC)
  • USB powered


Please note that the SAMD21-XPRO does not yet support drag'n'drop programming. Use the Free Atmel Studio IDE to program & debug the board.


Key parameters for SAMD21J18A

Flash (Kbytes)256 Kbytes
SRAM (Kbytes)32
Pin Count64
TWI (I2C)6
32kHz RTCYes
PWM Channels24
ADC Channels20
Analog Comparators2
# of Touch Channels256
Max I/O Pins52
Operating Voltage (Vcc)1.62 to 3.63
Temp. Range (deg C)-40 to 85
USB InterfaceHost, Device
Max. Operating Freq. (MHz)48 MHz
ADC Speed (ksps)350
ADC Gain StageYes
Temp. SensorYes
Crypto EngineNo
MPU / MMUno / no
RTCRTC/Counter, Clock+Cal
Calibrated RC OscillatorYes
Hardware QTouch AcquisitionYes
Ext Interrupts16
USB Transceiver1
SD / eMMC0
Graphic LCDNo
Video DecoderNo
Camera InterfaceNo
ADC Resolution (bits)12
Resistive Touch ScreenNo
DAC Channels1
DAC Resolution (bits)10
Self Program MemoryYES
External Bus Interface0
DRAM MemoryNo
NAND InterfaceNo
Debug InterfaceSWD
Diff. ADC Inputs10
Output Compare Channels18
Input Capture Channels8

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