SAM L21 Xplained Pro Evaluation Kit

The Atmel® | SMART SAM L21 Xplained Pro evaluation kit is ideal for evaluating and prototyping with the ultra low power Atmel SAM L21 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 ATSAML21J18B 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 ATSAML21J18B 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 SAML21-XPRO-B board

  • ATSAML21J18B microcontroller
  • One mechanical reset button
  • One mechanical user pushbutton
  • One yellow user LED
  • Backup battery
  • 32.768kHz crystal
  • USB interface, device and host mode
  • Three Xplained Pro extension headers
  • One QTouch® button
  • Embedded Debugger
    • Auto-ID for board identification in Atmel Studio
    • One yellow status LED
    • One green board power LED
    • Symbolic debug of complex data types including scope information
    • Programming and debugging, including power measurement
    • Data Gateway Interface: SPI, I²C, 4 GPIOs
    • Virtual COM port (CDC)
  • USB powered


Please note that the SAML21-XPRO does not yet support drag'n'drop programming. Use the Free Atmel Studio IDE to program & debug the board.


Key parameters for ATSAML21J18B

Flash (Kbytes)256 Kbytes
USB Transceiver1
Ext Interrupts16
Max I/O Pins51
Hardware QTouch AcquisitionYes
Max. Operating Freq. (MHz)48 MHz
Pin Count64
USB SpeedFull Speed
Quadrature Decoder Channels0
TWI (I2C)6
USB InterfaceHost, Device
ADC Channels20
ADC Speed (ksps)1000
ADC Resolution (bits)12
Camera InterfaceNo
Video DecoderNo
Graphic LCDNo
SD / eMMC0
DAC Resolution (bits)12
DAC Channels2
Resistive Touch ScreenNo
Analog Comparators2
SRAM (Kbytes)32
Temp. SensorYes
DRAM MemoryNo
External Bus Interface0
EEPROM (Bytes)0
Temp. Range (deg C)-40 to 85
Debug InterfaceSWD
NAND InterfaceNo
Operating Voltage (Vcc)1.62 to 3.63
MPU / MMUno / no
Output Compare Channels24
PWM Channels24
Input Capture Channels8
Calibrated RC OscillatorYes
RTCRTC/Counter, Clock+Cal
32kHz RTCYes
Self Program Memory8
Crypto EngineAES/TRNG
# of Touch Channels192
ADC Gain StageopAmps
Diff. ADC Inputs8

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