One of the most popular microcontrollers is ATSAMD21G18A (further - SAMD21). It is a powerful MCU with the Cortex M0+ architecture. Module BOKRA SAMD21 Lite is the world's smallest board with this MCU, designed in the mikroBUS format and having mikroBUS slot and I2C bus.


Frequency – 48 MHz. MCU flash memory - 256 kB, RAM - 32 kB. The microcontroller supports up to six serial interfaces (SERCOM), each of which can be configured as I2C, USART, SPI or LIN-slave. One USB 2.0 channel is also available. The microcontroller contains one 12-bit ADC (speed - up to 350 ksps) and 10-bit DAC (speed - up to 350 ksps).


Debug Interface - SWD. External connectors - I2C and mikroBUS.

Input power supply - 5V. The voltage regulator is Microchip's MIC5528, providing 500 mA output current. The module has a RESET button and three LEDs (power and two software-controlled).

The size of the BOKRA SAMD21 Lite module is 28.6 x 25.4 mm.


The ATSAMD21G18A microcontroller is widely used in the following areas:

  • Industrial Applications
  • Automotive
  • Remote I / O
  • Wireless controllers
  • Consumer devices
  • Household appliance
  • Keyboards and Human Interface screens


Easy create and product. All BOKRA SAMD21 Lite users can easy create compact application solutions and instantly overcome the barrier between prototype and factory production stage of their device.


  • Add SAMD21 MCU power to expansion modules with mikroBUS interface, Grove Systems peripherals and any I2C modules
  • Users will have the opportunity to apply any of more than 500 expansion modules with mikroBUS in their developments based on SAMD21
  • BOKRA SAMD21 Lite is compatible with Arduino IDE and Atmel Studio


Attention! The BOKRA SAMD21 Lite module is compatible with MikroElektronika Click® modules using 3.3V. Compatibility with 5V Click® modules is not guaranteed.



SAMD21 Lite



  • Facebook Social Icon
  • Twitter Social Icon