Datasheet

TECH SPECS
Microcontroller SAMD21 Cortex-M0+ 32bit low power ARM MCU
Board Power Supply (USB/VIN) 5V
Supported Battery(*) Li-Po single cell, 3.7V, 700mAh minimum
DC Current for 3.3V Pin 600mA
DC Current for 5V Pin 600mA
Circuit Operating Voltage 3.3V
Digital I/O Pins 22
PWM Pins 12 (0, 1, 2, 3, 4, 5, 6, 7, 8, 10, A3 - or 18 -, A4 -or 19)
UART 1
SPI 1
I2C 1
Analog Input Pins 7 (ADC 8/10/12 bit)
Analog Output Pins 1 (DAC 10 bit)
External Interrupts 8 (0, 1, 4, 5, 6, 7, 8, A1 -or 16-, A2 - or 17)
DC Current per I/O Pin 7 mA
Flash Memory 256 KB
Flash Memory for Bootloader 8 KB
SRAM 32 KB
EEPROM no
Clock Speed 32.768 kHz (RTC), 48 MHz
LED_BUILTIN 32
Full-Speed USB Device and embedded Host