Features
▪ SAMD21G18A Processor
▪ ARM Cortex M0+ at up to 48 MHz
▪ 256KB Flash
▪ 32KB SRAM
▪ Power On Reset POR and Brown Out Detection
(BOD)
▪ Peripherals
▪ 12 channel DMA
▪ 12 channel event system
▪ 5x 16 bit Timer/Counter
▪ 3x 24 bit timer/counter with extended
functions
▪ 32 bit RTC
▪ Watchdog Timer
▪ CRC-32 generator
▪ Full speed Host/Device USB with 8 end
points
▪ 6x SERCOM (USART, I 2 C, SPI, LIN)
▪ Two channel I 2 S
▪ 12 bit 350ksps ADC (up to 16 bit with
oversampling)
▪ 10 bit 350ksps DAC
▪ External Interrupt Controller (up to 16 lines)
▪ Murata CMWX1ZZABZ LORA Module
▪ STMicro STM32L0 series ARM Cortex M0+ 32 bit
MCU
▪ 192Kbytes Flash
▪ +20dBm RF TX Output Power
▪ Semtech SX1276 Radio
▪ W25Q16 SPI Flash memory
▪ 16Mbit SPI Flash
▪ 4mA active current, <1μA Power-down (typ.)
▪ More than 100,000 erase/program cycles
▪ More than 20-year data retention

▪ ATECC508 Crypto Chip
▪ Cryptographic co-processor with secure
hardware based key storage
▪ Protected storage for up to 16 keys, certificates
or data
▪ ECDH: FIPS SP800-56A Elliptic Curve
Diffie-Hellman
▪ ECDSA: FIPS186-3 Elliptic Curve Digital Signature
Algorithm
▪ NIST standard P256 elliptic curve support
▪ SHA-256 & HMAC hash including off-chip context
save/restore
▪ BQ24125L I2C Controlled USB/Adapter Charger
▪ 92% Charge Efficiency at 2 A, 90% at 4 A
▪ Autonomous Battery Charging
▪ 2.5-A Fast Charging