The Microchip ATSAMR34J18 ultra-low power microcontroller uses the 32-bit ARM® Cortex®-M0+ processor and offers 256KB of Flash and 40KB of SRAM (8KB battery backed) in a compact 6 x 6 mm BGA package. With ultra-low power sleep currents as low as 790nA. The highly configurable peripherals include up to 5 SERCOMs (configurable as I2C/SPI /UART/LIN interfaces) with one in the low power domain, 8 12-bit ADC channels, 2 analog comparators and custom configurable logic modules. The transceiver supports LoRa, FSK, MSK and GSK modulation and delivers up to 20 dBm TX power with an RX sensitivity down to -148 dBm.

256KB Flash and 40 KB RAM accommodates application code and stack
Most cost and size effective solution, eliminating need for external MCU
Fully supported 862 to 1020 MHz frequency coverage
Down to -148 dBm Receive Sensitivity
Up to 20 dBm maximum transmit power
Low RX current of 17mA (typical)
Temperature range between -40°C to 85°C
64 Lead Ball Grid Array (BGA) package