Features
 License-free 868/915 MHz frequency bands
 4 channels in EU frequency band (865.3 to 868.3 MHz)
 10 channels in US frequency band (906 to 924 MHz)
 BPSK or O-QPSK modulation selectable
 BPSK with 20kBps EU and 40kBps US
 ARM® Cortex™-M0+ 32-bit ultra-low-power microcontroller
 192kB flash and 20kB RAM
 6 Kbyte EEPROM
 5 UART interfaces
 1 SPI interface
 3 I2C interfaces
 10 pulse-width-modulation (PWM) outputs
 12-bit ADC with 10 input channels
 2 analog comparators
 31 general purpose I/O (GPIO) pins
 Network Stack
 UDP/IPv6 communication
 Mesh networking with hundreds of nodes
 Self-healing defective routes
 Over-the-Air update (OTAU) capable
 Network layer security
 Ultra-low power Stop Mode: < 1μA with full RAM retention
 Supply voltage: 1.8V to 3.3V
 -40°C to +85°C ambient operating temperature
 15.6 × 12 mm 43-LGA package