stm32w108hb is a high-performance, 802.15.4 wireless system-on-chip produced by stmicroelectronics. the chip integrates 32-bit arm® cortex™-m3 processor, 2.4 ghz ieee 802.15.4 transceiver and lower mac, 128-kbyte flash, 8-kbyte ram memory, aes128 encryption accelerator, flexible adc, spi/uart/twi serial communications and general-purpose timers, and 24 highly configurable gpios with schmitt trigger inputs.