The EM351/EM357x/EM358x/EM359x are fully integrated Zibgee / IEEE 802.15.4 system-on-chips. Each with integrated 2.4 GHz, IEEE 802.15.4-2003-compliant transceiver, 32-bit ARM® Cortex-M3 microprocessor, flash and RAM memory, and a range of peripherals. The