ZigBee radio chip enables WiFi coexistence schemes - Embedded.com

ZigBee radio chip enables WiFi coexistence schemes


GreenPeak Technologies has launched its GP501 ZigBee transceivers. The new radio chips feature a scheme that allows Wi-Fi, Bluetooth, and ZigBee chips to work side by side in the same device. The GP501's 32-pin 5×5 mm2 footprint allows integration into even the smallest product form-factors.

ZigBee shares the 2.4 GHz frequency band with other Wi-Fi equipment. The GP501 has a coexistence interface to allow optimized and co-located ZigBee/Wi-Fi radios to work in the same device, successfully avoiding RF interference when operating simultaneously. This coexistence interface enables arbitration over the shared radio frequency medium to prevent contention, signal degradation and data loss.

Deep Packet Inspection (DPI) enables advanced packet management, allowing the host processor to go into a deep-sleep mode to conserve power. While most other ZigBee transceiver chips include only superficial inspection of the MAC and PHY headers, the GP501 looks beyond these layers and executes a Deep Packet Inspection, allowing the chip to decide if the packet has to be passed on to the higher layer application or can be ignored. The DPI engine is also security aware, blocking unauthorized packets without involving the host processor and ensuring that the system does not waste energy analyzing non-compliant packets. The DPI feature can be used for Wake-on-LAN functionality, where ultra-low power ZigBee is used to wake up the main processor from its sleep mode to enable Wi-Fi networking.

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