NEWS: ZigBee based transmission uses only 100 microjoules of harvested energy -

NEWS: ZigBee based transmission uses only 100 microjoules of harvested energy

Sheffield, UK – Jennic has demonstrated the capability of its JN5148 to perform multiple Zigbee packet transmissions from 100 μJ of energy per packet harvested from an electro-mechanical switch.

The company claims to be the first wireless microcontroller vendor to show ZigBee communications are possible with such low energy consumption. Jennic previously announced a series of energy harvesting technology demonstrators utilising thermal, vibrational, RF and solar energy harvesting techniques to power end devices in a wireless sensor network.

By employing a powered wireless backbone that contains permanently active Proxy Server Routers, energy constrained end devices can broadcast data when they are able, relying on the backbone to intercept the data messages. here the company is utilising the same approach but with even lower energy budgets.

According to Jimi Simpson, Jennic Product Marketing Manager, using the limited and instantaneous energy from an electro-mechanical switch harvester presents many design challenges.

By optimizing system initialization speeds and developing an enhanced communications infrastructure to support energy constrained sensor nodes, he said Jennic's engineers ensured sufficient energy was left over for a minimum of three packet transmissions to increase the probability of packet delivery to the receiver.

Such capalities will be useful to developers of applications in Home Automation (HA) and Commercial Building Automation (CBA) lighting solutions, where wireless, battery-less light switches will control the lighting within the building, minimizing the costs associated with cable installation and maintenance.

The company claims its Proxy Server Router approach is the real enabler for energy harvesting sensor nodes and is a key component of its Green Power architecture.

Jennic's JN5148 wireless microcontroller integrates a high-performance 32-bit RISC CPU core with mixed-signal peripherals and an IEEE802.15.4, 2.4 GHz transceiver.

The 98 dB link budget supports indoor communication over distances of up to 50 metres, whilst 128-bit AES encryption ensures a high level of security. It offers industry leading current consumption of just 15 mA when transmitting, 17.5 mA when receiving, and 200 nA in sleep.

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