A manufacturer offers a 1.2 mW RF transceiver for a ZigBee device. Assume the sa

Question

A manufacturer offers a 1.2 mW RF transceiver for a ZigBee device. Assume the same power is used when transmitting and receiving, assuming 10% on-time. what size battery (in ampere/hour [Ah]) is required to operate for two months (30 days/mo)? Assume the maximum voltage that can be supported by this type of battery is 2.0 V. A manufacturer offers a 1.2 mW RF transceiver for a ZigBee device. Assume the same power is used when transmitting and receiving, assuming 10% on-time. what size battery (in ampere/hour [Ah]) is required to operate for two months (30 days/mo)? Assume the maximum voltage that can be supported by this type of battery is 2.0 V.

Explanation / Answer

Power used = 1.2 mW = 0.0012 W

10% on-time => 24*10%=2.4 hours/day

No. of days = 60

Total time of operation = 2.4*60=144

Using the relationship Power(P)= Voltage(V)*Current(I)

We get I = 1.2mW/2V = 0.6 mA = 0.0006 A

Size of battery required = 0.0006*144 = 0.0864 Ah = 86.4 mAh

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