Tiny freezer alarm uses <2 μA

Buccini, Mark E.
March 2006
Portable Design;Mar2006, Vol. 12 Issue 3, p25
The article discusses a tiny ultralow-power freezer alarm that can operate for more than 10 years using a low-pin-count microcontroller (MCU), a negative temperature coefficient (NTC) resistive sensor, and other components. It presents a detailed explanation on how the alarm works, how it extends battery life and saves power, the use of a flashing light emitting diode (LED) to indicate that the circuit is functioning, and why a 3-V CR2032 lithium coin-cell battery is used as the power source. It offers a calculation of the average current consumption for the freezer alarm circuit.


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