期刊
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
卷 65, 期 1, 页码 222-230出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2015.2479105
关键词
Energy consumption; microcontrollers (mu C); powerless sensor nodes; resistive sensors; radio-frequency identifier; sensor electronic interface
This paper analyzes the energy consumption of direct interface circuits where the data conversion of a resistive sensor is performed by a direct connection to a set of digital ports of a microcontroller (mu C). The causes of energy consumption as well as their relation to the measurement specifications in terms of uncertainty are analyzed. This analysis yields a trade-off between energy consumption and measurement uncertainty, which sets a design procedure focused on achieving the lowest energy consumption for a given uncertainty and a measuring range. Together with this analysis, a novel experimental setup is proposed that allows one to measure the mu C's timer quantization uncertainty. An application example is shown where the design procedure is applied. The experimental results fairly fit the theoretical analysis, yielding only 5 mu J to achieve nine effective number of bits (ENOB) in a measuring range from 1 to 1.38 k Omega. With the same ENOB, the energy is reduced to 1.9 mu J when the measurement limits are changed to 100 and 138 k Omega.
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