Analysis of power-supply interference effects on direct sensor-to-microcontroller interfaces

被引：47

作者：

Reverter, Ferran ^{[1
]}

Gasulla, Manel ^{[1
]}

Pallas-Areny, Ramon ^{[1
]}

机构：

[1] Tech Univ Catalonia, Instrumentat Sensors & Interfaces Grp, Castelldefels Sch Technol, EPSC, Barcelona 08860, Spain

来源：

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 2007年 / 56卷 / 01期

关键词：

capacitive sensor; interference rejection; microcontroller; resistive sensor; sensor interface;

D O I：

10.1109/TIM.2006.887401

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper analyzes the effects of power-supply interference on direct sensor-to-microcontroller interfaces based on measuring the charging/discharging time of an RC circuit that includes the sensor. Power-supply interference becomes a source of trigger noise that affects the measurement of the charging/discharging time and, hence, the measurement of the sensor resistance or capacitance. The measurement uncertainty increases proportionally to the amplitude of the interference and depends on its frequency. Such interference effects are smaller when measuring the discharging time and can be further reduced by placing an additional resistor in the interface circuit. Experimental data obtained from a PIC microcontroller agree with the theoretical predictions.

引用

页码：171 / 177

页数：7

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