Direct Sensor-to-microcontroller Interface Circuits: Design and Characterisation
This book describes the design and characterisation of interface circuits for the dirct connection of sensors with a time-based output signal to a microcontroller.
The topics analysed are (a) the performance of microcontrollers in timing signals, (b) the susceptibility of IC quasi-digital sensors to supply voltage changes and (c) the performanceof direct modulating sensor-to-microcontroller interfaces based on measuring the charging/discharging time of na RC circuit.
The authors analyse the features and limitations of these interface circuits, and offer design rules and guidelines for improving their performance.
This book interestes designers of microcontrollers and IC sensors, which can apply the theoretical models developed herein to predict and reduce the effects of power supply interference. It also interests electronic circuit designers, which can apply the test circuits, measurement methods and design rules to their own designs. Finally, the book being the result of doctoral thesis, it may inspire other researchers to engage in gaining further insight in some of the topics considered, and help them in learning a systematic approach to hypothesis formulation and testing
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Timeinterval measurements using microcontrollers
Power supply interference effects on quasidigital
Direct modulating sensortomicrocontroller interfaces
amplitude analogue bias error calculated calibration resistor capacitive sensors commercial quasi-digital sensors CPU activity data sheets decoupling capacitor depends digital numbers discharging time measurement effects of power equal event of power external interrupt pin external ST buffer frequency response hence histogram IEEE input signal instruction cycles interference superimposed interfering frequency internal threshold voltage meas measurand microcontroller supply voltage Microcontroller-based interface modulating sensor Node noise sources noise/interference operational amplifiers oscillator performance period measurements PIC microcontroller power supply interference PSRR quantisation quantisation error RB0/INT RC circuit relative error relative systematic error resistive sensors resistor resolution Schmitt trigger Section sensor chip sensor output signal shown in Figure sine wave sine wave interference Single-point calibration technique slew rate standard deviation stray capacitances supply interference effects tested theoretical three-signal measurement method threshold voltage time-interval measurements time-to-digital conversion trigger noise trigger point uncertainty sources universal counters urement voltage comparison yields