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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

646
A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
646

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Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation
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Reducing Measurement Time in Direct Interface Circuits for Resistive Sensor Readout.

José A Hidalgo-López1, José A Sánchez-Durán1,2, Óscar Oballe-Peinado1,2

  • 1Departamento de Electrónica, Universidad de Málaga, Andalucía Tech, Campus de Teatinos, 29071 Málaga, Spain.

Sensors (Basel, Switzerland)
|May 7, 2020
PubMed
Summary
This summary is machine-generated.

Direct Interface Circuits (DICs) accelerate resistive sensor readings by reducing conversion times over 20-fold. This innovation enhances efficiency in resistance-to-time-to-digital conversion without compromising accuracy.

Keywords:
calibration methodsdirect interface circuitserror analysisinterface sensorresistive sensortime-based measurement

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Embedded Systems

Background:

  • Direct Interface Circuits (DICs) enable resistive sensor readings via resistance-to-time-to-digital conversion, eliminating the need for analog-to-digital converters.
  • The primary advantage of DICs is design simplicity, requiring only basic passive components like resistors and a capacitor.
  • A significant drawback of conventional DICs is the prolonged conversion time, dictated by multiple capacitor charge and discharge cycles.

Purpose of the Study:

  • To present a modified estimation method for resistive DICs that significantly reduces conversion time.
  • To improve the efficiency of the widely used Two-Point Calibration Method (TPCM) within DICs.

Main Methods:

  • A novel modification to the Two-Point Calibration Method (TPCM) was implemented.
  • This involved incorporating a single additional programmable digital device pin into the DIC.
  • An extra measurement was added during each discharge cycle without increasing the overall cycle time.

Main Results:

  • The modified method achieved a reduction in charge times by over 20-fold, reaching approximately 2 µs.
  • This substantial time reduction was accomplished with a minimal increase in relative errors, ranging from 0.2% to 0.3% across most tested resistance values.

Conclusions:

  • The enhanced TPCM offers a significant speed improvement for resistive DICs.
  • This method provides a practical solution for applications requiring faster sensor readings.
  • The minimal impact on accuracy makes this modification highly viable for widespread adoption.