A 15-nW per Sensor Interference-Immune Readout IC for Capacitive Touch Sensors

Journal article (2019)

Authors

Said Hussaini Student
H. Jiang Electronic Instrumentation - EEMCS
Paul Walsh Cypress Semiconductor, Cork
Dermot MacSweeney Cypress Semiconductor, Cork
K.A.A. Makinwa Microelectronics
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: © 2019 Said Hussaini, H. Jiang, Paul Walsh, Dermot MacSweeney, K.A.A. Makinwa
DOI: https://doi.org/10.1109/JSSC.2019.2907041
Asynchronous tracking logic Capacitance-to-digital-converter (CDC) Self-capacitance sensor Stand-alone touch sensor Ultra-low-power oscillator
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Published Date

2019

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This paper presents a readout IC that uses an asynchronous capacitance-to-digital-converter (CDC) to digitize the capacitance of a touch sensor. A power-efficient tracking algorithm ensures that the CDC consumes negligible power consumption in the absence of touch events. To facilitate its use in wake-on-touch applications, the CDC can be periodically triggered by a co-integrated ultra-low-power relaxation oscillator. At a 38-Hz scan rate, the readout IC consumes 15 nW per touch sensor, which is the lowest reported to date.

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