A 15nW per Button Noise-Immune Readout IC for Capacitive Touch Sensor

Said Hussaini, Hui Jiang, Paul Walsh, Dermot MacSweeney, Kofi A.A. Makinwa

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

1 Citation (Scopus)


This paper presents a readout IC that uses an asynchronous charge-redistribution-based capacitance-to-digital-converter (CDC) to digitize the capacitance of a touch sensor. Thanks to the power efficient tracking algorithm, the CDC consumes negligible power consumption in the absence of touch events. To facilitate stand-alone or 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.

Original languageEnglish
Title of host publicationESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference
Place of PublicationPiscataway, NJ
Number of pages4
ISBN (Electronic)978-153865404-0
Publication statusPublished - 2018
EventESSCIRC 2018: 44th IEEE European Solid State Circuits Conference - Dresden, Germany
Duration: 3 Sep 20186 Sep 2018
Conference number: 44


ConferenceESSCIRC 2018


  • Asynchronous tracking logic
  • CDC
  • Stand-alone touch sensor
  • Ultra-low power oscillator

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