• JSSC2907041

    Accepted author manuscript, 956 KB, PDF document


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.

Original languageEnglish
Article number8691537
Pages (from-to)1874-1882
Number of pages9
JournalIEEE Journal of Solid-State Circuits
Issue number7
Publication statusPublished - 2019

    Research areas

  • Asynchronous tracking logic, capacitance-to-digital-converter (CDC), self-capacitance sensor, stand-alone touch sensor, ultra-low-power oscillator

ID: 55113453