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.
Original language | English |
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Article number | 8691537 |
Pages (from-to) | 1874-1882 |
Number of pages | 9 |
Journal | IEEE Journal of Solid-State Circuits |
Volume | 54 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2019 |
Bibliographical note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-careOtherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Keywords
- Asynchronous tracking logic
- capacitance-to-digital-converter (CDC)
- self-capacitance sensor
- stand-alone touch sensor
- ultra-low-power oscillator