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

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

Hussaini, Said (Student TU Delft)
Jiang, H. (TU Delft Electronic Instrumentation)
Walsh, Paul (Cypress Semiconductor, Cork)
MacSweeney, Dermot (Cypress Semiconductor, Cork)
Makinwa, K.A.A. (TU Delft Microelectronics)

Microelectronics

2018

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.

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

http://resolver.tudelft.nl/uuid:1b1cecda-8447-425a-8b4e-e976076c7ce1

https://doi.org/10.1109/ESSCIRC.2018.8494283

IEEE, Piscataway, NJ

2022-03-30

978-153865404-0

ESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference

ESSCIRC 2018, 2018-09-03 → 2018-09-06, Dresden, Germany

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-care Otherwise 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.

Institutional Repository

conference paper

© 2018 Said Hussaini, H. Jiang, Paul Walsh, Dermot MacSweeney, K.A.A. Makinwa