Low power multi-channel capacitive touch sensing unit using capacitor to time conversion method

This paper presents a multi-channel capacitive touch sensing unit for SoC applications. This unit includes a simple common processing unit and switch array to detect the touch sensing input by capacitive-time(C-T) conversion method. This touch sensor ASIC is designed based on the Capacitive-Time(C-T...

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Bibliographic Details
Main Authors: HyungGu Park, HongJin Kim, JooHyung Lee, Kang-Yoon Lee, Jin-Gyun Chung
Format: Conference Proceeding
Language:English
Subjects:
Arrays
Capacitance
Clocks
Oscillators
Sensors
Switches
Online Access:Request full text
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Summary:This paper presents a multi-channel capacitive touch sensing unit for SoC applications. This unit includes a simple common processing unit and switch array to detect the touch sensing input by capacitive-time(C-T) conversion method. This touch sensor ASIC is designed based on the Capacitive-Time(C-T) conversion method to have advantages of small current and chip area, and the minimum resolution of the unit is 41 fF per count with the built-in sensing oscillator, LDO regulator and I2C for no additional external components. This unit is implemented in 0.18 um CMOS process with dual supply voltage of 1.8 V and 3.3 V. The total power consumption of the unit is 60 uA and the area is 0.26 mm 2 .
ISSN:0271-4302
2158-1525
DOI:10.1109/ISCAS.2012.6271671