Title :
Low power multi-channel capacitive touch sensing unit using capacitor to time conversion method
Author :
Park, HyungGu ; Kim, HongJin ; Lee, JooHyung ; Lee, Kang-Yoon ; Chung, Jin-Gyun
Author_Institution :
Sch. of Inf. & Commun. Eng., Sungkyunkwan Univ., Suwon, South Korea
Abstract :
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 mm2.
Keywords :
CMOS integrated circuits; application specific integrated circuits; capacitive sensors; integrated circuit design; low-power electronics; oscillators; sensor arrays; sensor fusion; system-on-chip; tactile sensors; C-T conversion method; CMOS processing; I2C; LDO regulator; SoC application; built-in sensing oscillator; capacitance 41 fF; capacitive-time conversion method; current 60 muA; low power multichannel capacitive touch sensing unit; power consumption; simple common processing unit; size 0.18 mum; supply voltage; switch array; touch sensor ASIC design; voltage 1.8 V; voltage 3.3 V; Arrays; Capacitance; Clocks; Oscillators; Sensors; Switches;
Conference_Titel :
Circuits and Systems (ISCAS), 2012 IEEE International Symposium on
Conference_Location :
Seoul
Print_ISBN :
978-1-4673-0218-0
DOI :
10.1109/ISCAS.2012.6271671
