Capacitive sensor supporting multiple touch switches using a resistor string

Title
Capacitive sensor supporting multiple touch switches using a resistor string
Author(s)
성광수
Keywords
INTERFACE; MODULATION; CIRCUIT
Issue Date
201508
Publisher
TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY
Citation
TURKISH JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES, v.23, no.5, pp.1326 - 1337
Abstract
In a low-cost integrated circuit (IC) chip, the packaging cost is a considerable portion of the total manufacturing cost of the chip. As the packaging cost is directly related to the total number of I/O pins, it is highly desirable to minimize the number of I/O pins while maintaining the same functionality. We propose a capacitive sensor that supports multiple touch switches with only two IC pins. The electrode plates of the touch switches are placed at the ends of a resistor string and between every two adjacent resistors in the resistor string. The proposed method measures rise times at each side of the resistor string while driving the opposite side. The capacitive sensor can recognize an electrode plate contacted by a finger using the two rise times and the proposed rise time model. Experimental results with four touch plates show that the proposed capacitive sensor gives 181 fF resolution and can handle four touch switches.
URI
http://hdl.handle.net/YU.REPOSITORY/31313http://dx.doi.org/10.3906/elk-1304-149
ISSN
1300-0632
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공과대학 > 전자공학과 > Articles
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