A Low-power Generic Interface Circuit For
نویسندگان
چکیده
This paper presents a low-power generic interface circuit compatible with smart microsystems and capable of interfacing with a large variety of capacitive sensors. The interface chip is highly programmable, can communicate with an external microcontroller over a standard sensor bus, supports sensor selftest, and includes a temperature sensor. The circuit can interface with up to six external sensors and contains three programmable internal reference capacitors in the range of 0.15-8pF. The chip measures 3.2mm x 3.2mm in a standard 3μm single-metal doublepoly p-well process, dissipates less than 2.2mW from a single 5V supply and can resolve input capacitance variations of less than 1fF.
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تاریخ انتشار 2004