Driven shield control
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United States of America Patent
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Jul 17, 2018
Grant Date -
Oct 26, 2017
app pub date -
Apr 25, 2016
filing date -
Apr 25, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
In an embodiment, a circuit comprises: an analog driver operable to drive a sensor voltage on a capacitive sensor; a digital driver; a shield drive control coupled to the analog driver and the digital driver, the shield drive control operable to: during a one or more phases of a capacitive measurement of the capacitive sensor, disable the analog driver and enable the digital driver to drive a driven shield; and during one or more other phases of a capacitive measurement of the capacitive sensor, disable the digital driver and enable the analog driver to drive the driven shield with a driven shield voltage that replicates the sensor voltage.
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