Circuit and method for detecting working and resting states for optical mouse
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United States of America Patent
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Jan 9, 2018
Grant Date -
Sep 28, 2017
app pub date -
Mar 22, 2016
filing date -
Mar 22, 2016
priority date (Note) -
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Abstract
Disclosed is a circuit for detecting working and resting states for an optical mouse. During each frame capture, a counting unit of the digital logic circuit outputs a first counting signal to turn on a switching transistor, such that the voltage of the pixel capacitor varies from its predetermined voltage, and the counting unit starts to count. The automatic gain control module outputs a second counting signal as the voltage of the pixel capacitor varies one threshold from the predetermined voltage, such that the counting unit stops counting and outputs a counting value. A computing unit computes a difference between the counting value and a reference counting value. The optical mouse is in a resting state if the difference is equal to or smaller than a threshold difference, and otherwise the optical mouse is in a working state.
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