Ambient luminosity level detection
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United States of America Patent
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Mar 27, 2018
Grant Date -
Sep 24, 2015
app pub date -
Jun 2, 2015
filing date -
Oct 25, 2012
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Abstract
The following steps are performed in connection with a photodiode circuit: a) resetting the photodiode circuit; b) determining when a photodiode voltage changes in response to illumination to reach a threshold; and c) updating a counter in response to the determination in step b). The steps a) to c) are repeated until an end of a measurement period is reached. The value of the counter at the end of the measurement period is then output to indicate an intensity of the illumination.
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