CPC H03K 17/955 (2013.01) [G01R 27/2605 (2013.01); G01V 3/088 (2013.01); G06F 1/3231 (2013.01); G06F 3/011 (2013.01); H03K 17/962 (2013.01)] | 13 Claims |
1. A capacitance sensing device operation method, which is implemented by a signal processing circuit, a baseline processing circuit and a proximity sensing circuit; the capacitance sensing device operation method includes:
the signal processing circuit receiving a detecting data;
the baseline processing circuit calculating the difference between the detecting data and the detecting data received from the previous data frame;
the proximity sensing circuit implementing a comparing operation on the detecting data and a preserved baseline value to judge if a proximity event occurs or not;
wherein when the proximity event is occurred, the baseline processing circuit selects one of a plurality of proximity baseline updating procedures to update the baseline value based on the range in which the difference falls within;
when the proximity event is not occurred, the baseline processing circuit uses a non-proximity baseline value updating procedure to update the baseline value; and
the baseline processing circuit outputs the updated baseline value to the proximity sensing circuit.
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