公开(公告)号：US20220057540A1

公开(公告)日：2022-02-24

申请号：US17220288

申请日：2021-04-01

Applicant: SENSORTEK TECHNOLOGY CORP.

Inventor： WANG-AN LIN ,  CHUNG-JUNG WU ,  CHUN-LUN WANG

IPC: G01V3/08 ,  G01R27/26

Abstract: The present application relates to a method of operating a capacitance sensing device comprises: calculating a difference of a raw data compared to one of the raw data received in a previous data frame; and performing a comparison calculation based on the raw data and a stored baseline value to determine whether a proximity event has occurred. Under the proximity event, selects one of several baseline value update procedures based on the magnitude of the difference. Thus, the present application effectively avoids the problem of failure to update the baseline value when the object is close to the capacitance sensing device for a long period of time, which may lead to misjudgment of the capacitance sensing device.

公开(公告)号：US20220021387A1

公开(公告)日：2022-01-20

申请号：US17222271

申请日：2021-04-05

Applicant: SENSORTEK TECHNOLOGY CORP.

Inventor： WANG-AN LIN ,  MING-CHE YANG ,  MIN-CHUN TUAN ,  CHUNG-JUNG WU

IPC: H03K17/955 ,  H03K17/96

Abstract: The present application provides a proximity detection method and circuit thereof. The circuit includes a detection circuit, a baseline generating circuit, and a proximity sensing circuit. The proximity sensing circuit generates a proximity signal according to a detection data generated by the detection circuit, a baseline data generated by the baseline generating circuit and a proximity threshold, and judges whether the proximity signal is valid according to the detection data, a reference data, and a valid threshold. The validity of the proximity signal may be judged according to the reference data and the valid threshold and thus avoiding false judgement caused by the influences of the ambient factors.