Patent ID: 11863174
Assignee: PIXART IMAGING INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A detection chip, configured to be electrically coupled to an electrode, the detection chip comprising:
a charging circuit, configured to sequentially provide a first charging current and a second charging current, smaller than the first charging current, within a charging interval;
a discharging circuit, configured to sequentially provide a first discharging current and a second discharging current, smaller than the first discharging current, within a discharging interval; and
a processor, configured to
exclude time intervals associated with the first charging current and the first discharging current from a summation of the charging interval and the discharging interval to determine a time of interest, and
output a control signal by comparing the time of interest with a variation threshold.