Patent ID: 11907440
Assignee: PIXART IMAGING INC.
Field: Digital communication (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 7:
8. A navigation sensor circuit to be externally coupled to a microcontroller, comprising:
an image sensor, for operating and capturing images to generate and output displacement data based on a sensor frame rate;
a specific counter; and
a control circuit, coupled to the image sensor and the specific counter, for:
monitoring at least one polling request signal sent from the microcontroller during a variable time interval;
calculating at least one polling rate of the microcontroller according to the at least one polling request signal; and
dynamically adjusting the sensor frame rate according the at least one polling rate;

wherein a time length of the variable time interval is proportional to a programmable threshold, and the specific counter is started by the control circuit to count a number of signal receptions of the at least one polling request signal and is reset by the control circuit when a counting number of the specific counter is higher than the programmable threshold.