Multi-stage stylus detection

摘要

A system comprises a processing device and a capacitive sense array that includes a plurality of electrodes. The system receives a first signal from a first scan of electrodes in a capacitive sense array. The system processes the first signal using a first set of sequences to detect a stylus. The system receives a second scan from a second scan of electrodes in a capacitive sense array. The system processes the second signal using a second set of sequences to detect the stylus.

主权项

1. An apparatus comprising:
a sense array comprising a plurality of electrodes; an analog-to-digital converter (ADC) coupled to the sense array and configured to receive signals from the sense array in a first mode and in a second mode; and a processing device coupled to the sense array and to the ADC, the processing device configured at least to: set the ADC to a first sampling frequency in the first mode; and set the ADC to a second sampling frequency in the second mode.