Capacitive input device interference detection and operation

摘要

A processing system for a capacitive input device comprises sensor circuitry and control logic. The sensor circuitry is configured to be communicatively coupled with sensor electrodes of the capacitive input device. The control logic is configured to operate the capacitive input device in a first mode comprising interference sensing at a first level and input object sensing. The control logic is also configured to operate the capacitive input device in a second mode instead of in the first mode in response to: interference measured in the first mode meeting an interference condition; and a determination that input is in a sensing region of the capacitive input device. While operating in the second mode, interference sensing with the capacitive input device is either not performed or else is performed at a second level that is lower in fidelity than the first level.

主权项

1. A processing system for a capacitive input device, said processing system comprising:
sensor circuitry configured to be communicatively coupled with sensor electrodes of said capacitive input device; and a processor configured to:
operate said capacitive input device in a first mode comprising transmitting with a subset of said sensor electrodes to perform capacitive sensing during a portion of a capacitive sensing frame that is dedicated to input object sensing and during another portion of said capacitive sensing frame to perform interference sensing at a first level with said sensor electrodes;cease said first mode of operation and operate said capacitive input device in a second mode instead of in said first mode in response to:
interference measured in said first mode meeting an interference condition indicative of being within acceptable bounds for input sensing; anda determination that input is in a sensing region of said capacitive input device, wherein, while in said second mode input object sensing is performed in said capacitive sensing frame, but interference sensing is not performed in said capacitive sensing frame; andreturn from said second mode of operation to said first mode of operation in response to experiencing signal corruption while performing input object sensing during said second mode of operation.