Interference detection using frequency modulation

An integrated circuit, comprising:

• capacitive sensing means for:
• operating, during a first time period, a plurality of sensor electrodes in a capacitive sensing mode to perform capacitive sensing using a plurality of sensing bursts,
• operating, during a second time period, the plurality of sensor electrodes in an interference detection mode to detect interfering signals using at least first and second interference bursts, wherein a frequency the first interference burst is different than a frequency of the second interference burst, and
• wherein the first time period and the second time period are non-contiguous time periods separated by an intermediate time period such that a phase of the plurality of sensing bursts is offset from a phase of at least one of the first and second interference bursts.

A method, comprising:

• operating, during a first time period, a plurality of sensor electrodes in a capacitive sensing mode to perform capacitive sensing using a plurality of sensing bursts;
• and
• operating, during a second time period, the plurality of sensor electrodes in an interference detection mode to detect interfering signals using at least first and second interference bursts, wherein a frequency the first interference burst is different than a frequency of the second interference burst,
• wherein the first time period and the second time period are non-contiguous time periods separated by an intermediate time period such that a phase of the plurality of sensing bursts is offset from a phase of at least one of the first and second interference bursts.