Low power capacitive sensor button

A method comprising:

• operating a sensing block in a first mode and a second mode during a sensor monitoring period;
• receiving a plurality of trigger signals;
• responsive to each trigger signal, of the plurality of trigger signals, transitioning the sensing block from operating in the first mode to operating in the second mode, said transitioning comprising turning on power to one or more portions of the sensing block;
• operating the sensing block in the second mode, said operating comprising performing a plurality of sensor scans during a plurality of sensing periods of the monitoring period;
• based on performing a first scan during a first sensing period, of the plurality of sensing periods, transitioning from operating the sensing block in the second mode to operating the sensing block in the first mode, said transitioning comprising turning off the power to the one or more portions of the sensing block;
• and
• based on performing a second scan during a second sensing period, of the plurality of sensing periods, transitioning a processing module from operating in a first processing mode to operating in a second processing mode.

A capacitive sensing module comprising:

• sensing circuitry configured to couple to one or more capacitive sensors, the sensing circuitry configured to operate in a first mode and a second mode during a sensor monitoring period, wherein the operation of the sensing circuitry in the first mode comprises a plurality of non-sensing periods of the sensor monitoring period and the operation of the sensing circuitry in the second mode comprises a plurality of sensor scans during a plurality of sensing periods of the sensor monitoring period;
• and
• first logic coupled to the sensing circuitry, the first logic configured to receive a plurality of trigger signals and responsive to each trigger signal transition the sensing circuitry from operation in the first mode to operation in the second mode, the transition comprising turning on power to the sensing circuitry, wherein responsive to a first sensor scan of a first sensing period, the first logic is configured to transition the sensing circuitry from operation in the second mode to operation in the first mode, the transition comprising turning off the power to the sensing circuitry;
• and
• second logic coupled to the sensing circuitry, wherein responsive to a second scan during a second sensing period the second logic is configured to transition a processing module from operation in a first processing mode to operation in a second processing mode.