To optimize device power consumption and provide an optimum touch response, this code example implements two power
modes: Fast Scan mode and Slow Scan mode. When the user is interacting with the trackpad or button sensors, the device is
in the Fast Scan mode; when the sensors are inactive for a specific duration, the Slow Scan mode is used. In the Fast Scan
mode, all the trackpad sensors and button sensors are scanned at a refresh rate of 50 Hz and the I2C buffer is updated with
trackpad XY coordinates and button sensor status. This mode provides an optimum touch response but consumes higher
power when compared to the Slow Scan mode.
In the Slow Scan mode, the trackpad column sensors and two button sensors are ganged and scanned as a single sensor at a
refresh rate of 6 Hz. The Slow Scan mode consumes a lower average power but provides a slower touch response. The
watchdog timer is used to periodically wake up the device from the deep-sleep mode at a refresh rate of 50 Hz in the Fast
Scan mode and 6 Hz in the Slow Scan mode.
Try after disabling the sync'd read option in Tuner.
This option should be enabled when you are trying to monitor noise in rawcounts or if you want to change CapSense configuration parameters from tuner, but enabling this option increases the time that CPU spends in executing CapSense_RunTuner() API, which may be slowing down other functions.