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6.3.8.6
QTouch Group A/B method Disable and Re-enable Sensor for UC3L
The touch_qt_sensor_disable and touch_qt_sensor_reenable API can be used for Disabling and
Re-enabling of QTouch Group A and Group B Sensors. In order to Disable or re-enable a
sensor, the API must be called with the corresponding sensor_id. Disabling a Sensor disables
the measurement process on all the Touch Channels corresponding to Sensor.
When a QTouch Sensor is Disabled or re-enabled, it is mandatory to force Calibration on all
Sensors. The Calibration of all Sensors is done using the touch_qt_sensors_calibrate API.
6.3.9 Autonomous QTouch sensor operation for UC3L
6.3.9.1
Autonomous QTouch Sensor pin selection for UC3L
The Autonomous QTouch Sensor pin selection is similar to selection of pin for QTouch Group A/B
as indicated in Section 6.3.8.1 . Any one SNS-SNSK pair between SNS0-SNSK0 and SNS16-
SNSK16 can be chosen to function as an Autonomous QTouch sensor.
6.3.9.2
Autonomous QTouch sensor Schematic for UC3L
The Autonomous QTouch Sensor Sensor schematic is similar QTouch schematic as indicated in
Section 6.3.8.2 .
6.3.9.3
Autonomous QTouch method hardware resource requirement for UC3L
The clock for the CAT module, CLK_CAT, is generated by the Power Manager (PM). This clock is
turned on by default, and can be enabled and disabled in the PM. The user must ensure that
CLK_CAT is enabled before initializing the QTouch Library for Autonomous QTouch.
For the Autonomous QTouch Sensor, the complete detection algorithm is implemented within the
CAT module. This allows detection of proximity or touch without CPU intervention. Since the
Autonomous QTouch Sensor operates without software interaction, this Sensor can be used to
wakeup from sleep modes when activated. The Autonomous QTouch Status change interrupt
can be used to wakeup from any of the Sleep modes shown in the Table. The ‘Static’ Sleep
mode being the deepest possible Sleep mode from which a wake up from Sleep is possible using
the Autonomous QTouch.
Both an IN_TOUCH status change and OUT_OF_TOUCH status
change indication is available when using Autonomous QTouch.
The Autonomous QTouch method acquisition using the CAT module does not require any
Peripheral DMA channel for operation.
Sleep
Mode
Idle
Frozen
Standby
Stop
DeepStop
Static
CPU
Stop
Stop
Stop
Stop
Stop
Stop
HSB
Run
Stop
Stop
Stop
Stop
Stop
PBA,B
GCLK
Run
Run
Stop
Stop
Stop
Stop
Clock
sources
Run
Run
Run
Stop
Stop
Stop
Osc32
Run
Run
Run
Run
Run
Run
RCSYS
Run
Run
Run
Run
Run
Stop
BOD &
Bandgap
On
On
On
On
Off
Off
Voltage
Regulator
Full power
Full power
Full power
Low power
Low power
Low power
Table 12 Sleep mode support for Autonomous QTouch
130
8207L-AT42-05/12
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