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If QTLIB_BURST_AGAIN = 0, multiple measurements are not needed and the user can execute
the host application code. Apart from QTLIB_BURST_AGAIN, various flags are provided to the
user to perform the multiple measurements based on the need of the host application to act to
specific situation. Description of the these flags can be found in the section5.6.5.6
Note: To maintain robustness and timing of the touch sensing measurement, it is recommended
that the user calls the qt_measure_sensors() immediately if the flag QT_BURST_AGAIN=1.
However, the user is allowed to run time- critical section (not more than few instructions) of the
host application comprising on the touch sensing timing.
5.5.3 Guard Channel
Guard channel in Qtouch Acquisition Method allows one key to be configured as a guard channel
to help prevent false detection. Guard channel keys should be more sensitive than the other keys
(physically bigger or larger Cs).To enable key as guard channel, the designated key is connected
to a sensor pad which detects the presence of touch and overrides any output from the other
keys using the AKS feature.
The key can be configured to have a guard channel function by adjusting a number of
independent settings. The Guard channel is designed so that it is likely to be activated unless a
key is accurately touched.
The guard channel sensor must be set up so that it is slightly more sensitive than the keys that it
surrounds. The exact amount of increase depends on the application and is best determined by
experimentation.
There are three methods of increasing the sensor sensitivity that can be used in combination:
1. Increasing the size of the sensor.
2. Increasing the value of the Sample Capacitor (Cs).
3. Adjust the detection threshold for the sensor.
The sensor size and capacitor values should be altered to establish the base sensitivity for the
sensor. Once these values have been established, the detection threshold can be used to fine
tune the sensor.
MCU with
SNS and
SNSK
Pins
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