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Setting
Negative Drift
Positive Drift
Variable name
qt_neg_drift_rate
qt_pos_drift_rate
Data Type
uint8_t
uint8_t
Unit
200 ms
200 ms
Min
1
1
Max
127
127
Typical
20 (4s)
5 (1s)
5.3.6 Positive Recalibration Delay
If any key is found to have a significant drop in signal delta, (on the negative side), it is deemed to
be an error condition. If this condition persists for more than the positive recalibration delay, i.e.,
qt_pos_recal_delay period, then an automatic recalibration is carried out.
A counter is incremented each time the sensor delta is equal to the positive recalibration
threshold and stayed there for a specific number of acquisitions. When this counter reaches a
preset limit (the PRD value) the sensor is finally recalibrated. If on any acquisition the delta is
seen to be greater than the positive recalibration threshold level, the counter is cleared and the
positive drifting is performed.
For example, if the PRD value is 10, then the delta has to drop below the recalibration threshold
and stay there for 10 acquisitions in succession without going below the threshold level, before
the sensor is declared to be recalibrated.
Setting
Positive
Variable name
qt_pos_recal_delay
Data Type
uint8_t
Unit
cycles
Min
1
Max
255
Typical
3
Recalibration
Delay
5.4 Sensor specific settings
Apart from global settings as mentioned in the section above, touch sensing using QTouch library
could also be fine tuned by more number of configurable settings.
This section explains the settings that are specific to each sensor. For example, sensor 0 can
have a detect threshold (one of the sensor specific setting) that is different from sensor 1.
5.4.1 Detect threshold
A sensor’s negative (detect) threshold defines how much its signal must drop below its reference
level to qualify as a potential touch detect. The final detection confirmation must however satisfy
the Detect Integrator (DI) limit. Larger threshold values desensitize sensors since the signal must
change more (i.e. requires larger touch) in order to exceed the threshold level. Conversely, lower
threshold levels make sensors more sensitive.
Threshold setting depends on the amount of signal swing that occurs when a sensor is touched.
Thicker front panels or smaller electrodes usually have smaller signal swing on touch, thus
require lower threshold levels.
Setting
Threshold
Variable name
threshold
Data Type
uint8_t
Unit
counts
Min
3
Max
255
Typical
10 – 20
5.4.2 Hysteresis
This setting is sensor detection hysteresis value. It is expressed as a percentage of the sensor
detection threshold setting. Once a sensor goes into detect its threshold level is reduced (by the
18
8207L-AT42-05/12
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