•
If the finger is lifted from the surface, but a Touch state is still reported, the Release Threshold has
to be increased.
3.2.7.1
Approach Speed
The Minimum Approach Speed parameter adjusts the minimum approach speed required to detect a
touch event.
•
If touch is only detected if the finger approaches quickly, decrease Minimum Approach Speed.
However, when Minimum Approach Speed is too low, false alarms may occur when a finger is
approaching slowly, but not touching.
•
If Minimum Approach Speed is set to 0, the touch detection is not dependent on speed and it is
only configured by the thresholds on the SD level.
3.2.7.2
Tap Settings
•
Max. Tap Time
A Single Tap is detected only when the time between a touch press and the consecutive release is
smaller than the Max. Tap Time. Higher values allow taps with longer duration.
The time can be adjusted using the corresponding slider, with values between 0 and 1s.
•
Max. Double Tap Interval
The Double Tap is detected when the time between the release of a Single Tap and the consecutive
touch press is smaller than the Max. Double Tap Interval. Higher values allow longer intervals
between taps. The time can be adjusted using the corresponding slider 1, that can take values
between 0 and 1s.
•
Air Taps
If Air Taps are required, set the threshold low, depending on the height of the tap required and set
the approach speed to a low value or even 0.
3.2.8
Position Tracking
3.2.8.1
Electrode Dimensions
To start position parameterization, the user needs to input the electrode dimensions. The figure below
shows how to measure the electrode dimensions. Adjust the electrode X and Y distances by using the
respective slider.
Figure 3-10. Electrode Dimensions
SOUTH
EAST
WEST
NORTH
Electrode X distance
Electrode
Y distance
Sensing Space
MGC3140
Tuning
©
2018 Microchip Technology Inc.
User Guide
DS40002055A-page 16