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Channel 1 will be forming a SNS-SNSK pair as A3A4
Channel 2 will be forming a SNS-SNSK pair as A5A7.
The channel numbering is not dependent on the pin numbering.
5.6.6.1.2
Channel numbering when using QMatrix acquisition method
Figure 5-9 illustrates a QMatrix capacitive sensing solution which uses 4 X lines and 4 Y lines
thereby providing a 16 channel solution.
Note:
1. All channels selected for a specific rotor or slider should be on a single Y line.
2. The choice of ports for X and Y lines is left to the user to based on the availability of the
pins available in the particular device selected. Please refer to the section 5.8.2 for more
details configuring of touch sensing pins for QMatrix.
The channel numbering for QMatrix configuration follows a matrix pattern with the channel
numbers starting from 0 for the matrix intersection (X0Y0 ) and increasing along the X lines for a
given Y line ( Channel 1 is X1Y0 ) and then moving on to the row number 0 for the next column.
Table 1 lists the possible channel numbers and the associated X/Y line associations for the
different configurations of QMatrix library variants.
A group of channels form a sensor and the sensor numbering is determined by the order in which
the user defines the association of channels and uses them as a sensor.
The channel numbering is fixed for a specific library variant based on the number of X and Y lines
used whereas the sensor numbering is determined at the time of usage based on the order in
which the user defines the association of the channels to create a sensor.
X0
X1
Ch 0
Ch 1
Ch 4
Ch 5
Ch 8
Ch 9
Ch 12
Ch 13
ROTOR/SLIDER
X2
X3
Ch 2
Ch 3
Ch 6
Ch 7
Ch 10
Ch 11
Ch 14
Ch 15
KEY
Y0
Y1
Y2
Y3
QMatrix also supports such rotor/slider configuration.
QMatrix Channels
The channels selected for a Rotor / Slider MUST be on a single YA/YB line.
Figure 5-9: Channel Numbering for QMatrix acquisition method libraries
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