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X and Yk pins wherein Resistive Drive can be enabled, saving on external components is
possible.
Section 6.3.1.1 provides detail on the number of Pin and Touch channels required for different
QMatrix method sensor. The hardware arrangement for Wheel or Slider must be such that all
Touch channels corresponding to the Wheel or Slider belong to the same Yk Line.
Also, Section 6.3.11 indicates the various Pin Configuration options for the QTouch Library that
can be used to specify a user defined configuration.
CAT Module Pin Name
CSA0
CSB0
CSA1
CSB1
CSA2
CSB2
CSA3
CSB3
CSA4
CSB4
CSA5
CSB5
CSA6
CSB6
CSA7
CSB7
CSA8
CSB8
CSA9
CSB9
CSA10
CSB10
CSA11
CSB11
CSA12
CSB12
CSA13
CSB13
CSA14
CSB14
CSA15
CSB15
CSA16
CSB16
QMatrix method Pin Name
X0
X1
Y0
YK0
X2
X3
Y1
YK1
X4
X5
Y2
YK2
X6
X7
Y3
YK3
X8
X9
Y4
YK4
X10
X11
Y5
YK5
X12
X13
Y6
YK6
X14
X15
Y7
YK7
X16
X17
Table 10 QMatrix Resistive drive pin option
(The rows marked with Grey indicate that Resistive Drive option is not available on that pin)
6.3.7.2
QMatrix method Schematic for UC3L
6.3.7.2.1
Internal Discharge mode
The CAT module provides an internal discharge arrangement for QMatrix method. When this
arrangement is used along with the Resistive drive capability, minimal external component is
required as shown in the case A of Figure 27. When the Resistive drive is option is not enabled,
it is recommended to use 1kOhm resistors on X and Yk Lines external to the UC3L device. This
hardware arrangement is shown in case B.
118
8207L-AT42-05/12
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