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A. QTouch Group A/B and Autonomous QTouch arrangement.
Resistive drive enabled on SNSK Line.
Atmel
B. QTouch Group A/B and Autonomous QTouch arrangement.
Resistive drive disabled on SNSK Line.
Atmel
AT32UC3L
SNSK
Sensor
AT32UC3L
SNSK
Rs
Sensor
CAT
Module
Cs
SNS
Typical Values:
Cs: 22nF
Pin requirements:
SNS: CAT QTouch method I/O pin
SNSK: CAT QTouch method I/O pin
C. QTouch Group A/B and Autonomous QTouch arrangement.
Resistive drive enabled on SNSK Line.
External Synchronization enabled.
Atmel
CAT
Module
SNS
Cs
Typical Values:
Cs: 22nF, Rs:1kOhm
Pin requirements:
SNS: CAT QTouch method I/O pin
SNSK: CAT QTouch method I/O pin
AT32UC3L
SNSK
CAT
Module
SNS
Cs
Typical Values:
Cs: 22nF
Sensor
SYNC
Sync
signal
Pin requirements:
SNS: CAT QTouch method I/O pin
SNSK: CAT QTouch method I/O pin
SYNC: CAT-SYNC I/O pin
Figure 40 QTouch Group A/B and Autonomous QTouch schematic arrangement
6.3.8.3
QTouch Group A/B method hardware resource requirement for UC3L
The clock for the CAT module, CLK_CAT, is generated by the Power Manager (PM). This clock is
turned on by default, and can be enabled and disabled in the PM. The user must ensure that
CLK_CAT is enabled before initializing the QTouch Library.
The QTouch method acquisition using the CAT module requires one Peripheral DMA channel
that must be provided by the application.
126
8207L-AT42-05/12
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