AT32UC3L064-D3HES ATMEL [ATMEL Corporation], AT32UC3L064-D3HES Datasheet - Page 653
AT32UC3L064-D3HES
Manufacturer Part Number
AT32UC3L064-D3HES
Description
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT32UC3L064-D3HES.pdf
(830 pages)
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28. Capacitive Touch Module (CAT)
28.1
28.2
32099D–06/2010
Features
Overview
Rev: 2.0.0.1
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The Capacitive Touch Module (CAT) senses touch on external capacitive touch sensors. Capac-
itive touch sensors use no external mechanical components, and therefore demand less
maintenance in the user application.
The module implements the QTouch method of capturing signals from capacitive touch sensors.
The QTouch method is generally suitable for small numbers of sensors since it requires 2 physi-
cal pins per sensor. The module also implements the QMatrix method, which is more
appropriate for large numbers of sensors since it allows an X by Y matrix of sensors to be imple-
mented using only (X+2Y) physical pins. The module allows methods to function together, so N
touch sensors and an X by Y matrix of sensors can be implemented using (2N+X+2Y) physical
pins.
In addition, the module allows sensors using the QTouch method to be divided into two groups.
Each QTouch group can be configured with different properties. This eases the implementation
of multiple kinds of controls such as push buttons, wheels, and sliders.
The module also implements one autonomous QTouch sensor that is capable of detecting touch
or proximity without CPU intervention. This allows proximity or activation detection in low-power
sleep modes.
QTouch™ method allows N touch sensors to be implemented using 2N physical pins
QMatrix™ method allows X by Y matrix of sensors to be implemented using (X+2Y) physical pins
One autonomous QTouch™ sensor operates without CPU intervention
Interfaced with peripheral DMA controller to reduce processor overhead
External synchronization to reduce 50 or 60 Hz mains interference
Spread spectrum sensor drive capability
AT32UC3L016/32/64
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