ATAVRQTOUCHX Atmel, ATAVRQTOUCHX Datasheet - Page 35

• Manufacturer Part Number: ATAVRQTOUCHX
• Description: BOARD EVAL CAPACITIVE TOUCH
• Manufacturer: Atmel
• Series: QTouch™r

Specifications of ATAVRQTOUCHX

• Sensor Type: Touch, Capacitive
• Sensing Range: 1 Slider, 1 Wheel, 2 Buttons
• Interface: USB
• Voltage - Supply: 5V, USB
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: AT90USB1287, ATxmega128A1
• Silicon Manufacturer: Atmel
• Silicon Family Name: ATxmega
• Kit Contents: Board
• Svhc: No SVHC (15-Dec-2010)
• Core Architecture: AVR
• Core Sub-architecture: AVR19
• Kit Features: One Slider, One Wheel And 2
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5.6.6.1.1.1 Channel numbering when routing SNS and SNSK pins to different ports
Figure 5-7 illustrates a sample QTouch capacitive sensing solution which uses four ports (two
port pairs ) on a device for routing the SNS and SNSK lines required.
When SNS and SNSK pins are available on different ports, the channel numbering follows the pin
numbering in the ports selected, when pin configurability is not used.
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The channel numbers follow the pin numbers starting with the LSB (pin 0 is channel 0
and pin 7 is channel 7).
When a library on corresponding device is configured to use more than two ports for SNS
and SNSK pins, the channel numbers in the second set of SNS/SNSK port pair continue
from the preceding pair as illustrated in Figure 5-7(pin 0 of next port pair is channel 8 and
pin 7 of the next port pair is channel 15).
Support for more than one pair of SNS and SNSK ports are not available for UC3™
devices.
SNS pins within a single port and SNSK pins within another single port can only be used
as channels for slider/rotor. Slider/Rotor channels cannot share SNS/SNSK pins on
different ports.
Since the channel numbers are fixed to the pins of the SNS and SNSK ports, if the
design calls for use of a subset of the pins available in the SNS and SNSK ports, the user
has to skip the channel numbers of the unused SNS and SNSK pins.
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For example, on a 8 channel configuration using a single pair of SNS and SNSK
ports, if pin 2 is not used for touch sensing ( on both SNS and SNSK ports),
channel number 2 is unavailable and care should be taken while configuring the
channels and sensors to avoid using this channel.
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