ATAVRQTOUCHX Atmel, ATAVRQTOUCHX Datasheet - Page 38

• 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

5.6.6.1.2
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:
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.
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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
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.
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.
Figure 5-9: Channel Numbering for QMatrix acquisition method libraries
Channel numbering when using QMatrix acquisition method
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