QT60168C-ASG Atmel, QT60168C-ASG Datasheet - Page 59

• Manufacturer Part Number: QT60168C-ASG
• Description: IC TOUCH SENSOR 16KEY 32TQFP
• Manufacturer: Atmel
• Series: QMatrix™, QProx™r
• Type: Capacitiver

Specifications of QT60168C-ASG

• Number Of Inputs/keys: 16 Key
• Resolution (bits): 9, 11 b
• Data Interface: Serial, SPI™
• Voltage - Supply: 3 V ~ 5 V
• Current - Supply: 25mA
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP, 32-VQFP
• Output Type: *
• Interface: *
• Input Type: *
• For Use With: 427-1087 - BOARD EVAL QT60248-AS QMATRIX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.3.3
Touch Sensors Design Guide
One-Layer Medium/Large Slider Or Wheel
3. Apply the rules in
Equation 6-9. Calculation for X
4. Determine where the gaps between the keys occur by calculating the number of X fingers in each
You can now draw the wheel. Note that the X fingers taper to Y
and this tapering will determine the inner diameter of the wheel.
Spatially interpolating a one-layer interdigitated key array to make a longer slider or a large wheel is not
a good way to increase slider length or wheel diameter. While it is possible to design sliders and wheels
in this way, the complexity of doing so makes the use of a resistively interpolated slider or wheel much
more favorable.
See
Layer Medium/Large Slider Or Wheel” on page 6-11
interpolated slider or wheel.
X
key (X
Section 6.4.2 “One-Layer Medium/Large Slider Or Wheel” on page 6-10
fingers
fingers
(see
/ keys).
Figure 6-2
X

X
Where:

nominalfingers
fingers
number; that is, round down to the nearest integer. For example,

...
Section 4.2.2 “X and Y Electrodes” on page 4-2

= (
is the FLOOR operator, defined as the largest integer not greater than the

for definitions).
X
=
nominalfingers

D / (2T + Y
fingers
For a Wheel
/ keys
width

) x keys
)
 
Mutual-capacitance One-dimensional Sensors
for more information on designing a resistively
width
or slightly greater (not sharp points),
and use
Equation 6-9
or
Section 6.4.3 “Two-

6.6

10620D–AT42–04/09
is 6.
to calculate
6-5