AT42QT1070-SSU Atmel, AT42QT1070-SSU Datasheet - Page 59

• Manufacturer Part Number: AT42QT1070-SSU
• Description: IC TOUCH SENSOR 7KEY 14-SOIC
• Manufacturer: Atmel
• Type: Capacitiver

Specifications of AT42QT1070-SSU

• Number Of Inputs/keys: 7 Key (Comms), 5 Key (Standalone)
• Data Interface: I²C
• Voltage Reference: Internal
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Supply Voltage: 1.8 V to 5.5 V
• Dimensions: 3 mm L x 3 mm W x 0.8 mm H
• Temperature Range: - 40 C to + 85 C
• Termination Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Resolution (bits): -
• Touch Panel Interface: -
• Data Rate/sampling Rate (sps, Bps): -
• 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