AT42QT1070-SSU Atmel, AT42QT1070-SSU Datasheet - Page 37

IC TOUCH SENSOR 7KEY 14-SOIC

AT42QT1070-SSU

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

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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT42QT1070-SSU
Manufacturer:
ATMEL
Quantity:
2 000
Part Number:
AT42QT1070-SSU QS529
Manufacturer:
Atmel
Quantity:
4 905
4.2.2.9
Touch Sensors Design Guide
Merging X Regions
Figure 4-4.
Due to the key size and panel thickness, the resulting key is far from ideal and has a lack of
interdigitation – there is only one X finger! Such a low degree of interdigitation leads to very low key Cx
and a lack of sensitivity. It also tends to render the design more susceptible to Cp on the Y line
small keys with relatively long interconnections and thick panels are a bad combination.
As can be seen from this example, designs with smaller keys and thicker panels make effective
interdigitation very hard when following the guidelines. In such cases, it is better to break the guidelines
by closing the gaps slightly (0.75 x T/2 minimum) and thinning down the X regions.
See also
For keys that share the same X line, the X regions can be merged, as shown in
Figure 4-5.
1. The ratio of Cx to Cpy is important as the maximum QMatrix terminal voltage that can be accumulated is directly
proportional to this ratio. If the ratio is too small, it may be impossible to achieve acceptable key performance.
Section 3.2.3 “Ground Loading” on page 3-3
Example Resulting In Low Interdigitation
Merged X Regions
1.5 mm
1.6 mm
(Lines Merged)
X Electrode
8 mm
0.75 mm
Mutual-capacitance Zero-dimensional Sensors
for suggested compromises.
2.02 mm
Y Electrode
8 mm
Figure
4-5.
10620D–AT42–04/09
(1)
. Hence
4-5

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