QT60248C-ASG Atmel, QT60248C-ASG Datasheet - Page 65

• Manufacturer Part Number: QT60248C-ASG
• Description: IC TOUCH SENSOR 24KEY 32TQFP
• Manufacturer: Atmel
• Series: QMatrix™, QProx™r
• Type: Capacitiver

Specifications of QT60248C-ASG

• Number Of Inputs/keys: 24 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

6.4.3
Touch Sensors Design Guide
Two-Layer Medium/Large Slider Or Wheel
Creating larger sliders and wheels when using a flooded X design follows the same principles as in
Section 6.3.5 “Two-layer Medium/Large Slider Or Wheel” on page
introduced using resistive dividers on the X lines.
Figure 6-10. Two-layer Medium/Large Slider (Resistively Interpolated)
Figure 6-11. Two-layer Medium/Large Wheel (Resistively Interpolated)
X -1
n
Extra R
esistive Segment(s) For
For X Electrode
Extra Resistive
Rtotal typically 2 k to 10
Segment(s)
X0
W
X Electrode
kW
X 2
n-
Mutual-capacitance One-dimensional Sensors
Rtotal typically
2 k to 10
X1
W
X0
6-8, except that extra segments are
kW
For design rules, see
Figure 6-6 on page 6-8
For design rules, see
Figure 6-7 on page 6-9
10620D–AT42–04/09
6-11