AT42QT1040-MMH Atmel, AT42QT1040-MMH Datasheet - Page 63

• Manufacturer Part Number: AT42QT1040-MMH
• Description: IC TOUCH SENSOR 4KEY 20-VQFN
• Manufacturer: Atmel
• Series: QTouch™r
• Type: Resistiver

Specifications of AT42QT1040-MMH

• Touch Panel Interface: 4, 2-Wire
• Number Of Inputs/keys: 4 Key
• Data Interface: I²C, Serial
• Data Rate/sampling Rate (sps, Bps): 200k
• Voltage Reference: Internal
• Voltage - Supply: 1.8 V ~ 5.5 V
• Current - Supply: 10mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFN
• Output Type: Logic
• Input Type: Logic
• Supply Voltage: 1.8 V to 5.5 V
• Dimensions: 3 mm L x 3 mm W x 0.8 mm H
• Output Voltage: 0.7 V to 0.8 V
• Temperature Range: - 40 C to + 85 C
• Termination Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: AT42QT1040-MMH; AT42QT1040-MMHTR

6.3.5.3
Touch Sensors Design Guide
Wheel
To form a wheel, the design is wrapped around to form a circle, the X segments becoming curved tooth
shapes (see
Figure 6-7.
Figure 6-7 on page
Two-layer Medium/Large Wheel (Spatially Interpolated)
X Electrodes x n
360°
n
6-9).
3
4
x
360°
n
4 mm
4 mm
4 mm
4 mm
2 mm
Mutual-capacitance One-dimensional Sensors
Arc center is coincident with the middle
of the bisecting line in center third segment
4 mm
4 mm
4 mm 2 mm
Y Rings
10620D–AT42–04/09
6-9