AT42QT2161-MMU Atmel, AT42QT2161-MMU Datasheet - Page 9

• Manufacturer Part Number: AT42QT2161-MMU
• Description: IC TOUCH SENSOR 16KEY QFN M-MOD
• Manufacturer: Atmel
• Type: Capacitiver

Specifications of AT42QT2161-MMU

• Touch Panel Interface: 8, 2-Wire
• Number Of Inputs/keys: 16 Key, Slider
• Resolution (bits): 10 b
• Data Interface: I²C, Serial
• Voltage Reference: Internal
• Voltage - Supply: 1.8 V ~ 5.5 V
• Current - Supply: 1.14mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9614A–AT42–08/10
Unlike other QT circuits, the Cs capacitor values on QT2161 devices have no effect on
conversion gain. However, they do affect conversion time.
Unused Y lines should be left open.
Figure 3-1.
Figure 3-2.
Figure 3-3.
VCs – Nonlinear During Burst
(Burst too long, or Cs too small, or X-Y transcapacitance too large)
VCs – Poor Gain, Nonlinear During Burst
(Excess capacitance from Y line to Gnd)
VCs – Correct
X Drive
X Drive
X Drive
YnB
YnB
YnB
AT42QT2161
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