Features
• Number of Keys:
–One
– Configurable as either a single key or a proximity sensor
• Techn ology:
– Patented spread-spectrum charge-transfer (direct mode)
• Key outline sizes:
– 6 mm x 6 mm or larger (panel thickness dependent); widely different sizes and
shapes possible
• Electrode design:
– Solid or ring electrode shapes
• PCB Layers required:
–One
• Electrode materials:
– Etched copper, silver, carbon, Indium Tin Oxide (ITO)
• Electrode substrates:
– PCB, FPCB, plastic films, glass
• Panel materials:
– Plastic, glass, composites, painted surfaces (low particle density metallic paints
possible)
• Panel thickness:
– Up to 12 mm glass, 6 mm plastic (electrode size and Cs dependent)
• Key sensitivity:
– Settable via capacitor (Cs)
• Interface:
– Digital output, active high
• Moisture tolerance:
–Good
• Power:
– 1.8V – 5.5V; 17 µA at 1.8V typical
• Package:
– 6-pin SOT23-6 RoHS compliant
• Signal processing:
– Self-calibration, auto drift compensation, noise filtering
– Infinite max on-duration
• Applications:
– Control panels, consumer appliances, proximity sensor applications, toys,
lighting controls, mechanical switch or button,
• Patents:
–QTouch
– HeartBeat™ (monitors health of device)
®
(patented charge-transfer method)
One-channel
Touch Sensor
IC
AT42QT1011
Summary
Note: This is a summary document.
A complete document is available.
For more information contact
www.atmel.com/touch.
9542ES–AT42–02/10
1. Pinout and Schematic
SNSK
VSS
OUT
4
1
2
3
5
6
VDD
SNS
SYNC/MODE
1.1 Pinout Configuration
1.2 Pin Descriptions
Table 1-1. Pin Listing
Name Pin Type Comments If Unused, Connect To...
OUT 1 O Output state –
Vss 2 P Supply ground –
SNSK 3 I/O Sense pin Cs + Key
SNS 4 I/O Sense pin Cs
Vdd 5 P Power –
SYNC 6 I SYNC and Mode Input
I Input only I/O Input and output
O Output only, push-pull P Ground or power
Pin is either SYNC/Slow/Fast Mode, depending on logic level
applied
2
AT42QT1011
9542ES–AT42–02/10
1.3 Schematic
Cs
OUT
VDD
SNSK
SNS
SYNC/MODE
VSS
2
6
4
3
1
5
VDD
Rs
Cx
SENSE
ELECTRODE
Note: A bypass capacitor should be tightly wired
between Vdd and Vss and kept close to pin 5.
AT42QT1011
Figure 1-1. Basic Circuit Configuration
2. Overview of the AT42QT1011
The AT42QT1011 (QT1011) is a digital burst mode charge-transfer (QT™) sensor that is capable
of detecting near-proximity or touch, making it ideal for implementing touch controls.
With the proper electrode and circuit design, the self-contained digital IC will project a touch or
proximity field to several centimeters through any dielectric like glass, plastic, stone, ceramic,
and even most kinds of wood. It can also turn small metal-bearing objects into intrinsic sensors,
making them responsive to proximity or touch. This capability, coupled with its ability to
self-calibrate, can lead to entirely new product concepts.
The QT1011 is designed specifically for human interfaces, like control panels, appliances, toys,
lighting controls, or anywhere a mechanical switch or button may be found. It includes all
hardware and signal processing functions necessary to provide stable sensing under a wide
variety of changing conditions. Only a single low-cost capacitor is required for operation.
9542ES–AT42–02/10
3
Revision History
Revision No. History
Revision A – May 2009 Initial release
Revision B – August 2009 Updated for chip revision 2.2.2
Revision C – August 2009 Minor updates for clarity
Revision D – January 2010 Updated for revision 2.4.1
Revision ES – February 2010 Minor updates
4
AT42QT1011
9542ES–AT42–02/10
Notes
AT42QT1011
9542ES–AT42–02/10
5
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Touch Technology Division
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Product Contact
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Technical Support
touch@atmel.com
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Sales Contact
www.atmel.com/contacts
Literature Requests
www.atmel.com/literature
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© 2009 – 2010 Atmel Corporation. All rights reserved. Atmel®, Atmel logo and combinations thereof, QTouch® and others are registered
trademarks, QT
™
, HeartBeat™ and others are trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be
registered trademarks or trademarks of others.
9542ES–AT42–02/10
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