Features
• Number of Keys:
– One toggle mode (touch-on/touch-off), plus programmable auto-off delay and
external cancel
– 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 external capacitor (Cs)
• Interface:
– Digital output, active high or active low (hardware configurable)
• Moisture tolerance:
–Good
• Power:
– 1.8V ~ 5.5V; 32.5 µA at 1.8V
• Package:
– 6-pin SOT23-6 (3 x 3 mm) RoHS compliant
• Signal processing:
– Self-calibration, auto drift compensation, noise filtering
• Applications:
– Power switch replacement in countertop appliances, irons, battery powered toys,
heaters, lighting controls, automotive interior lighting, commercial and industrial
equipment such as soldering stations and cooking equipment
• Patents:
–QTouch® (patented charge-transfer method)
One-channel
Toggle-mode
Touch Sensor
IC with Power
Management
Functions
AT42QT1012
Summary
Note: This is a summary document.
A complete document is available.
For more information contact
www.atmel.com/touch.
9543CS–AT42–02/10
1. Pinout and Schematic
VDD
TIME
SNSK
VSS
OUT
4
1
2
3
5
6
SNS
QT1012
1.1 Pinout Configuration
1.2 Pin Descriptions
Table 1-1. Pin Listing
Pin Name Type Comments
1OUTO
2 Vss P Supply ground
3 SNSK I/O Sense pin. To Cs capacitor and to sense electrode
4 SNS I/O
5 Vdd P Power
Output state. To switched circuit and output polarity selection
resistor (Rop)
Sense pin. To Cs capacitor and multiplier configuration resistor
(Rm). Rm must be fitted and connected to either VSS or VDD.
6TIMEI
I Input only I/O Input and output
O Output only, push-pull P Ground or power
Timeout configuration pin. Must be connected to either VSS,
VDD, OUT or an RC network.
2
AT42QT1012
9543CS–AT42–02/10
1.3 Schematic
VDD
TIME
VSS
2
6
5
OUT
1
Rop
VDD
CS
SNSK
SNS
4
3
RS
Note: bypass capacitor to be tightly
wired between VDD and VSS and
kept close to pin 5.
SENSE
ELECTRODE
AT42QT1012
Figure 1-1. Basic Circuit Configuration
(active high output, toggle on/off, no auto switch off)
2. Overview of the AT42QT1012
2.1 Introduction
The AT42QT1012 (QT1012) is a single key device featuring a touch on/touch off (toggle) output
with a programmable auto switch-off capability.
The QT1012 is a digital burst mode charge-transfer (QT
™
) sensor designed specifically for touch
controls. It includes all hardware and signal processing functions necessary to provide stable
sensing under a wide variety of changing conditions; only low cost, noncritical components are
required for operation. With its tiny low-cost SOT-23 package, this device can suit almost any
product needing a power switch or other toggle-mode controlled function, especially power
control of small appliances and battery-operated products.
A unique “green” feature of the QT1012 is the timeout function, which can turn off power after a
specified time delay ranging from minutes to an hour.
Like all QTouch
®
devices, the QT1012 features automatic self-calibration, drift compensation,
and spread-spectrum burst modulation in order to provide for the most reliable touch sensing
possible.
9543CS–AT42–02/10
3
Revision History
Revision No. History
Revision A – August 2009 Initial release for chip revision 2.4
Revision B – September 2009 Changes to Cs value.
Revision CS – February 2010 Updated for chip revision 3.1
4
AT42QT1012
9543CS–AT42–02/10
Notes
AT42QT1012
9543CS–AT42–02/10
5
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9543CS–AT42–02/10
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