Rainbow Electronics AT42QT1012 User Manual
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
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