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 Technology: – 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 1.1 OUT 1 VSS 2 SNSK 3 6 TIME 5 VDD 4 SNS Pin Descriptions Table 1-1. 2 QT1012 1.2 Pinout Configuration Pin Listing Pin Name Type Comments 1 OUT O Output state. To switched circuit and output polarity selection resistor (Rop) 2 Vss P Supply ground 3 SNSK I/O Sense pin. To Cs capacitor and to sense electrode 4 SNS I/O Sense pin. To Cs capacitor and multiplier configuration resistor (Rm). Rm must be fitted and connected to either VSS or VDD. 5 Vdd P Power 6 TIME I Timeout configuration pin. Must be connected to either VSS, VDD, OUT or an RC network. I Input only I/O Input and output O Output only, push-pull P Ground or power AT42QT1012 9543CS–AT42–02/10 AT42QT1012 1.3 Schematic Figure 1-1. Basic Circuit Configuration (active high output, toggle on/off, no auto switch off) Note: bypass capacitor to be tightly wired between VDD and VSS and kept close to pin 5. VDD SENSE ELECTRODE 5 VDD RS 3 OUT 1 SNSK CS 4 SNS Rop TIME 6 VSS 2 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. 3 9543CS–AT42–02/10 Revision History 4 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 AT42QT1012 9543CS–AT42–02/10 AT42QT1012 Notes 5 9543CS–AT42–02/10 Headquarters International Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Asia Unit 01-05 & 16, 19/F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong Kowloon Hong Kong Tel: (852) 2245-6100 Fax: (852) 2722-1369 Atmel Europe Le Krebs 8, Rue Jean-Pierre Timbaud BP 309 78054 Saint-Quentin-enYvelines Cedex France Tel: (33) 1-30-60-70-00 Fax: (33) 1-30-60-71-11 Atmel Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Technical Support [email protected] Sales Contact www.atmel.com/contacts Touch Technology Division 1 Mitchell Point Ensign Way Hamble Southampton Hampshire SO31 4RF United Kingdom Tel: (44) 23-8056-5600 Fax: (44) 23-8045-3939 Product Contact Web Site www.atmel.com Literature Requests www.atmel.com/literature Disclaimer: The information in this document is provided in connection with Atmel products. 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