Instruction Manual

ManualsBrandsRainbow Electronics ManualsSoftwareAT42QT1012

Note: This is a summary document.

A complete document is available.

For more information contact

www.atmel.com/touch.

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

9543CS–AT42–02/10

Summary of content (6 pages)

PAGE 1
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 cop
PAGE 2
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.
PAGE 3
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.
PAGE 4
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.
PAGE 5
AT42QT1012 Notes 5 9543CS–AT42–02/10
PAGE 6
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.