AT42QT1010
AT42QT1010 Data Sheet
Introduction
The AT42QT1010 is a digital burst mode charge-transfer sensor that is capable of detecting near
proximity or touch, making it ideal for implementing touch controls.
The QT1010 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.
Features
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Number of Keys:
– One – configurable as either a single key or a proximity sensor
Technology:
– Patented spread-spectrum charge-transfer (direct mode)
Key outline sizes:
– 6 mm × 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:
– Increased moisture tolerance based on hardware design and firmware tuning
Operating Voltage:
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©
2017 Microchip Technology Inc.
Datasheet
DS40001946A-page 1
AT42QT1010
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– 1.8 V – 5.5 V; 17 µA at 1.8 V typical
Package:
– 6-pin SOT23-6 RoHS compliant
– 8-pin UDFN/USON RoHS compliant
Signal processing:
– Self-calibration, auto drift compensation, noise filtering
Applications:
– Control panels, consumer appliances, proximity sensor applications, toys, lighting controls,
mechanical switch or button,
Patents:
®
– QTouch technology (patented charge-transfer method)
– HeartBeat (monitors health of device)
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©
2017 Microchip Technology Inc.
Datasheet
DS40001946A-page 2
Table of Contents
Introduction......................................................................................................................1
Features.......................................................................................................................... 1
1. Pinout and Schematic................................................................................................5
1.1.
1.2.
1.3.
Pinout Configurations................................................................................................................... 5
Pin Descriptions........................................................................................................................... 5
Schematics...................................................................................................................................6
2. Overview of the AT42QT1010................................................................................... 8
2.1.
2.2.
2.3.
2.4.
Introduction...................................................................................................................................8
Basic Operation............................................................................................................................8
Electrode Drive.............................................................................................................................8
Sensitivity..................................................................................................................................... 8
3. Operation Specifics................................................................................................. 10
3.1.
3.2.
3.3.
3.4.
3.5.
3.6.
3.7.
3.8.
3.9.
Run Modes................................................................................................................................. 10
Threshold....................................................................................................................................11
Max On-duration.........................................................................................................................12
Detect Integrator.........................................................................................................................12
Forced Sensor Recalibration......................................................................................................12
Drift Compensation.....................................................................................................................12
Response Time.......................................................................................................................... 13
Spread Spectrum....................................................................................................................... 13
Output Features......................................................................................................................... 13
4. Circuit Guidelines.................................................................................................... 15
4.1.
4.2.
4.3.
4.4.
4.5.
More Information........................................................................................................................ 15
Sample Capacitor.......................................................................................................................15
UDFN/USON Package Restrictions........................................................................................... 15
Power Supply and PCB Layout.................................................................................................. 15
Power On................................................................................................................................... 16
5. Specifications.......................................................................................................... 17
5.1.
5.2.
5.3.
5.4.
5.5.
5.6.
5.7.
5.8.
5.9.
Absolute Maximum Specifications..............................................................................................17
Recommended Operating Conditions........................................................................................ 17
AC Specifications....................................................................................................................... 17
Signal Processing.......................................................................................................................19
DC Specifications....................................................................................................................... 20
Mechanical Dimensions............................................................................................................. 21
Part Marking............................................................................................................................... 23
Part Number............................................................................................................................... 23
Moisture Sensitivity Level (MSL)................................................................................................ 24
6. Associated Documents............................................................................................25
©
2017 Microchip Technology Inc.
Datasheet
DS40001946A-page 3
AT42QT1010
7. Revision History.......................................................................................................26
The Microchip Web Site................................................................................................ 27
Customer Change Notification Service..........................................................................27
Customer Support......................................................................................................... 27
Microchip Devices Code Protection Feature................................................................. 27
Legal Notice...................................................................................................................28
Trademarks................................................................................................................... 28
Quality Management System Certified by DNV.............................................................29
Worldwide Sales and Service........................................................................................30
©
2017 Microchip Technology Inc.
Datasheet
DS40001946A-page 4
AT42QT1010
1.
1.1
1.1.1
Pinout and Schematic
Pinout Configurations
6-pin SOT23-6
Pin 1 ID
SYNC/
MODE
OUT
1
6
VSS
2
5
VDD
SNSK
3
4
SNS
1.1.2
8-pin UDFN/USON
Pin 1 ID
SNSK
N/C
N/C
VSS
1
2
3
4
8
7
6
5
SNS
VDD
SYNC/MODE
OUT
1.2
1.2.1
Pin Descriptions
6-pin SOT23-6
Table 1-1. Pin Listing
Name Pin Type Comments
OUT
VSS
1
2
O
P
I/O
I/O
P
I
Output state
Supply ground
Sense pin
Sense pin
Power
If Unused, Connect To...
—
—
Cs + Key
Cs
—
SNSK 3
SNS
VDD
4
5
SYNC 6
SYNC and Mode Input Pin is either SYNC/Slow/Fast Mode, depending on logic
level applied (see
Section 3.1)
©
2017 Microchip Technology Inc.
Datasheet
DS40001946A-page 5
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