Table of Contents
Introduction......................................................................................................................1
Features.......................................................................................................................... 1
1. Pinout and Schematic................................................................................................5
1.1. Pinout Configurations................................................................................................................... 5
1.2. Pin Descriptions........................................................................................................................... 5
1.3. Schematics...................................................................................................................................6
2. Overview of the AT42QT1010................................................................................... 8
2.1. Introduction...................................................................................................................................8
2.2. Basic Operation............................................................................................................................8
2.3. Electrode Drive.............................................................................................................................8
2.4. Sensitivity..................................................................................................................................... 8
3. Operation Specifics................................................................................................. 10
3.1. Run Modes................................................................................................................................. 10
3.2. Threshold....................................................................................................................................11
3.3. Max On-duration.........................................................................................................................12
3.4. Detect Integrator.........................................................................................................................12
3.5. Forced Sensor Recalibration......................................................................................................12
3.6. Drift Compensation.....................................................................................................................12
3.7. Response Time.......................................................................................................................... 13
3.8. Spread Spectrum....................................................................................................................... 13
3.9. Output Features......................................................................................................................... 13
4. Circuit Guidelines.................................................................................................... 15
4.1. More Information........................................................................................................................ 15
4.2. Sample Capacitor.......................................................................................................................15
4.3. UDFN/USON Package Restrictions........................................................................................... 15
4.4. Power Supply and PCB Layout.................................................................................................. 15
4.5. Power On................................................................................................................................... 16
5. Specifications.......................................................................................................... 17
5.1. Absolute Maximum Specifications..............................................................................................17
5.2. Recommended Operating Conditions........................................................................................ 17
5.3. AC Specifications....................................................................................................................... 17
5.4. Signal Processing.......................................................................................................................19
5.5. DC Specifications....................................................................................................................... 20
5.6. Mechanical Dimensions............................................................................................................. 21
5.7. Part Marking............................................................................................................................... 23
5.8. Part Number............................................................................................................................... 23
5.9. Moisture Sensitivity Level (MSL)................................................................................................ 24
6. Associated Documents............................................................................................25
© 2017 Microchip Technology Inc.
Datasheet
DS40001946A-page 3
