Datasheet
34
9596A–AT42–10/10
AT42QT1070
Contents
Features ..................................................................................................... 1
1 Pinouts and Schematics ......................................................................... 2
1.1 Pinout Configuration – Comms Mode (14-pin SOIC) .........................................2
1.2 Pinout Configuration – Standalone Mode (14-pin SOIC)....................................2
1.3 Pinout Configuration – Comms Mode (20-pin VQFN) ........................................3
1.4 Pinout Configuration – Standalone Mode (20-pin VQFN) ..................................3
1.5 Pin Descriptions..................................................................................................4
1.6 Schematics .........................................................................................................6
2 Overview ................................................................................................... 9
2.1 Introduction.........................................................................................................9
2.2 Modes.................................................................................................................9
2.2.1 Comms Mode ............................................................................... 9
2.2.2 Standalone Mode.......................................................................... 9
2.3 Keys....................................................................................................................9
2.4 Input/Output (IO) Lines.......................................................................................9
2.5 Acquisition/Low Power Mode (LP)....................................................................10
2.6 Adjacent Key Suppression (AKS) Technology .................................................10
2.7 CHANGE Line (Comms Mode Only) ................................................................10
2.8 Proximity Sensing.............................................................................................11
2.9 Types of Reset .................................................................................................11
2.9.1 External Reset ............................................................................ 11
2.9.2 Soft Reset ................................................................................... 11
2.10 Calibration ........................................................................................................11
2.11 Guard Channel .................................................................................................11
2.12 Signal Processing.............................................................................................12
2.12.1 Detect Threshold ........................................................................ 12
2.12.2 Detect Integrator ......................................................................... 12
2.12.3 Cx Limitations ............................................................................. 12
2.12.4 Max On Duration......................................................................... 13
2.12.5 Positive Recalibration ................................................................. 13
2.12.6 Drift Hold Time............................................................................ 13
2.12.7 Hysteresis ................................................................................... 13