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Contents 1 Overview ........................................... 3 4 Operating Modes ................................... 11 1.1 Introduction ....................................... 3 4.1 Introduction ...................................... 11 1.2 Burst Operation .................................... 3 4.2 Free Run Mode ................................... 11 1.3 User Interface Layout Options .......................... 3 4.3 LP Mode ........................................ 11 1.4 Slider and Wheel Construction .......................... 3 4.4 Sleep Mode ...................................... 12 1.5 QMagicTM Proximity Effect ............................ 3 4.5 Sync Mode ....................................... 12 1.6 SPI Interface ...................................... 3 5 Reset ............................................. 14 1.7 Basic Power Modes ................................. 4 5.1 Introduction ...................................... 14 1.7.1 Overview ....................................... 4 5.2 Delay to SPI Functionality ............................ 14 1.7.2 Free Run Mode ................................... 4 5.3 Reset Delay to Touch Detection ........................ 14 1.7.3 LP Mode ....................................... 4 5.4 Mode Setting After Reset ............................. 14 1.7.4 Sleep Mode ..................................... 4 6 Design Notes ...................................... 14 1.7.5 Sync Mode ..................................... 4 6.1 Oscillator Frequency ................................ 14 2 Signal Processing ................................... 4 6.2 Spread-spectrum Circuit ............................. 14 2.1 Power-up Self-calibration .............................. 4 6.3 Cs Sample Capacitors - Sensitivity ...................... 14 2.2 Drift Compensation .................................. 4 6.4 Rsns Resistors .................................... 15 2.3 Detection Integrator Filter .............................. 4 6.5 Thermal Stability ................................... 15 2.4 AKSTM Adjacent Key Suppression ....................... 4 6.6 Power Supply ..................................... 15 2.5 Autorecalibration (MOD) .............................. 4 6.7 PCB Layout and Construction .......................... 15 2.6 QMagicTM Proximity sensor ........................... 5 7 Specifications ...................................... 16 2.7 Faulty and Unused Keys .............................. 5 7.1 Absolute Maximum Specifications ....................... 16 2.8 Wiring ........................................... 6 7.2 Recommended Operating Conditions .................... 16 3 SPI Interface ........................................ 8 7.3 AC Specifications .................................. 16 3.1 Introduction ....................................... 8 7.4 DC Specifications .................................. 16 3.2 CHANGE Pin ...................................... 8 7.5 Signal Processing ................................. 17 3.3 SPI Parameters .................................... 8 7.6 Idd Curves ....................................... 18 3.4 SPI Operation ..................................... 8 7.7 Mechanical Dimensions - 32-QFN Package ................ 20 3.5 SPI Host Commands ................................ 9 7.8 Part Marking ..................................... 20 3.5.1 Overview ....................................... 9 7.9 Moisture Sensitivity Level (MSL) ........................ 21 3.5.2 Normal Command Mode .............................. 9 8 Datasheet Control ................................... 22 3.5.3 Custom Threshold Command Mode ...................... 10 8.1 Changes ........................................ 22 3.6 SPI Responses .................................... 10 8.2 Numbering Convention .............................. 22 2QT1106_8 I R0.07_0907
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