IQS253MSR Azoteq

IQ Switch ProxSense Series TM IQS253 Datasheet - Congurable 3 Channel DYCAL Capacitive Sensor with Automatic Compensation for Sensitivity Reducing Objects Unparallelled Features: TM o DYCAL : Intelligent Hysteresis o Internal Capacitor Implementation (ICI) - Reference capacitor on-chip o Automatic Tuning Implementation (ATI) - Automatic adjustment for optimal sensor performance The IQS253 ProxSense IC is a fully integrated capacitive sensor implementing Dynamic Cali- TM bration (DYCAL ) technology: intelligent hysteresis to allow for sensor drift even during sensor activation. Main features: o Self or Projected Technology sensors TM o 3 Channels congurable as DYCAL /Normal output 2 o Self: Boolean direct output congurable through I C o Supply voltage: 1.8V to 3.6V o Internal voltage regulator o Advanced on-chip digital signal processing 2 o I C adjustable settings TM DYCAL settings Control over lter operation Time-out for stuck key Proximity and Touch sensitivity selections Low Power options Event Mode possible (only communicates if an event is detected) Applications: o Any applications where a touch and proxim- ity condition can exist for a extended pe- o Occupancy sensors riod of time o SAR Compliant sensors for Tablet PCs Advantages: o On-ear detection for mobile phones o Allows for sensor drift in periods of activation and non-activation o 3D glasses o Improved digital ltering to reduce external o Personal Media Players noise 2 o Remote Control Sleep implementation o Highly adjustable I C device which only in- terrupts (Event Mode) when an event is o Gaming Controllers detected o Proximity activated back lighting Copyright Azoteq (Pty) Ltd 2016 IQS253 Datasheet Page 1 of 60 All rights reserved Revision V1.10 October 2016 IQ Switch ProxSense Series Contents List of Figures 4 List of Tables 4 Revision History 4 List of Symbols 6 1 Functional Overview 7 1.1 Applicability 7 2 Analogue Functionality 7 3 Digital Functionality 8 4 Packaging and Pin-Out 9 4.1 IQS253 Self Capacitance . 9 4.2 IQS253 Projected . 10 4.3 Power Supply and PCB Layout 11 4.4 Design Rules for Harsh EMC Environments . 12 5 DYCAL 13 5.1 Operating Principle 14 6 ProxSense Module 15 6.1 Charge Transfer Concepts 15 7 Prox Module Setup 15 7.1 Self or Projected Capacitance 15 7.2 Rate of Charge Cycles 16 7.3 Report Rate 17 7.4 Active Channels 17 TM 7.5 DYCAL or Direct Output 17 7.6 Report Order (Channel Numbers) 17 7.7 Transfer Frequency (f ) 17 cx 7.8 Counts . 17 7.9 Long Term Average (LTA) . 17 7.10 Determine Touch or Prox . 19 7.11 ATI . 19 TM 8 DYCAL 20 TM 8.1 DYCAL channels enable 21 TM 8.2 DYCAL on TOUCH/PROX . 21 8.3 LTA Adapt rates (IN and OUT) 21 8.4 Block Channel . 21 TM 8.5 DYCAL Release Threshold 21 TM 8.6 DYCAL dynamic touch threshold . 21 8.7 10s ATI BLOCK . 21 8.8 250ms DELAY TM (t ) . 22 DYCAL 8.9 Turbo Mode 22 Copyright Azoteq (Pty) Ltd 2016 IQS253 Datasheet Page 2 of 60 All rights reserved Revision V1.10 October 2016