IQS316-0-QFR Azoteq

IQS316 Datasheet IQ Switch - ProxSense Series Multi-channel Capacitive Sensing Controller with Advanced Signal Processing Functions The IQS316 is a 20 channel surface capacitive touch and proximity controller with advanced on- chip signal processing features, including Antenna Tuning Implementation (ATI). Proximity detection can be distributed over all keys, or only selected keys, providing high flexibility for stable operation in varying designs. The controller is based on patented capacitive sensing technology that yields stability with high sensitivity and excellent noise immunity. This controller can operate with a small number of external components to provide a low cost solution for medium to high channel count applications. Main Features 16 Touch Keys with distributed Proximity Sensing Internal Capacitor Implementation (ICI). No external reference capacitors required Class leading proximity sensitivity with dedicated Prox Mode charging scheme User selectable gain through Antenna Tuning Implementation (ATI) All channels individually configurable for maximum design flexibility Advanced on-chip signal processing 2 User selectable I C and SPI communication High sensitivity Internal voltage regulator Supply voltage 2.85V-5.5V Low power modes (45uA) Active shield options RF detection Available in QFN(5x5)-32 package Representation 8 General Purpose I/Os only, not actual marking Applications Office machines Consumer Electronics Digital cameras White goods and appliances Keypads Kiosk and POS Terminals High-end kitchen appliances Launch a menu on user approaching Personal Media Players Available options T QFN32 A -40C to 85C IQS316 Copyright Azoteq (Pty) Ltd 2015 IQS316 Datasheet Page 1 of 28 All rights reserved. Revision 1.03 November 2015 IQ Switch ProxSense Series 5.2.2 Cx Sensors Requiring Shield ....................... 12 5.2.3 Cx Sensors Used For Prox ........................... 12 Contents 5.2.4 Cx Sensors plus I/Os .................................. 13 5.2.5 Unused Cxs ................................................ 13 IQS316 Datasheet ........................................................... 1 6 Communication .................................................... 13 1 Overview ................................................................ 3 6.1 Communication Selection ............................... 13 2 Packaging and Pin-out ............................................ 4 6.2 Watchdog Timeout and MCLR ....................... 13 2.1 QFN32............................................................... 4 6.3 SPI ................................................................... 13 6.3.1 SPI read ...................................................... 14 2.2 ICTRL ................................................................. 5 6.3.2 SPI write ..................................................... 14 6.3.3 SPI Communications Window Terminate 3 ProxSense Module ................................................ 5 Command ................................................................ 15 3.1 Charge Transfer Concepts ................................ 5 2 6.4 I C ................................................................... 15 3.2 Charging Modes ............................................... 6 6.4.1 Control byte and Device Address ............... 15 2 3.2.1 Prox Mode Charging .................................... 6 6.4.2 I C read....................................................... 15 2 3.2.2 Touch Mode Charging .................................. 6 6.4.3 I C write ..................................................... 15 2 3.2.3 Interaction Between Prox and Touch Mode 7 6.4.4 IC Communications Window Terminate 3.2.4 Low Power Charging .................................... 7 Command ................................................................ 16 3.3 Prox Module Setup ........................................... 8 6.5 Circuit diagrams (all features) ........................ 16 3.3.1 Report rate ................................................... 8 3.3.2 Transfer Frequency ...................................... 8 7 Electrical specifications ......................................... 18 3.3.3 Count Value.................................................. 8 7.1 Absolute maximum specifications .................. 18 3.3.4 Prox Mode Channel Filters ........................... 8 3.3.5 Environmental Drift ..................................... 8 7.2 Operating conditions (Measured at 25C) ...... 18 3.3.6 LTA Filter ...................................................... 8 7.3 Moisture Sensitivity Level ............................... 18 3.3.7 Filter Halt ..................................................... 8 3.3.8 Touch Sensitivity (Touch Mode channels 7.4 Recommended storage environment for ICs . 19 only) 9 7.5 Timing characteristics (Measured at 25C) .... 20 3.3.9 Proximity Sensitivity (Prox and Touch Mode channels) ................................................................... 9 8 Mechanical Dimensions ........................................ 21 3.3.10 Antenna Tuning Implementation ............ 9 8.1 IQS316 Mechanical Dimensions ..................... 21 4 Additional Features .............................................. 10 8.1.2 QFR package differences to QNR package . 22 4.1 RF Immunity ................................................... 10 8.2 IQS316 Landing Pad Layout ............................ 23 4.1.1 Design Guidelines....................................... 10 4.1.2 RF detection ............................................... 10 9 Datasheet and Part-number Information ............. 24 4.2 Active Shield ................................................... 10 9.1 Ordering Information ..................................... 24 4.3 Proximity Output (POUT) ................................ 11 9.2 Package Marking............................................ 24 4.4 Zero Cross Synchronising ................................ 11 9.3 Tape and Reel ................................................. 25 4.5 Device Sleep .................................................... 11 9.5 Revision History .............................................. 27 4.6 Communication Bypass .................................. 11 Appendix A. Contact Information............................. 28 4.7 General Purpose I/Os .................................... 12 5 Application Design ............................................... 12 5.1 Physical Layout ............................................... 12 5.2 Cx Selection .................................................... 12 5.2.1 Cx Sensor Close to Noise Source ................ 12 Copyright Azoteq (Pty) Ltd 2015 IQS316 Datasheet Page 2 of 28 All rights reserved. Revision 1.03 November 2015