Document
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 onchip 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
User selectable I2C 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 8 General Purpose I/O’s
Applications
Representation only, not actual
marking
Office machines Digital cameras Keypads High-end kitchen appliances Personal Media Players
Consumer Electronics White goods and appliances Kiosk and POS Terminals Launch a menu on user approaching
Available options
TA -40°C to 85°C
QFN32 IQS316
Copyright © Azoteq (Pty) Ltd 2015 All rights reserved.
IQS316 Datasheet Revision 1.02
Page 1 of 27 April 2015
IQ Switch® ProxSense® Series
Contents
IQS316 Datasheet ...........................................................1
5.2.2 5.2.3 5.2.4 5.2.5
Cx Sensors Requiring Shield ....................... 12 Cx Sensors Used For Prox........................... 12 Cx Sensors plus I/O’s.................................. 13 Unused Cx’s................................................ 13
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
2.2 ICTRL................................................................. 5
3 ProxSense® Module ................................................5
3.1 Charge Transfer Concepts ................................ 5
3.2 Charging Modes ............................................... 6 3.2.1 Prox Mode Charging .................................... 6 3.2.2 Touch Mode Charging.................................. 6 3.2.3 Interaction Between Prox and Touch Mode 7 3.2.4 Low Power Charging .................................... 7
6.3 SPI................................................................... 13 6.3.1 SPI read ...................................................... 14 6.3.2 SPI write ..................................................... 14 6.3.3 SPI Communications Window Terminate Command................................................................ 15
6.4 I2C ................................................................... 15
6.4.1 Control byte and Device Address............... 15
6.4.2 6.4.3 6.4.4
I2C read....................................................... 15 I2C write ..................................................... 15 I2C Communications Window Terminate
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 3.3.4 Prox Mode Channel Filters........................... 8 7.1 Absolute maximum specifications.................. 18
3.3.5 Environmental Drift ..................................... 8 7.2 Operating conditions (Measured at 25°C)...... 18 3.3.6 LTA Filter ...................................................... 8 3.3.7 Filter Halt ..................................................... 8 7.3 Moisture Sensitivity Level ............................... 18
3.3.8 Touch Sensitivity (Touch Mode channels 7.4 Timing characteristics (Measured at 25°C) .... 19 only) 9
3.3.9 Proximity Sensitivity (Prox and Touch Mode 8 Mechanical Dimensions ........................................20
channels)........................................................