IQS227AS-00000000 TSR Azoteq

IQ Switch ProxSense Series Azoteq IQS227AS/B DATASHEET Single channel capacitive proximity and touch controller The IQS227AS/B ProxSense IC is a fully integrated Self Capacitive sensor with dual outputs (Touch and Proximity outputs). Features > Sub 2.5A in Low Power Mode while sensing Proximity > Automatic Tuning Implementation (ATI) - Automatic tuning of sense electrode > Internal Capacitor Implementation (ICI) reference capacitor on-chip > Supply voltage: 1.8V to 3.6V > Minimum external components > Data streaming option RoHS2 > Advanced on-chip digital signal processing Compliant > User selectable (OTP): 4 Power Modes IO sink / source Time-out for stuck key Output mode (Direct / Latch / Toggle) Proximity and Touch Button sensitivity Applications > LCD, Plasma & LED TVs > GSM cellular telephones On ear detection / touch keys > LED flashlights or headlamps > White goods and appliances > Office equipment, toys, sanitary ware > Flame proof, hazardous environment Human Interface Devices > Proximity detection enables backlighting activation > Wake-up from standby applications > Replacement for electromechanical switches > Find-In-The-Dark (FITD) applications > Automotive: Door pocket lighting, electric window control > GUI trigger on Proximity detected. Available options T TSOT23-6 WLCSP-8 DFN-6 A -20C to 85C IQS227AS - - -40C to 85C IQS227B IQS227B IQS227B Copyright Azoteq (Pty) Ltd 2021 IQS227AS/B Datasheet Page 1 of 37 All rights reserved Revision 1.40 October 2021 IQ Switch ProxSense Series Azoteq Contents IQS227AS/B DATASHEET ................................................................................................................................ 1 1 OVERVIEW ..................................................................................................................................................... 5 1.1 APPLICABILITY ............................................................................................................................................ 5 1.2 ANALOGUE FUNCTIONALITY ......................................................................................................................... 5 2 PACKAGING AND PIN-OUT .......................................................................................................................... 6 2.1 IQS227AS/B.............................................................................................................................................. 6 2.1.1 TSOT23-6 Pin-out ............................................................................................................................. 6 2.1.2 WLCSP-8 Pin-out .............................................................................................................................. 7 2.1.3 DFN-6 Pin-out ................................................................................................................................... 8 2.2 SCHEMATIC................................................................................................................................................. 9 2.2.1 TSOT23-6 .......................................................................................................................................... 9 2.2.2 WLCSP-8........................................................................................................................................... 9 2.2.3 DFN-6 .............................................................................................................................................. 10 3 USER CONFIGURABLE OPTIONS ............................................................................................................. 11 3.1 CONFIGURING OF DEVICES ........................................................................................................................ 11 4 MEASURING CAPACITANCE USING THE CHARGE TRANSFER METHOD .......................................... 14 5 DESCRIPTIONS OF USER OPTIONS ......................................................................................................... 14 5.1 PROXIMITY / TOUCH SENSOR ..................................................................................................................... 15 5.2 LOGIC SELECT FOR OUTPUTS ..................................................................................................................... 15 5.3 OUTPUT PIN FUNCTION .............................................................................................................................. 15 5.3.1 Output function: Active .................................................................................................................... 15 5.3.2 Output function: Latch (for t ) .................................................................................................... 15 LATCH 5.3.3 Output function: Toggle ................................................................................................................... 16 5.4 PROXIMITY THRESHOLD ............................................................................................................................ 16 5.5 TOUCH THRESHOLD .................................................................................................................................. 16 5.6 POWER MODES......................................................................................................................................... 17 5.7 BASE VALUES ........................................................................................................................................... 18 5.8 MULTIPLIERS ............................................................................................................................................ 18 5.9 CHARGE TRANSFER .................................................................................................................................. 18 5.10 ATI TARGET COUNTS .............................................................................................................................. 18 5.11 NOISE DETECT........................................................................................................................................ 18 5.12 ENABLE PARTIAL ATI .............................................................................................................................. 18 5.13 FILTERS USED BY THE IQS227AS/B ........................................................................................................ 18 5.13.1 Long Term Average (LTA) ............................................................................................................ 18 5.13.2 IIR Raw Data filter ......................................................................................................................... 19 6 DATA STREAMING MODE .......................................................................................................................... 19 6.1 EVENT MODE ............................................................................................................................................ 21 2 6.2 I C ........................................................................................................................................................... 21 7 AUTO TUNING IMPLEMENTATION (ATI) ................................................................................................... 21 7.1 AUTOMATIC ATI ........................................................................................................................................ 21 7.2 IQS227AS/B NOISE IMMUNITY .................................................................................................................. 22 8 ELECTRICAL SPECIFICATIONS ................................................................................................................ 23 8.1 ABSOLUTE MAXIMUM SPECIFICATIONS ....................................................................................................... 23 8.2 GENERAL CHARACTERISTICS ..................................................................................................................... 23 Copyright Azoteq (Pty) Ltd 2021 IQS227AS/B Datasheet Page 2 of 37 All rights reserved Revision 1.40 October 2021