IQS572 datasheet(2/80 Pages) ETC2

Part #	IQS572

Description	Capacitive Trackpad/Touchscreen Controller

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IQ Switch

®

ProxSense

® Series

IQS5xx-B000 Trackpad Datasheet

Page 2 of 80

Revision 1.1

October 2015

Contents

1

Overview............................................................................................................................................................ 7

2

Packaging and Pin-out ........................................................................................................................................ 8

2.1

IQS550 - QFN48 ................................................................................................................................................. 8

2.2

IQS572 - QFN28 ............................................................................................................................................... 10

2.3

IQS525 - QFN28 ............................................................................................................................................... 12

3

ProxSense

® Module ...........................................................................................................................................14

3.1

Channel Definition ........................................................................................................................................... 14

3.2

Alternate Low-Power Channel (ALP) .............................................................................................................. 14

3.3

Count Value ..................................................................................................................................................... 14

3.3.1

Trackpad Count Values ............................................................................................................................... 14

3.3.2

ALP Count Values ........................................................................................................................................ 14

3.3.3

Max Count................................................................................................................................................... 15

3.3.4

Delta Value.................................................................................................................................................. 15

3.4

Reference Value............................................................................................................................................... 15

3.4.1

Reference Update Time .............................................................................................................................. 15

3.4.2

ALP Long-Term Average.............................................................................................................................. 15

3.4.3

Reseed......................................................................................................................................................... 15

3.5

Channel Outputs.............................................................................................................................................. 15

3.5.1

Proximity ..................................................................................................................................................... 15

3.5.2

Touch .......................................................................................................................................................... 16

3.5.3

Snap ............................................................................................................................................................ 16

3.5.4

Output Debounce ....................................................................................................................................... 16

3.5.5

Maximum Touch ......................................................................................................................................... 16

3.6

Auto Tuning (ATI) ............................................................................................................................................ 17

3.6.1

ATI C Multiplier ........................................................................................................................................... 17

3.6.2

ATI Compensation & Auto ATI .................................................................................................................... 17

3.7

Automatic Re-ATI ............................................................................................................................................ 17

3.7.1

Description.................................................................................................................................................. 17

3.7.2

Conditions for Re-ATI to activate................................................................................................................ 17

3.7.3

ATI Error ...................................................................................................................................................... 18

3.7.4

Design requirements................................................................................................................................... 18

3.8

Sensing Hardware Settings.............................................................................................................................. 18

4

Sensing Modes ..................................................................................................................................................19

4.1

Report Rate ..................................................................................................................................................... 19

4.1.1

Previous Cycle Time .................................................................................................................................... 20

4.2

Mode Timeout ................................................................................................................................................. 20

4.3

Manual Control ............................................................................................................................................... 20

5

Trackpad ...........................................................................................................................................................20

5.1

Configuration................................................................................................................................................... 20

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