IQS128 Datasheet, PDF (2/33 Pages) List of Unclassifed Manufacturers – Single Channel Capacitive Proximity, Touch Controller

IQ Switch^® ProxSense^® Series
Contents
1 OVERVIEW ......................................................................................................................................................... 4
1.1 DEVICE VARIATIONS ................................................................................................................................................ 4
1.2 DEVICE................................................................................................................................................................. 4
1.3 OPERATION........................................................................................................................................................... 4
1.4 APPLICABILITY........................................................................................................................................................ 4
2 PIN-OUT ............................................................................................................................................................. 5
2.1 IQS128 ............................................................................................................................................................... 5
2.1.1 Pin-out........................................................................................................................................................... 5
2.1.2 Schematic...................................................................................................................................................... 5
2.1.3 Typical values ................................................................................................................................................ 5
2.2 IQS128L ............................................................................................................................................................. 6
2.2.1 Pin-out........................................................................................................................................................... 6
2.2.2 Schematic...................................................................................................................................................... 6
2.2.1 Typical values ................................................................................................................................................ 6
3 USER CONFIGURABLE OPTIONS.......................................................................................................................... 7
3.1 CONFIGURING DEVICES ........................................................................................................................................... 7
3.1.1 IQS128 User Selectable Options .................................................................................................................... 7
3.1.2 IQS128L User Selectable Options .................................................................................................................. 9
4 MEASURING CAPACITANCE USING THE CHARGE TRANSFER METHOD...............................................................11
5 DYCAL™.............................................................................................................................................................12
5.1 OPERATING PRINCIPLE .......................................................................................................................................... 13
5.2 NON-TOUCH MODE ............................................................................................................................................. 13
5.3 TOUCH MODE ..................................................................................................................................................... 13
6 CONFIGURABLE SETTINGS .................................................................................................................................14
6.1 EXT_CTRL: EXTERNAL CONTROL............................................................................................................................ 14
6.1.1 Charge Halt ................................................................................................................................................. 14
6.1.2 Halt LTA filter .............................................................................................................................................. 14
6.1.3 Pulse on CTRL: ............................................................................................................................................. 14
6.2 LOGIC............................................................................................................................................................... 15
6.3 RF NOISE ON IQS128/IQS128L............................................................................................................................ 15
6.3.1 ND: RF Noise Detection (IQS128) ................................................................................................................ 15
6.3.2 IQS128/IQS128L RF Noise Immunity ........................................................................................................... 15
6.4 P_THR[1:0] PROXIMITY THRESHOLD ............................................................................................................................. 15
6.5 T_THR[2:0]TOUCH THRESHOLD ................................................................................................................................... 16
6.6 CTRL_DIRECTION ............................................................................................................................................. 16
6.7 T_HALT[1:0] FILTER HALT ........................................................................................................................................... 17
6.8 LP_[1:0] LOW POWER MODES (IQS128L) .................................................................................................................. 17
7 STREAMING MODE............................................................................................................................................18
8 AUTOMATIC TUNING IMPLEMENTATION (ATI)..................................................................................................19
8.1 ATI ................................................................................................................................................................... 19
8.1.1 ATI Target.................................................................................................................................................... 19
8.1.2 ATI_BASE: Significance of ATI Base .................................................................................................................. 19
8.2 SENSITIVITY DUE TO ATI ........................................................................................................................................ 20
8.3 ATI PROCEDURE .................................................................................................................................................. 20
9 DYCAL SPECIFIC SETTINGS .................................................................................................................................21
9.1 REL_T_THR: RELEASE THRESHOLD (IQS128L)............................................................................................................ 21
9.2 DYCAL_OUTPUT (IQS128L) ............................................................................................................................. 21
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All Rights Reserved
IQS128 & IQS128LP Datasheet v2.4
Page 2 of 33
November 2012