IQS231 Datasheet, PDF (7/37 Pages) List of Unclassifed Manufacturers – Single Channel Capacitive Proximity/Touch Controller for SAR applications

ProxSense^® Series
4 Summary: Features
Pin
Many older designs using the IQS128 will benefit from a “drop-in”
compatibility ^{replacement on a production device for evaluation.}
DYCAL / Quick release
A DYCAL-type implementation (referring to dynamic threshold
calibration) is recommended as main stability feature for the
latest SAR user interface. Passing the device SAR qualification
with this type of interface has been proven successful.
“Quick release” detection is the improved “DYCAL”-type
implementation and focusses on a release characteristic within a
time window.
Movement features add a second level of protection against stuck
conditions with the quick release detection.
The quick release will be detected on the proximity channel (not
the secondary movement channel) and the signal slope will be
monitored to enable the quick release. A single action from a
touch/proximity state will trigger the quick release event and the
event will only remain as long the proximity state holds.
The device offers 3 main UIs intended for SAR use. These are:
 Proximity UI, no continuous movement sensing
 Proximity UI, continuous movement sensing
UI
 Proximity & touch UI, continuous movement sensing
during proximity, no movement sensing during touch (No
time-out during long duration stationary SAR tests)
User interface selection
In all cases the use of the quick release feature is recommended
to prevent typical non-human activations from remaining.
In all cases “no movement” and “movement sensing” refers to the
capacitive movement sensing during normal activation. “Hand held
detection” and “quick release” features will enable movement
sensing with a no-movement time-out, irrespective of which UI is
selected.
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IQS231 Datasheet v1.3
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Page 7 of 37
November 2015