IQS128EV04 S Azoteq, IQS128EV04 S Datasheet - Page 13

• Manufacturer Part Number: IQS128EV04 S
• Description: Touch Sensor Development Tools Long range IQS128 proximity kit
• Manufacturer: Azoteq

Specifications of IQS128EV04 S

• Tool Is For Evaluation Of: IQS128
• Interface Type: LED
• Operating Voltage: 2.95 V to 5.5 V

®
®
IQ Switch
ProxSense
Series
5.1 Operating Principle
Figure 5.1 is a visual representation of the
DYCAL functionality. The OUT pin is used to
indicate the status of a DYCAL event (both a
proximity and a touch event). The DYCAL
functionality is summarised below.
5.2 Non-Touch Mode
The OUT pin is activated on the successful
detection of a proximity event and will remain
activated for the duration of the proximity
event, permitting that this event is not longer
than the filter halt timings. The LTA will be
halted in this time.
As soon as a touch condition is detected (CS
below T
), the controller will dynamically
THR
re-calibrate its LTA to the halted LTA – T
.
THR
The IC is now in Touch Mode.
5.3 Touch Mode
After the re-calibration of the LTA, it will
follow the CS and be allowed to track slow
varying environmental changes. If the CS
were to exceed the LTA by a release
threshold (REL_T
) the touch detection will
THR
stop and the OUT pin will return to its original
state.
Copyright © Azoteq (Pty) Ltd 2011
IQS128 & IQS128LP Datasheet v2.2
Page 13 of 33
All Rights Reserved
April 2013