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IQS243 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers

Part # IQS243
Description  Sub 3uA current consumption
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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IQS243 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers

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ProxSense
® Series
Copyright © Azoteq 2014
IQS243 Datasheet v1.5
Page 4 of 30
All Rights Reserved
August 2014
Please refer to the Application Note Section
on the Azoteq website for more design tips
and
other
application
dependent
recommendations.
6 Adjustable Proximity
Threshold
The proximity threshold is selected by the
designer to obtain the desired proximity
sensitivity and is selectable between 1 (most
sensitive) to 254 (least sensitive). The IQS243
has a default proximity threshold (PTH) of 4 for
all channels. Proximity thresholds for the
sense electrodes are individually adjustable
between the specified limits.
A proximity event is identified when for at least
6 consecutive samples the following equation
holds:
PTH =< LTA-CS
Where LTA is the Long Term Average
7 Adjustable Touch
Thresholds
The touch threshold is selected by the
designer to obtain the desired touch sensitivity
and
is
selectable
between
1/255
(most
sensitive) to 254/255 (least sensitive). The
IQS243 has a default touch threshold (TTH) of
32/255
(for
all
3
channels).
The
touch
threshold is expressed as a fraction of the LTA
as follows:
TTH = Selected Touch Threshold x LTA
Where LTA is the Long Term Average
The touch event is triggered based on TTH, CS
and LTA. A touch event is identified when for
at least 2 consecutive samples the following
equation holds:
TTH =< LTA-CS
With lower average CS (therefore lower LTA)
values the touch threshold will be lower and
vice versa. Individual touch threshold can be
set for each channel.
8 Charge Transfers
The IQS243 samples in 4 timeslots. The
charge sequence is shown in Figure 8.1,
where CH0 is the Prox channel, which
charges before each of the 3 input channels.
CH0 is realised by connecting all three touch
electrodes with internal switches. Therefore:
CH0 is a distributed electrode formed by the 3
touch electrodes.
Proximity can be detected by the distributed
electrode (CRX0+CRX1+CRX2) AND each
individual sense electrode (CRX0, CRX1 and
CRX2).
9 I2C Communication
The IQS243 device interfaces to a master
controller via a 2 wire serial interface bus that
is I
2CTM compatible. An optional RDY pin is
available
to
indicate
the
communication
window (required for Event Mode).
The IQS243 has four available sub addresses,
44H (default) to 47H that is selected upon
purchase of the IC. The ADR0 pin can also be
pulled low to increase the I2C address by one
decimal value (for example from 44H to 45H).
The
maximum
I
2CTM
compatible
communication speed for the IQS243 is
400kbit/s.
Please refer to the IQS243 Communications
Interface and Sample Code Document for
further details.


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