IQS213 Datasheet, PDF(21/46 Page) List of Unclassifed Manufacturers – 3-Channel Capacitive Touch/Swipe Function Controller

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IQS213 Datasheet, PDF (21/46 Pages) List of Unclassifed Manufacturers – 3-Channel Capacitive Touch/Swipe Function Controller

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IQ SwitchÂ®

ProxSenseÂ® Series

Table 6.1 : Low Power Mode Timing (tLP)

Power Mode

tSAMPLE

(Stand-alone)

tSAMPLE

(I2C )

NP (Default)

2.6 ms

3.9ms

LP1

128 ms

128ms

LP2

256 ms

256ms

LP3

512 ms

512ms

Figure 6.3 : LP Modes â Charge Cycles

6.7 Proximity Threshold

The IQS213A has 2 proximity threshold (PTH)

settings. The proximity threshold is selected by

the designer to obtain the desired sensitivity

and noise immunity. The proximity event is

triggered based on the selected proximity

threshold, which is either 3 or 8 counts.

(For IQS213, PTH is calculated by dividing the

selected touch threshold value of channel 1

(CH1TTH) with the value corresponding to the

PROXDIV bit (i.e. either 2 or 4). The proximity

threshold is expressed in terms of counts, the

same as the CS value)

For proximity events, the difference between

the LTA and CS (in counts) of the proximity

channel should be greater than PTH for at least

4 consecutive samples, unless the CS delta is

greater than the touch threshold of any active

channel. (See Section 8.8)

6.8 Touch Thresholds

The IQS213(A) has 8 touch threshold settings.

The touch threshold is selected by the

designer to obtain the desired touch sensitivity.

The touch event is triggered based on the

selected touch threshold, which is expressed

as a fraction of the LTA, given by:

. (See Section 8.8)

For a touch event, the difference between LTA

and CS (counts) of the touch channel should

be greater than the selected touch threshold

for at least 2 consecutive samples.

On the IQS213(A) device, the touch threshold

settings are grouped for channels 1 and 3

(CH1,3 TTH) and is separate for channel 2 (CH2

TTH).

The IQS213(A) device is by default setup

without the alternative threshold settings. The

alternative threshold values can be selected by

setting the TTH_ALT bit (i.e. bit3 in Bank1).

IQS213A (IQS213) Datasheet

Revision 2.1

Page 21 of 46

March 2014

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