Azoteq ProxSense Series User manual

ProxSense®Series
Copyright © Azoteq 2013
IQS229EV03 User guide (quick-start)
v1.1
For more information
visit www.azoteq.com
IQS229EV03 User guide (quick-start)
Single Channel Capacitive Proximity/Touch Controller for SAR Applications
Introduction
The IQS229EV03 Evaluation kit features the
IQS229EV01 module PCB. This kit enables
the evaluation of the user interface as well as
the effect of the 4 resistor strap options:
2x Inputs are used to set the
activation threshold,
1x for the movement sensitivity and
1x for choosing a no-movement time-
out timer.
The IQS229 will work in standalone mode
(direct outputs) or streaming mode for
evaluation with a GUI using an Azoteq USB
streaming device (CT210).
The outputs may be interpreted as follows:
“ACTIVATION” →normal crossing of the
threshold
“MOVEMENT” → a pulse for every
movement detected.
First time power-up
When powering up for the first time, be sure
that the “STANDALONE” option is selected
by fitting a jumper onto the middle and lower
pins.
Switching the power should cause a blip on
the “POWER ON” LED. This is done so that
the evaluation kit may be left on for long
periods without draining the battery.
While holding the kit with the one hand, bring
the other closer to the “SENSING
ELECTRODE”. The user will be able to get
an idea of the movement response and
activation threshold.
By placing the electrode on a static object, an
“ACTIVATION” will be triggered, but it will
automatically clear after a no-movement
timeout.
By continually handling the device while in
ACTIVATION, the trigger will always remain
active.
Next is to familiarize oneself with the
“EXTERNAL STRAP OPTIONS” table on the
front of the kit.
External strap options
The external strap options are only read in
power-on and
reset events.
Strap High/Low or Float
When no jumper is placed, a floating input is
detected. Otherwise the input can be
strapped high or low by placing a jumper.
Figure 2 Strap LOW / Strap HIGH
Figure 1 IQS229EV03 front view

ProxSense®Series
Copyright © Azoteq 2013
IQS229EV03 User guide (quick-start)
v1.1
For more information
visit www.azoteq.com
Figure 3 Strap options
The table on the front shows that THR0 is
used for COARSE threshold shifts and THR1
is used for FINE threshold shifts.
The TIMEOUT TIMER will automatically clear
the ACTIVATION if no movement is present
for the selected timeout period.
The MOVEMENT THRESHOLD setting will
change the sensor sensitivity to movement
from most sensitive to least sensitive.
Analyse through streaming
The IQS229EV03 can be analysed through a
streaming protocol using a PC and the
Azoteq CT210 USB interface device.
To stream data to a PC, the following steps
are required:
Plug cable in “STREAMING HEADER”
Open the IQS229 GUI on the PC
Strap the “OUT PIN” HIGH
Set the ON/OFF switch to “OFF”
Press “Start” in the GUI
Figure 4 IQS229EV03 Rear view
Output Pins Functionality
The IQS229 features 2x direct outputs. These
can be used independently.
OUT pin
The OUT pin is active LOW with a pull-down
strap for failure safe output. If configured for
standalone mode, be sure not to pull this pin
high with a LED during start-up. Buffering or
an LED with a high forward voltage is
recommended.
The OUT pin toggles at power-on or reset to
indicate that the IC is working correctly.
See Figure 5 and Figure 6 for a comparison
of a normal threshold release compared to a
timeout threshold release. This effect may be
interpreted by a master device in order to be
aware of the type of release and to set
custom timers.
Figure 5 Normal threshold release
Figure 6 Timer time-out release
MOV_OUT pin
The MOV_OUT pin doubles as a movement
output and soft reset. By strapping this pin
low the IC will go into sleep mode. When
released, the IC will reset. When held low for
<15ms the activation will clear and the IC will
not reset. This is done by equalizing the
reference and current measurement.
OUT PIN: ACTIVATED DEACTIVATED