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As we all know, during initial phase of
design-in, various problems are encountered
and one of these could be false touch or no
touch activation of your system touch
function; and in order to assist you with
quick diagnosis and solution, PenMount
purposefully had an LED designed into its
controllers. This built-in LED helps the
system designer in analyzing where problem
is coming from, whether the problem is
between the controller and touch screen or
the controller and the PC system. If you
plan to design PenMount touch controller
circuitry into your system, we recommend you
to keep this LED design before your product
enters mass production stage. It will assist
your engineers to find out some design bugs,
verifying design problems and analyzing
phenomenon.
Upon connecting PenMount control board to
touch screen and DC power ( +5V or others;
please refer to each control board
specification ), the LED will light up when
the touch screen is touched; the LED will
not illuminate if there is no touch
activation, no matter if the control board
is connected to the interface cable ( USB /
RS-232 ) or not. If the LED does not light
up when touching the touch screen, possible
causes could be:
1. The power is not well-connected or voltage is not
enough ( DC 5V is suggested ).
2. The cable between touch screen and control board is
not well-connected.
3. The polarity of LED soldered onto the PCB.
If the LED is always alight, this could be
any of the following causes:
1. The front bezel of the display is pressed to the
active area of touch screen.
2. The pin assignment of touch screen and the control
board cable is incorrectly connected.
3. The touch screen may have been installed inversely;
the top front side facing down thus causing
the active area
of the touch screen being
unduly pressed.
Once there is false touch or no touch
activation, this LED will help engineer to
analyze where the problem is from hardware
circuit design, or software or wrong
installation. This is the reason we
recommend to keep this LED design before
product entering mass production stage. In
addition, if you would like to wake up the
system by touch screen from suspend or sleep
mode, you can monitor the voltage change of
LED component when the touch screen is
touched, as long as the power is supplied to
PenMount controller circuit. No matter what
the definitions and configurations of the
operating system and BIOS, touch screen will
wake up the system if the power is supplied
to PenMount controller.
If you use PenMount touch control board,
there are suitable accessories for your
selection. These accessories include:
1. 4 or 5 or 8 wire touch screen extension
cable; cables with AMP connector, Berg
connector or ZIF termination.
2. RS-232 or USB interface cable.
3. Stylus Pen.
4. Driver CD.
Selecting PenMount touch controller is your
best choice to meet your touch requirements.
All detailed configuration information can
be found in the PenMount Windows Driver
User’s Guide. For more PenMount controllers
and drivers information, please visit our
websites:
www.salt.com.tw and www.penmount.com.
Please feel free to contact us at our email
address
salt@salt.com.tw or service@penmount.com
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