TIP-5038SDE-1_10 Datasheet, PDF (5/7 Pages) Vishay Siliconix – 15" Infrared Touch Panel

15" Infrared Touch Panel
TIP-5038SDE-1
Vishay Dale
Normal X ⁽¹⁾ (36)
Invert X (37)
Normal Y ⁽¹⁾ (38)
Invert Y (39)
The standard configuration for the touch panel places the
XY origin at the lower left corner, consistent with the
Cartesian coordinate system. Upon issuing the invert Y
command, the origin becomes the upper left corner,
consistent with the video industry standard. These
commands allow the user to move the origin to any corner
to accomodate different standards or third party mechanical
packages which may have the touch panel rotated 180° on
the display. To cancel an invert X or invert Y command, a
normal X or normal Y command must be executed. These
commands may also be implemented with jumpers. Placing
a shunt on NOR X causes X data to be normal (default), and
removing the shunt causes inverted X data. Similarly,
placing a shunt on NOR Y causes Y data to be normal
(default), or removal causes inverted Y data. The jumper
selected options may be over-ridden with the software
commands.
Failed beam time-out (3A t)
If any IR beam is broken for an extended time due to
blockage of the beam or failed optical components, the
touch panel will ignore that beam after a predetermined
number of scans. (This is to prevent failed beams from
interfering with touch sensing). The actual failed beam
detection time depends on the modes of operation and the
size of the touch matrix. When using the continuous mode
with automatic reporting enabled, the time is typically 25 s
to 30 s. If the application requires longer touch times, then
the time may be extended using the failed beam time-out
command. The command accepts arguments from 1 to F.
Request failed beam report (28)
This command returns the address of any infrared diode/
phototransistor pair that are blocked (as when a stylus is in
the panel) or have several failed scans. (The time period can
be extended by using the failed beam time-out command).
The report uses the following format:
47 = start of failed beam report
aa-nn = physical address of failed LED/phototransistor pair
FF = end of report
Reset touch panel (2C)
After issuing the reset command, the touch panel is returned
to its power up condition and all operating modes are
returned to their default state and the buffer cleared.
Request software revision number (30)
Request touch matrix size (33)
Request model number (35)
These commands are provided for configuration control and
diagnostic purposes.
RS-232 framing or overrun error (45)
An RS-232 error indicates communication problems.
Buffer overflow error (4F)
Buffer overflow occurs when the input command buffer is
exceeded due to lack of handshaking.
INITIALIZATION
Initialization is performed by the host computer and must be
done each time the touch panel is powered up or the reset
touch panel command is issued. The initialization process
requires setting the desired coordinate reporting modes,
enabling or disabling automatic reporting, and enabling or
disabling the touch panel. Default settings are shown in the
commands table.
When touch coordinate information is required by the host
computer, the touch panel must be enabled. The flow of
touch coordinates from the touch panel to the host
computer can be controlled by enabling or disabling
automatic reporting. With automatic reporting enabled,
coordinate reports are sent to the host as soon as they
become available. If the host computer is performing a task
which does not require touch coordinate information,
automatic reporting may be disabled.
INITIALIZATION/OPERATION-EXAMPLE
In the following example the touch panel is initialized to
report coordinates only when a stylus is entered into the
touch panel.
The touch panel is enabled by default, and coordinate
reporting is not desired unless requested, so automatic
reporting is left disabled by default.
As a result the touch panel must be continuously polled with
request one coordinate report (2B) to determine if an enter
point coordinate report is available. When a report is
available, it will be sent to the host. If no report is available,
the touch panel will send code 48 (hex) to the host.
HOST
Send 22
Send 2B
Send 2B
Send 2B
TOUCH PANEL
Send 48
Send 42, 1D, 12
Send 48
ACTION
Enables enter point mode
Request report
No report is available
Request report
A stylus entered the touch
panel. The coordinates are
X29, and Y18 (decimal)
(See touch point format)
Request report
No report is available
Document Number: 37072
Revision: 14-Jan-10
For technical questions, contact: [e-mail]
www.vishay.com
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