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TIP-4735SEE-1 Datasheet(PDF) 5 Page - Vishay Siliconix |
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TIP-4735SEE-1 Datasheet(HTML) 5 Page - Vishay Siliconix |
5 / 7 page Document Number: 37078 For technical questions, contact: displays@vishay.com www.vishay.com Revision: 14-Jan-10 5 TIP-4735SEE-1 14" Infrared Touch Panel 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 TOUCH PANEL ACTION Send 22 Send 2B Enables enter point mode Request report Send 48 No report is available Send 2B Request report Send 42, 1D, 12 A stylus entered the touch panel. The coordinates are X29, and Y18 (decimal) (See touch point format) Send 2B Request report Send 48 No report is available |
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