LM8300-REF-01 National Semiconductor, LM8300-REF-01 Datasheet - Page 4

• Manufacturer Part Number: LM8300-REF-01
• Description: BOARD EVALUATION LM8300
• Manufacturer: National Semiconductor

Specifications of LM8300-REF-01

• Main Purpose: Interface, Touch Screen Controller
• Utilized Ic / Part: LM8300
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -

National TS Driver Software
Open up Windows Explorer and navigate to c:\touchscreen and locate Himalaya.exe. Lauch
the program by double clicking on Himalaya.exe. When running, an icon will appear in the
Windows’™ tray area.
To access the functions, right click on the Himalaya icon.
Adjust Settings Dialog Box
The Adjust Settings will launch the settings dialog box. The calibrate option will execute the
calibration procedure for the 5 point calibration. To exit the program, select close.
Communication Settings – The default setting for the TS driver is to communicate to the
evaluation board through COM1. If the setting of the COM port is changed, the PC must be
rebooted for the change to take effect.
Communication Mode – The default setting is stream mode. In this mode, the driver will
interpret all touches on the touch panel. The other modes are touchdown and liftoff. In the
touchdown mode, the driver will only receive data from the TSC when a touchdown is detected
on the panel. In the liftoff mode, the driver will only receive data from the TSC when a liftoff is
detected on the panel.
Samples per Coordinate – The default setting is 8 samples per coordinate. The other available
settings are 2, 4, 16, and 32 samples per coordinate. Keep in mind that higher settings might
cause the mouse pointer to trail the actual position of the touch.
Focus Value – The default setting is 4.
Max Delta – The default setting is 8.
Pressure (Z-Axis) Pressure Threshold – The default setting is 40. The pressure threshold is
used by the controller to determine how hard a touch must be on the panel before it is considered
valid. Be warned though, too high of a pressure threshold value might cause the corners of the
touch panel to not be registered by the TSC.
Pressure (Z-Axis) Use Pressure – When enabled, the TSC will send the pressure measurement
in addition to the X-Y coordinates. With the pressure measurement enabled, more data bytes are
sent from the TSC to the driver; thus the coordinate pairs per second (CPPS) will be lower.