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Theory of Operation Teledyne API – Model T300/T300M CO Analyzer
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13.4.8. FRONT PANEL TOUCHSCREEN/DISPLAY INTERFACE
Users can input data and receive information directly through the front panel
touchscreen display. The LCD display is controlled directly by the CPU board. The
touchscreen is interfaced to the CPU by means of a touchscreen controller that connects
to the CPU via the internal USB bus and emulates a computer mouse.
Figure 13-17: Front Panel and Display Interface Block Diagram
13.4.8.1. LVDS TRANSMITTER BOARD
The LVDS (low voltage differential signaling) transmitter board converts the parallel
display bus to a serialized, low voltage, differential signal bus in order to transmit the
video signal to the LCD interface PCA.
13.4.8.2. FRONT PANEL TOUCHSCREEN/DISPLAY INTERFACE PCA
The front
panel touchscree
n/display interface PCA controls the various functions of the
display and touchscreen. For driving the display it provides connection between the
CPU video controller and the LCD display module. This PCA also contains:
power supply circuitry for the LCD display module
a USB hub that is used for communications with the touchscreen controller and
the two front panel USB device ports
the circuitry for powering the display backlight
06864B DCN6314