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Teledyne API - T100 UV Fluorescence SO2 Analyzer Principles of Operation
313
13.6. FRONT PANEL/DISPLAY INTERFACE
Users can input data and receive information directly through the front panel touch-
screen 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.
CPU
LCD Display
and
Touchscreen
TFT BIAS
Supply
10.4, -7.0, 16, 4V
3.3V
Touch Screen Controller
USB2 HUB
USB & 5V
USB-1 USB-2
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LVDS
Receiver
LVDS
Transmitter
Board
USB Master
Back-Light
Supply
18 Bit TTL Data
+5V
BL Cont.
PWM
LAN COM4 USB4
Aux I/O PCA
Ethernet
USB Slave
Front Panel Interface PCA
Utility
Controller
Lang.
Remote
Local
Ethernet Port
USB
Type B Port
Analog Input
Terminal Block
Figure 13-23: Front Panel and Display Interface Block Diagram
13.6.1. 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.
13.6.2. FRONT PANEL INTERFACE PCA
The front panel 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
06807C DCN6650