Project Files
|
Touch Panel and Display Interface
|
Printer Friendly Version ,
requires Acrobat
Reader
A client was developing a new generation of Blood Analysis
instrumentation. The equipment was based on an embedded PC
running Linux, and incorporated a variety of different
subsystems, not all of which had been specified. The client
was unsure of whether the Touch Panel should interface to
the host via USB or via RS-232, and wanted to implement both
interfaces to maintain as much flexibility as possible. |
 |
System
Overview
Bolton Engineering was hired to design a Touch Panel
controller to mount on the back of the system LCD. The
board also consolidated the LCD and backlight control
signals. To maintain the thinnest possible assembled
board thickness, all the components were mounted on one
circuit board side. In addition to the Touch Panel
control logic, the board also incorporated an LVDS (Low
Voltage Differential Signaling) serializer that
consolidated the twenty-two wire LCD interface onto
three LVDS pairs. Using LVDS not only simplified the
wiring to the processor board, it also greatly reduced
EMI because of the much smaller LVDS signal transitions
and the differential nature of the signaling.
To provide the greatest possible system flexibility,
both RS-232 and USB interfaces were incorporated. The
board ran off a single 3.3V supply.
Project Scope
Bolton Engineering wrote the specification, designed the
schematics, obtained vendor quotes, designed the 4-layer
circuit board, tested the system under Linux, and
delivered over fifty working prototypes.
|
| |
|
|
|
Consumer and Computer
