Touchscreen User Manual – Issue 1
Zytronic X-Y Controller (Serial and USB)
13
WARNING:
Industry standard Anti Static procedures for electronic equipment must be
followed when handling the touchscreen sensor and controller PCB’s during all
stages of unpacking and installation of the product to prevent damage to the
product due to high levels of ESD. All integration should be carried out with the
equipment power switched OFF.
2.2.1 Controller PCB Card step-by-step Integration
¾
The controller PCB card is designed to be integrated into the rear of the LCD panel housing
which the touchscreen sensor is used in conjunction with.
¾
When selecting a place for the controller to be integrated within the rear of the LCD panel
housing please ensure the following:
o
The controller PCB card is located as far away as possible from sources of noise (i.e.
transformers, AC sources, motors, backlight inverters, etc) to minimise EMI
interference with the controller PCB card and its operation.
o
Ensure that all cables used to connect to the controller and that are used within the
system are shielded.
o
The controller needs to be connected to chassis ground of the system via its four
corner mounting holes.
o
The sensor is connected to the controller PCB card via the on board 34-way ZIF
connected located on the opposite edge to the Serial and USB connection ports. The
integrator needs to ensure this connector is accessible to allow the sensor flexi tail to
be easily connected to the PCB without the need for folding or bending of the sensor
flexi tail.
¾
To mount the controller the integrator will need four M3 screws and four compression/star
washers to connect to the four controller corner location holes to the chassis of the LCD back
plate. Ensure the screws and washers selected do not touch or short out with the near by
components located next to each of the four controller PCB corner mounting holes.
¾
The controller
MUST
be spaced of the rear metal back plate of the LCD panel by using four
metal stand off posts. These stand off posts need to space the controller card off any metal
back plate in all four corners by at least 5mm.
¾
Locate the controller in its desired mounting position using the four stand off posts. Use the
four M3 screws and washers to connect the four PCB corner mounting holes to the LCD metal
back plate, as shown in Figure 7. Take care not to short out any of the on board components
near the mounting holes and ensure the PCB controller card is not shorted out on the LCD
back plate.
¾
If in some integration scenarios there is no metal back plate to ground the controller to chassis
ground then an external flying grounded braid lead must be used to connect at least one of the
Controller PCB mounting holes to the nearest chassis ground potential, as shown in Figure 8.
Ensure that the flying grounding lead is kept as short as possible.
¾
A good chassis ground connection to the controller is important to establish stable operation.