Touchscreen User Manual – Issue 1
Zytronic X-Y Controller (Serial and USB)
17
Figure 12:
Apply gasket to sharp areas of metal work that the flexi tail comes in contact with
2.3.2 Powering up the Touchscreen Controller PCB card
Table 1 specifies the required power requirements for both the Serial and USB controller PCB card
variants:
Parameter
Serial RS232 Controller
USB RS232 Controller
Voltage (V)
Powered from external
regulated power supply of
5V d.c. ± 5% (max)
Powered from USB VBUS of
5V d.c. ± 5% (max)
Current (mA)
100mA
100mA
Table 1:
Power requirements for Serial and USB Controller PCB cards
As can be seen from the above table, the Serial RS232 controller is required to be powered from a
regulated external power supply. The USB controller pulls its power from the USB VBUS supply.
The input voltage quality is critical to the operation of both variants.
Input voltage variations below
4.75v will cause product to not operate correctly
.
IMPORTANT:
A 5V d.c. ± 5% (max) Tolerance good regulated 100mA supply must be
used to power both Serial and USB controllers.
Touchscreen tail
At least 2.5mm between
tail and a surface that is
conductive
Do not bend tail
to a radius less
than 2.5mm
Use insulator to protect tail
wrapped around sharp edge