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Integrating the SC500 USB Controller
Mounting the Controller
The controller is designed for internal mounting only. Choose a convenient spot away
from high-voltage, high power cables and electronics. Use 4-40 metal screws to
mount the controller using the two diagonal mounting holes in the board. The
controller should be mounted in line with the touch screen cable exit point to
minimize cable flexing. The controller should be mounted internally behind or on the
side of the display on stand offs to allow room for the touch screen cable connector.
Ensure that the tail and controller are aligned such that the tail remains straight (90°),
not pulled or twisted in an odd angle from the touch screen. Good engineering design
avoids awkward electrical connections.
Supplying Power to the Controller
The SC500 USB controller is powered by the USB 5-volt bus power. The typical
current is 15 mA typical, 28 mA touching; ± 5% regulation, with a maximum ripple
and noise of 50mV peak-to-peak.
CAUTION
To avoid possible damage to the controller, you must provide a path for electrostatic
discharge (ESD). The controller mounting hole near the sensor connector should be used to
connect to chassis safety ground and must be attached by the shortest possible route to a good
earth return (chassis) in all applications.
3M Touch Systems Proprietary Information
11
Recommended:
Wrap tail smoothly
Not recommended:
Do not twist the tail
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