3M™ MicroTouch™ Controller EX Dual Mode Reference Guide
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3M Touch Systems, Inc. Proprietary Information – TSD-40848A
Figure 1 EX113 Touch Controller
Supplying Power to the Controller
You must supply the EX dual mode controller with power. You can use internal power
(that is, tap power from inside the display or PC) or external power.
Note:
Power must always be supplied to JP3. If a USB cable is connected, the controller
is in USB mode – otherwise it defaults to serial mode. Power for the controller is not
derived from Vbus.
However you supply power, the source must deliver 80 mA typical (100 mA maximum),
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. 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.
You can supply power to the controller using any of the following methods. The voltage
input can vary from +5VDC to +12VDC. Exact specifications can be found in the
appendix.
•
Internal power +5V to +12 V DC through the 2-pin power input connector (JP3). Pin
2 is +5V to 12 V and pin 1 is return. A square pin indicator on the bottom of the
board marks pin 1.
•
Internal power (+5V to +12V DC) through a custom serial cable configuration.
•
External power (+5 V DC) from a wall-mount power supply through the 3M Touch
Systems serial cable part 7310101.
