Supplying Power To The Controller - 3M Touch Screen Controller EX112 Reference Manual

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The controller should be mounted in line with the sensor flex tail exit point to minimize
flexing. Refer to Figure 1 for more details on controller mounting.

Supplying Power to the Controller

You must supply the EX serial controller with power. You can use internal power (that is,
tap power from inside the display or PC) or external power.
However you supply power, the source must deliver 85 mA typical (110 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
appendices.
 (EX112 only) Internal power +5V to +12 V DC through the 2-pin power input
connector pin 2 (+5V to 12 V) and pin 1 (RTN). 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.
Note: To avoid possible damage to one or both of the power supplies, do not supply
both internal power and external power to the controller. Power from two sources could
cause damage.
Using an Internal Power Supply (+5V to +12V) to JP3
Provide power directly to the controller using JP3 (Molex 22-05-3021). Use a mating 2-
pin connector and connect Pin 2 to power (between +5V and +12V) and Pin 1 to the
return. (Mating connector is the Molex housing 22-01-3027 with 08-50-0114 contacts).
Using a Custom Serial Cable Design
When creating a custom serial cable connection, you can provide power to the controller
through the mating Molex connector: (refer to Table 12 for more information on actual
cable connections).
1. Obtain a 7-pin Molex connector 51004-0700.
2. Attach power and ground to the connector, (Pin 6: +5V to +12V, Pin 7: Ground).
Using an External Wall-Mount Power Supply
If you are using a standard 3M™ MicroTouch™ RS-232 serial cable (P/N 7310101),
consult your applications engineer for power supply specifications.
3M Touch Systems, Inc. Proprietary Information -- 29087v03
3M™ MicroTouch™ Controller EX Serial Reference Guide