DriveCam DC3 - Page 21

DRC 242-A 2007-08-03 Page 21 DC3 with SEM Installation Instructions
Control
Yellow Wire
Blue Wire
Black Wire
(Always Connected to Ground)
1,800 Ohms
1/2 Watt
UM05
Ground
+12V
Input GPS
F
IGURE 2 UM05 TO 12V GPS INPUT
If the GPS or other device requires a voltage other than the normal vehicle voltage (i.e. a +5V level) and
that voltage is available at the GPS, simply connect the yellow wire to the voltage source.
Control
Yellow Wire
Blue Wire
Black Wire
(Always Connected to Ground)
1,800 Ohms
1/2 Watt
UM05
Ground
Input GPS
+5V
F
IGURE 3 GPS REQUIRING SPECIAL VOLTAGE
For applications like those shown in example 1, it is important to realize that the ability to supply current
from the blue (output) wire to a device is limited. How much current can be drawn from the wire is
dependent on the voltage necessary at the wire. Figure 4 shows the relationship of voltage at the blue
(output) wire vs. current being drawn for 12 Volts and 5 Volts at the yellow (supply) wire. Normally,
devices like GPS and other electronic devices with signal inputs require very little current so the voltage
supplied to them by the blue wire will be very close to the voltage supplied to the yellow wire.