Cradlepoint COR IBR600 - Power Management

White Paper / COR IBR600 Vehicle Installation Guide
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4
Battery
Ignition Switch
M
+
-
Power Manager
Fig 1. Battery Voltage During Engine Start
POWER MANAGEMENT
These devices monitor the state of the battery
and other lines such as the ignition switch to
determine if power should be applied to the
mobile device. Possible features provided by
these may include the following:
+ Provides power only when ignition
switch is turned on.
+ Monitors the battery voltage. If the
battery voltage is too low or too high,
power to the mobile device is not allowed.
+ Monitors whether the starter motor is
engaged. Does not apply power to the
mobile device while engaged.
+ May allow the device to remain powered
on for a specied time after the ignition is
switched o to prevent battery drain. This
time is typically user programmable.
The graph in Figure 1 shows how the voltage
available from the battery is reduced signicantly
when the starter motor is engaged. The voltage
may fall well below the recommended minimum
voltage required by the router causing “brown
out” conditions and possible malfunction.