2 switch to backup power, Figure 3-42: acc off: switch between pwr1 and pwr2 – IEI Integration TANK-700-QM67 v1.00 User Manual
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TANK-700 Embedded System
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3.11.2.2 Switch to Backup Power
During operation, system power switches from Power 2 to Power 1 automatically when the
following situations occur:
Power 2 < 10.5V and Power 1 > 9V
Power 2 is unplugged and Power 1 > 9V
The following flow diagram shows how the power is switched between Power 2 and
Power 1 and their LED statuses.
Figure 3-42: ACC Off: Switch Between PWR1 and PWR2
NOTE:
System power can switch between Power 2 and Power 1 automatically
when
a 12 V power adapter is being connected to Power 2 and the
power input of Power 1 is from 9 V to 16 V. If Power 2 is unplugged and
the power input of Power 1 is over 16 V, system power will switch to
Power 1 automatically. However, the system remains using the power
source from Power 1 even if Power 2 is re-plugged.
System power can switch between Power 2 and Power 1 automatically
when
a 19 V power adapter is being connected to Power 2 and the
power input of Power 1 is from 9 V to 26 V. If Power 2 is unplugged and
the power input of Power 1 is over 26 V, system power will switch to
Power 1 automatically. However, the system remains using the power
source from Power 1 even if Power 2 is re-plugged.