IEI Technology TANK-700-QM67W-MRAY, User Manual

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TANK-700-QM67W-MRAY Em b e d d e d S ys te m
P a g e 38
high . The user can choose AT power mode or ATX power mode to control the system.
The following flow diagrams show the boot-up process and the LED status in AT and ATX
power modes.
Figure 3-30: ACC On: AT Mode
Figure 3-31: ACC On: ATX Mode
3.9.1.2 S witc h to Ba c ku p P o we r
During operation, system power will switch from Power 1 to Power 2 automatically when
the following situations occur:

Power 1 < 9V and Power 2 > 10.5V

Power 1 > 9V, but the ACC ON signal jumps from high to low

Power 1 is unplugged and Power 2 > 10.5V
The following flow diagram shows how the power is switched between Power 1 and
Power 2 and their LED statuses.
Figure 3-32: ACC On: Switch Between PWR1 and PWR2