User Manual

TANK-800 Embedded System
Page 42
3.9.1.1 Boot-up
When both power connectors are connected to power source with over 9 V power input,
the two power LEDs on the front panel remain off until the ACC ON signal jump from
low to high. The user can choose to use 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 3-33: ACC On: AT Mode
Figure 3-34: ACC On: ATX Mode
3.9.1.2 Switch to Backup Power
During the operation, the 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 jump 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.