4535 611 98931 iE33 Service Manual Page 73
CSIP Level 1 Theory of Operation: Physical Structure
in a suspend state, the system will boot much quicker as it is restoring the previous operating
system state saved in RAM. Typical boot times are greater than two minutes for a cold boot and
less than 35 seconds for a resume from standby.
The ACQ_DC_OK_n signal line in Figure 4-2 indicates the operating condition of the Acquisi-
tion Power Supply and allows for correct operation of the Platform Power Supply if the Acquisi-
tion Power Supply is not inserted or is inserted and functioning correctly. It also prevents a
false-good indication if the Acquisition Power Supply fails, including conditions where the input
fuses blow.
The DC_OK_OUT signal line is a reset signal to the system. It is dependent on the power state
of the Acquisition Power Supply and the Platform Power Supply.
A fully-charged system battery should maintain the system in the standby state for approximately
four hours without the system being plugged in. If the battery has been fully discharged, the sys-
tem may not boot up until the system has been plugged in for up to 20 minutes to get a sufficient
charge on the battery.
The system battery is charging when:
• The system is powered up and in use
• The system is shutdown, the circuit breaker is on, and the power cord is connected to a
power outlet
• The system is in standby, circuit breaker is on, and the power cord is connected to a power
outlet. (During this state, standby is maintained by current from the power outlet, not the
battery.)
The system battery is being discharged when the system is in standby and if the circuit breaker is
off, or if the power cord is not connected to a power outlet
The Universal Serial Bus (USB) is powered by the system battery, even when the system is off.
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