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PAC2000S12-B1 PSU
Table 9-18 EFUSEV signal characteristics
Signal Characteristics
Signal type
EFUSEV = High
EFUSEV = Low
Table 9-19 EFUSEV output
EFUSEV Output
Low level voltage
High level voltage
9.14 SMART_ON#
The SMART_ON signal is used to wake up a cold-standby PSU (low level by default).
1.
Active PSU setting: The system sends the D0h 0x01 command to the active PSU, the
SMART_ON signal of the active PSU changes to high level, and then the PSU enters cold
standby mode.
2.
Standby PSU setting: The system sends the D0h 0x02/0x03/0x04 command to the standby PSU,
and then the standby PSU disconnects the DC/DC circuit.
3.
Standby PSU wake-up: If the active PSU is faulty and the SMART_ON signal changes to low
level, the standby PSU starts working.
NO TE
Other PSUs must work properly when different models of PSUs are inserted.
Table 9-20 SMART_ON# signal characteristics
Signal Characteristics
Signal type: Cold-standby PSU wake-
up signal
Technical Manual
PSU side: Sent to the PSU DSP by a 100-ohm series resistor.
System side:
● If this function is enabled, the system sends the voltage analog signal
of the main service circuit to the PSU, or CPLD outputs this signal over
the drive circuit and this signal is pulled up to 3.3 V level by a 4.7-
kilohm resistor.
● If this function is disabled, this signal is pulled up to 3.3 V level by a
4.7-kilohm resistor.
Disables deep sleep and automatic PFC shutdown.
Enables deep sleep and automatic PFC shutdown.
Minimum
0 V
1.000 V
The SMART_ON# signals of all PSUs are connected
together.
9 Control Functions
Maximum
0.8 V
3.465 V
42
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