1570W Power Supply Intel® Server System S7000FC4UR
Revision 1.0
88
10.2.7 Current Sharing
Outputs of two (or more) supplies connected in parallel must meet the regulation requirements
of a single supply. Under normal operation with two (or more) supplies running in parallel the
following outputs must share load current.
If one of the supplies fails, the remaining supply (supplies) must pick up the entire load without
any of the outputs dropping out of regulation. A defective supply that is connected to the output
voltage bus will have no adverse effect on the operation of the remaining functional supply
(supplies).
Table 26. Output Current Sharing
Output Level Output Sharing
+3.3V standby Not required
+12V Active
10.2.8 I
2
C Devices
All I
2
C devices will be powered from the cathode side of the +3.3V standby OR’ing diode. This
will allow the status and FRU data to be read from a power supply that is not powered on or has
some other fault. Protection is provided so if a fault within the power supply occurs it does not
take down the +3.3V standby bus.
Address locations will be determined by external settings through P1, pin A5. The A1 and A2
address will be wired high on the power supply. (NE1617A* does not have an A2 address). The
alert signal from (only) the I/O port will be through P1, pin D5.
10.2.8.1 FRU Data
The power supply contains a serial EEPROM. The address will be either AC or AE depending
on address bit A0.
10.2.8.2 Temperature Sensors
A temperature sensor, Philips* NE1617A or equivalent, will be located near the air inlet of the
supply. The address will be either 34 or 9C depending on address bit A0.
The second sensor location will be next to the exhaust outlet.
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