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ERP2U Power Supply Design Guide, V1.0
- 15 -
6.1.5 Optional Server Signal Connector
Connector housing: 5-pin Molex 50-57-9405 or equivalent
Contacts: Molex 16-02-0088 or equivalent (gold plated)
Notes:
It is recommended to use gold plated signal contacts on both the power supply connector and the baseboard
header.
If the optional server signal connector is not used on the power supply the 3.3VRS and ReturnS lines shall be
crimped into the contacts in the baseboard power connector.
If the server signal connector is unplugged, the power supply shall not shutdown or go into an over voltage
condition.
Table 10: Server Signal Connector
Pin Signal 24 AWG Color
1 I2C Clock White/Green Stripe
2 I2C Data White/Yellow Stripe
3 Reserved NA
4 ReturnS Black/White Stripe
5 3.3RS Orange/White Stripe
6.2 Grounding
STATUS
Required
The ground of the pins of the power assembly wire harness provides the power return path. The wire harness
ground pins shall be connected to safety ground (power supply enclosure).
6.3 Remote Sense
STATUS
Optional
The power assembly may have remote sense for the +3.3V (3.3VS) and return (ReturnS) if the Optional Server
Signal connector is implemented and the module has a +3.3V output. The remote sense return (ReturnS) is used
to regulate out ground drops for all output voltages. The +3.3V remote sense (3.3VS) is used to regulate out
drops in the system for the +3.3 V output. The remote sense input impedance to the power sub-assembly must
be greater than 200 ohms on 3.3 VS and ReturnS. This is the value of the resistor connecting the remote sense
to the output voltage internal to the power assembly. Remote sense must be able to regulate out a minimum of
200 mV drop on the +3.3 V output. The remote sense return (ReturnS) must be able to regulate out a minimum of
200 mV drop in the power ground return. The current in any remote sense line shall be less than 5 mA to prevent
voltage sensing errors. The power supply must operate within specification over the full range of voltage drops
from the power assembly’s output connector to the remote sense points.