Intel ERP2U manual Grounding, Remote Sense, Optional Server Signal Connector

SSI

ERP2U Power Supply Design Guide, V1.0

6.1.5Optional 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

6.2Grounding

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).

6.3Remote 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.

- 15 -