Power Supply Specification Guidelines Intel® Server Board S2600CW Family TPS
148 Revision 2.4
10.3.4 PWOK (Power OK) Signal
The PDB connects the PWOK signals from the power supply modules and the DC/DC
converters to a common PWOK signal. This common PWOK signal connects to the PWOK pin
on P1. The DC/DC convert PWOK signals have open collector outputs.
10.3.4.1 System PWOK Requirements
The system will connect the PWOK signal to 3.3V or 5V by a pull-up resistor. The maximum
sink current of the power supplies are 0.5mA. The minimum resistance of the pull-up resistor
is stated below depending upon the motherboard’s pull-up voltage. Refer to the CRPS Power
Supply Specification for signal details.
Table 86. System PWOK Requirements
Motherboard Pull-up Voltage
MIN Resistance Value (ohms)
10.3.5 PSON Signal
The PDB connects the power supplies PSON signals together and connect them to the PSON
signal on P1. Refer to the CRPS Power Supply Specification for signal details.
10.3.6 PMBus*
The PDB has no components on it to support PMBus*. It only needs to connect the power
supply PMBus* signals (clock, data, SMBAlert#) and pass them to the 1x5 signal connector.
10.3.6.1 Addressing
The PDB addresses the power supply as follows on the PDB: 0 = open, 1 = grounded.
PDB addressing Address0/Address1
Power supply PMBus* device address
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