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8.16 PSMI PROTOCOL
New power management features in computer systems require the system to communicate with the power supply to access
current, voltage, fan speed, and temperature information. Current measurements provide data to the system for determining
potential system configuration limitations and provide actual system power consumption for facility planning. Temperature
and fan monitoring allow the system to better manage fan speeds and temperatures for optimizing system acoustics. Voltage
monitoring allows the system to calculate input wattage and warning of system voltage regulation problems. The Power Sup-
ply Management Interface (PSMI) supports diagnostic capabilities and allows managing of redundant power supplies. The
communication method is SMBus. The current design guideline is version 2.12.
The communication protocol is register based and defines a read and write communication protocol to read / write to a single
register address. All registers are accessed via the same basic command given below. No PEC (Packet Error Code) is used.
WRITE
The write protocol used is the SMBus 2.0 Write Word protocol. All writes are 16-bit words; byte reads are not supported nor
allowed. The shaded areas in the figure indicate bits and bytes written by the PSMI master device. See PFE Programming
Manual for further information.
S Address W A
Register ID
A
Data Low Byte
A
Data High Byte A
P
READ
The read protocol used is the SMBus 2.0 Read Word protocol. All reads are 16-bit words; byte reads are not supported nor
allowed. The shaded areas in the figure indicate bits and bytes written by the PSMI master device. See PFE Programming
Manual for further information.
S Address W A
Register ID
A
S Address R
A
Data Low Byte
A
Data High Byte nA P
8.17 PMBus? PROTOCOL
The Power Management Bus (PMBus?) is an open standard protocol that defines means of communicating with power
conversion and other devices. For more information, please see the System Management Interface Forum web site at :
PMBus? command codes are not register addresses. They describe a specific command to be executed. The
PFE1100-12-054xA supply supports the following basic command structures:
? Clock stretching limited to 1 ms
? SCL low time-out of >25 ms with recovery within 10 ms
? Recognized any time Start/Stop bus conditions
WRITE
The write protocol is the SMBus 1.1 Write Byte/Word protocol. Note that the write protocol may end after the command byte
or after the first data byte (Byte command) or then after sending 2 data bytes (Word command).
S Address W A
Command
A
Data Low Byte 1) A
1)
Optional
Data High Byte 1) A
P
In addition, Block write commands are supported with a total maximum length of 255 bytes. See PFE Programming Manual
for further information.
S Address W A
Command
A
Byte Count
A
PFE1100-12-054xA
Byte 1
A
16
Byte N
A
P
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