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DATA SHEET
READ
The read protocol is the SMBus 1.1 Read Byte/Word protocol. Note that the read protocol may request a single byte or word.
S Address W A
Command
A
S Address R
1)
Optional
A
Data (Low) Byte A
Data High Byte 1) nA P
In addition, Block read commands are supported with a total maximum length of 255 bytes. See PFE Programming Manual
BCA.00006 for further information.
S Address W A
Command
A
S Address R
A
Byte Count
A
Byte 1
A
Byte N
nA P
8.18 GRAPHICAL USER INTERFACE
Power- One provides with its “Power -One I 2 C Utility” a Windows? XP/Vista/Win7 compatible graphical user interface allowing
the programming and monitoring of the PFE850 12 054xA Front-End. The utility can be downloaded on www.power-one.com
and supports both the PSMI and PMBus? protocols.
The GUI allows automatic discovery of the units connected to the communication bus and will show them in the navigation
tree. In the monitoring view the power supply can be controlled and monitored.
If the GUI is used in conjunction with the PFE850 12 054xA Evaluation Kit it is also possible to control the PSON_L pin(s) of
the power supply.
Further there is a button to disable the internal fan for approximately 10 seconds. This allows the user to take input power
measurements without fan consumptions to check efficiency compliance to the Climate Saver Computing Platinum specifica-
tion.
The monitoring screen also allows to enable the hot-standby mode on the power supply. The mode status is monitored and
by changing the load current it can be monitored when the power supply is being disabled for further energy savings. This
obviously requires 2 power supplies being operated as a redundant system (like the evaluation kit).
NOTE: The user of the GUI needs to ensure that only one of the power supplies have the hot-standby mode enabled.
Figure 37 - Monitoring dialog of the I 2 C Utility
BCD.00040_AG Sep-11-2013
17
www.power-one.com
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