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PMBus COMMAND DETAILS
ADDRESSING AND WRITE PROTECT
COMMAND NAME
PAGE
PAGE_PLUS_WRITE
PAGE_PLUS_READ
WRITE_PROTECT
MFR_ADDRESS
MFR_RAIL_ADDRESS
Related commands: MFR_COMMON.
PAGE
The PAGE command provides the ability to configure, control and monitor both PWM channels through only one
physical address, either the MFR_ADDRESS or GLOBAL device address. Each PAGE contains the operating memory
for one PWM channel.
Pages 0x00 and 0x01 correspond to Channel 0 and Channel 1, respectively, in this device.
Setting PAGE to 0xFF applies any following paged commands to both outputs. With PAGE set to 0xFF the LTC3882-1
will respond to read commands as if PAGE were set to 0x00 (Channel 0 results).
This command has one data byte.
PAGE_PLUS_WRITE
The PAGE_PLUS_WRITE command provides a way to set the page within a device, send a command and then send
the data for the command, all in one communication packet. Commands allowed by the present write protection level
may be sent with PAGE_PLUS_WRITE.
The value stored in the PAGE command is not affected by PAGE_PLUS_WRITE. If PAGE_PLUS_WRITE is used to send
a non-paged command, the Page Number byte is ignored.
This command uses Write Block protocol. An example of the PAGE_PLUS_WRITE command with PEC sending a com-
mand that has two data bytes is shown in Figure 49.
1
SLAVE
S
ADDRESS
(by functional groups)
CMD
CODE DESCRIPTION
0x00 Channel (page) presently selected for any
paged command.
0x05 Write a command directly to a specified page.
0x06 Read a command directly from a specified
page.
0x10 Protect the device against unintended PMBus
modifications.
0xE6 Specify right-justified 7-bit device address.
0xFA Specify unique right-justified 7-bit address
for channels comprising a PolyPhase output.
7
1
1
8
1
PAGE_PLUS
W A
A
COMMAND CODE
8
1
LOWER DATA
UPPER DATA
A
BYTE
Figure 49. Example of PAGE_PLUS_WRITE
For more information
TYPE
R/W Byte
W Block
Block R/W
Process
R/W Byte
R/W Byte
R/W Byte
8
1
8
BLOCK COUNT
PAGE
A
(= 4)
NUMBER
8
1
8
1
A
PEC BYTE
A
BYTE
38821 F49
www.analog.com
LTC3882-1
DATA
PAGED
FORMAT
UNITS NVM
N
Reg
N
N
N
Reg
l
N
Reg
l
Y
Reg
l
1
8
1
COMMAND
A
A
...
CODE
1
P
DEFAULT
VALUE
0x00
0x00
0x4F
0x80
Rev A
69
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