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LTM4700
PMBus COMMAND DETAILS
ADDRESSING AND WRITE PROTECT
CMD
COMMAND NAME
CODE DESCRIPTION
PAGE
0x00 Provides integration with multi-page PMBus devices.
PAGE_PLUS_WRITE
0x05 Write a supported command directly to a PWM channel. W Block
PAGE_PLUS_READ
0x06 Read a supported command directly from a PWM
WRITE_PROTECT
0x10 Level of protection provided by the device against
MFR_ADDRESS
0xE6 Sets the 7-bit I
MFR_RAIL_ADDRESS
0xFA Common address for PolyPhase outputs to adjust
PAGE
The PAGE command provides the ability to configure, control and monitor both PWM channels through only one physi-
cal address, either the MFR_ADDRESS or GLOBAL device address. Each PAGE contains the operating commands 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 LTM4700
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 51.
1
SLAVE
S
ADDRESS
PAGE_PLUS_READ
The PAGE_PLUS_READ command provides the ability to set the page within a device, send a command, and then read
the data returned by the command, all in one communication packet .
76
channel.
accidental changes.
2
C address byte.
common parameters.
7
1
1
8
1
PAGE_PLUS
W A
A
COMMAND CODE
8
1
LOWER DATA
UPPER DATA
A
BYTE
Figure 51. Example of PAGE_PLUS_WRITE
For more information
TYPE
R/W Byte
Block
R/W
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
4700 F51
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DATA
PAGED
FORMAT UNITS NVM
N
Reg
N
N
N
Reg
N
Reg
Y
Reg
1
8
1
COMMAND
A
A
...
CODE
1
P
DEFAULT
VALUE
0x00
Y
0x00
Y
0x4F
Y
0x80
Rev. B
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