LTM4675_15 Datasheet, PDF (82/128 Pages) Linear Technology – Dual 9A or Single 18A Module Regulator with Digital Power System Management

LTM4675
APPENDIX C: PMBUS COMMAND DETAILS
ADDRESSING AND WRITE PROTECT
COMMAND NAME
CMD
CODE DESCRIPTION
DATA
TYPE PAGED FORMAT
PAGE
0x00 Channel (page) presently selected for any R/W Byte N
Reg
paged command.
PAGE_PLUS_WRITE
0x05 Write a command directly to a specified page. W Block N
PAGE_PLUS_READ
0x06 Read a command directly from a specified
page.
Block R/W N
Process
WRITE_PROTECT
0x10 Protect the device against unintended PMBus R/W Byte N
Reg
modifications.
MFR_ADDRESS
0xE6 Specify right-justified 7-bit device address. R/W Byte N
Reg
MFR_RAIL_ADDRESS
0xFA Specify unique right-justified 7-bit address R/W Byte Y
Reg
for channels comprising a PolyPhase output.
Related commands: MFR_COMMON.
UNITS NVM
Y
Y
Y
DEFAULT
VALUE
0x00
0x00
0x4F
0x80
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 LTM4675
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 55.
1
7
11
8
1
8
1
S
SLAVE
ADDRESS
W
A
PAGE_PLUS
COMMAND CODE
A
BLOCK COUNT
(= 4)
A
8
PAGE
NUMBER
1
8
1
A
COMMAND
CODE
A…
8
1
8
1
LOWER DATA
BYTE
A
UPPER DATA
BYTE
A
8
PEC BYTE
11
AP
4675 F55
Figure 55. Example of PAGE_PLUS_WRITE
4675f
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