LTC3882_15 Datasheet, PDF (66/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

LTC3882
PMBus COMMAND DETAILS (by functional groups)
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 Block R/W N
page.
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
l
l
l
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. Reading from the device with PAGE
set to 0xFF is not recommended.
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
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
3882 F49
Figure 49. Example of PAGE_PLUS_WRITE
3882f
66
For more information www.linear.com/LTC3882