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LTM4700
PMBus COMMAND DETAILS
MFR_ADDRESS
The MFR_ADDRESS command byte sets the 7 bits of the PMBus slave address for this device.
Setting this command to a value of 0x80 disables device addressing. The GLOBAL device address, 0x5A and 0x5B,
cannot be deactivated. If RCONFIG is set to ignore, the ASEL pin is still used to determine the LSB of the channel
address. If the ASEL pin is open, the LTM4700 will use the MFR_ADDRESS value stored in NVM to construct the ef-
fective address of the part.
This command has one data byte.
MFR_RAIL_ADDRESS
The MFR_RAIL_ADDRESS command enables direct device address access to the PAGE activated channel. The value
of this command should be common to all devices attached to a single power supply rail.
The user should only perform command writes to this address. If a read is performed from this address and the rail
devices do not respond with EXACTLY the same value, the LTM4700 will detect bus contention and may set a CML
communications fault.
Setting this command to a value of 0x80 disables rail device addressing for the channel.
This command has one data byte.
GENERAL CONFIGURATION COMMANDS
COMMAND NAME
MFR_CHAN_CONFIG
MFR_CONFIG_ALL
MFR_CHAN_CONFIG
General purpose configuration command common to multiple ADI products.
BIT
MEANING
7
Reserved
6
Reserved
5
Reserved
4
Disable RUN Low. When asserted the RUN pin is not pulsed low if commanded OFF .
3
Enable Short Cycle recognition if this bit is set to a 1.
2
SHARE_CLOCK control. If SHARE_CLOCK is held low, the output is disabled.
1
No FAULT ALERT, ALERT is not pulled low if FAULT is pulled low externally. Assert this bit if either POWER_GOOD or VOUT_UVUF are
propagated on FAULT.
0
Disables the V
decay value requirement for MFR_RETRY_TIME and t
OUT
less than 12.5% of the programmed value for any action that turns off the rail including a fault, an OFF/ON command, or a toggle of RUN from
high to low to high.
This command has one data byte.
78
CMD CODE DESCRIPTION
0xD0
Configuration bits that are channel specific.
0xD1
General configuration bits.
For more information
TYPE
PAGED
R/W Byte
Y
R/W Byte
N
processing. When this bit is set to a 0, the output must decay to
OFF(MIN)
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DATA
DEFAULT
FORMAT UNITS
NVM
VALUE
Reg
Y
0x1D
Reg
Y
0x21
Rev. B
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