LTC3883 Datasheet, PDF (65/112 Pages) Linear Technology – Single Phase Step-Down DC/DC Controller with Digital Power System Management

LTC3883/LTC3883-1
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 ad-
dress. If the ASEL pin is open, the LTC3883 will use the address value stored in NVM.
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 LTC3883 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
CMD CODE DESCRIPTION
MFR_CHAN_CONFIG_LTC3883 0xD0 Configuration bits that are channel specific.
MFR_CONFIG_ALL_LTC3883
0xD1 General configuration bits.
TYPE
R/W Byte
R/W Byte
DATA
FORMAT
Reg
Reg
UNITS
DEFAULT
NVM VALUE
Y
0x1F
Y 0x09
MFR_CHAN_CONFIG_LTC3883
General purpose configuration command common to multiple LTC 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 Short Cycle. When asserted the output will immediate off if commanded ON while waiting for TOFF_DELAY or TOFF_FALL. TOFF_MIN of 120mS
is honored then the part will command ON.
2 SHARE_CLOCK control. If SHARE_CLOCK is held low, the output is disabled
1 No GPIO ALERT, ALERT is not pulled low if GPIO is pulled low externally. Assert this bit if either POWER_GOOD or VOUT_UVUF are propagated
on GPIO.
0 Disables the VOUT decay value requirement for MFR_RETRY_TIME processing. When this bit is set to a 0, the output must decay to 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.
3883f
65