LTC3883 Datasheet, PDF (66/112 Pages) Linear Technology – Single Phase Step-Down DC/DC Controller with Digital Power System Management

LTC3883/LTC3883-1
PMBus Command Details
MFR_CONFIG_ALL_LTC3883
General purpose configuration command common to multiple LTC products
BIT MEANING
7 Enable Fault Logging
6 Ignore Resistor Configuration Pins
5 Reserved
4 Reserved
3 Mask PLL Unlock Fault
2 A valid PEC required for PMBus writes to be accepted. If this bit is not
set, the part will accept commands with invalid PEC.
1 Enable the use of PMBus clock stretching
0 Reserved
This command has one data byte.
On/Off/Margin
COMMAND NAME
CMD
CODE
ON_OFF_CONFIG
0x02
OPERATION
0x01
MFR_RESET
0xFD
DESCRIPTION
RUN pin and PMBus bus on/off command configuration.
Operating mode control. On/off, margin high and margin low.
Commanded reset without requiring a power-down.
DATA
DEFAULT
TYPE FORMAT UNITS NVM VALUE
R/W Byte Reg
Y
0x1E
R/W Byte Reg
Y
0x80
Send Byte
NA
ON_OFF_CONFIG
The ON_OFF_CONFIG command configures the combination of RUN pin input and serial bus commands needed to
turn the unit on and off. This includes how the unit responds when power is applied.
The only bits allowed to be changed are as follows:
3: Controls how the unit responds to commands received via the serial bus
0: RUN pin action when commanding the unit to turn off. If bit 0 is set to one, the part will stop transferring power to
the output stage as fast as possible. This will have the effect of the load discharging the output capacitor. Setting
bit 0 to a zero will cause the regulator to use the programmed turn-off delay and fall times. If the part is in continu-
ous mode, the programmed turn-off response may pull the output to zero volts considerably faster than removing
power immediately from the load.
Changing the value of bits 4, 2 or 1, will generate a CML fault.
This command has one data byte.
3883f
66