LTC3883 Datasheet, PDF (102/112 Pages) Linear Technology – Single Phase Step-Down DC/DC Controller with Digital Power System Management

LTC3883/LTC3883-1
PMBus Command Details
Fault Logging
COMMAND NAME
MFR_FAULT_LOG
MFR_FAULT_LOG_ STORE
MFR_FAULT_LOG_CLEAR
CMD CODE
0xEE
0xEA
0xEC
DESCRIPTION
TYPE
Fault log data bytes. This sequentially retrieved
data is used to assemble a complete fault log.
R Block
Command a transfer of the fault log from RAM to Send Byte
EEPROM. This causes the part to behave as if the
PWM has faulted off.
Initialize the EEPROM block reserved for fault
logging and clear any previous fault logging
locks.
Send Byte
DATA
FORMAT
CF
UNITS
DEFAULT
NVM VALUE
Y
NA
NA
NA
MFR_FAULT_LOG
The MFR_FAULT_LOG command allows the user to read the contents of the FAULT_LOG after the first fault occurrence
since the last MFR_FAULT_LOG_CLEAR command was last written. The contents of this command are stored in non-
volatile memory, and are cleared by the MFR_FAULT_LOG_CLEAR command. The length and content of this command
are listed in Table 11. If the user accesses the MFR_FAULT_LOG command and no fault log is present, the command
will return a data length of 0. If a fault log is present, the MFR_FAUTL_LOG will return a block of data 147 bytes long.
If a fault occurs within the first second of applying power, some of the earlier pages in the fault log may not contain
valid data.
NOTE: The approximate transfer time for this command is 3.4ms using a 400kHz clock.
This read-only command is in block format.
MFR_FAULT_LOG_STORE
The MFR_FAULT_LOG_STORE command forces the fault log operation to be written to NVM just as if a fault event
occurred. This command will set bit 3 of the STATUS_MFR_SPECIFIC fault if bit 7 “Enable Fault Logging” is set in the
MFR_CONFIG_ALL_LTC3883 command.
If the die temperature exceeds 130°C, the MFR_FAULT_LOG_STORE command is disabled until the IC temperature
drops below 125°C.
This write-only command has no data bytes.
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