Fault Logging - Analog Devices Linear LTM 4700 User Manual

LTM4700
PMBus COMMAND DETAILS

Fault Logging

COMMAND NAME CMD CODE DESCRIPTION
MFR_FAULT_LOG
MFR_FAULT_LOG_ STORE
MFR_FAULT_LOG_CLEAR
MFR_FAULT_LOG
The MFR_FAULT_LOG command allows the user to read the contents of the FAULT_LOG after the first fault occur-
rence since the last MFR_FAULT_LOG_CLEAR command was 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 15. 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_FAULT_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 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.
116
0xEE Fault log data bytes.
0xEA Command a transfer of the fault log from RAM
to EEPROM.
0xEC Initialize the EEPROM block reserved for fault
logging.
For more information
TYPE PAGED
R Block N
Send Byte N
Send Byte N
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DATA DEFAULT
FORMAT UNITS NVM VALUE
Reg Y NA
NA
NA
Rev. B