Datasheet

LTC3880/LTC3880-1
102
3880fc
For more information www.linear.com/LTC3880
Fault Logging
COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED
DATA
FORMAT UNITS NVM
DEFAULT
VALUE
MFR_FAULT_LOG 0xEE Fault log data bytes. This sequentially retrieved
data is used to assemble a complete fault log.
R Block N CF Y NA
MFR_FAULT_LOG_ STORE 0xEA Command a transfer of the fault log from RAM to
EEPROM. This causes the part to behave as if a
channel has faulted off.
Send Byte N NA
MFR_FAULT_LOG_CLEAR 0xEC Initialize the EEPROM block reserved for fault
logging and clear any previous fault logging
locks.
Send Byte N 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 always 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. When a fault occurs and Fault Log is enabled, a header section and the last 6 ADC events are
stored in NVM. If the Fault Log is read before a reset occurs, the most recent event is in location N (the first location).
If the part resets or V
IN
is lost, the event may appear in any one of the 6 cyclical data locations.
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 generate a MFR_SPECIFIC fault if the “Enable Fault Logging” bit is set in the MFR_
CONFIG_ALL_LTC3880 command.
If the die temperature exceeds 130°C, the MFR_FAULT_LOG_STORE command is disabled until the IC temperature
drops below 125°C.
Up-Time Counter is in the Fault Log header. The counter is the time since the last reset in 200µs increments. This is
a 48-bit binary counter.
This write-only command has no data bytes.
PMBus COMMAND DETAILS