Datasheet

LTC3883/LTC3883-1
101
3883fa
For more information www.linear.com/LTC3883
Fault Logging
COMMAND NAME CMD CODE DESCRIPTION TYPE
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 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 the
PWM has faulted off.
Send Byte NA
MFR_FAULT_LOG_CLEAR 0xEC Initialize the EEPROM block reserved for fault
logging and clear any previous fault logging
locks.
Send Byte 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_LT C 3883 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.
Table 11. Fault Logging
This table outlines the format of the block data from a read block data of the MFR_FAULT_LOG command.
Data Format Definitions LIN 11 = PMBus = Rev 1.1, Part 2, section 7.1
LIN 16 = PMBus Rev 1.1, Part 2, section 8. Mantissa portion only
BYTE = 8 bits interpreted per definition of this command
DATA BITS
DATA
FORMAT BYTE NUM
BLOCK READ COMMAND
Block Length BYTE 147 The MFR_FAULT_LOG command is a fixed length of 147 bytes
The block length will be zero if a data log event has not been captured
HEADER INFORMATION
Fault Position BYTE 0 Indicates the fault that caused the fault log to be activated.
PMBus COMMAND DETAILS