LTC3882_15 Datasheet, PDF (98/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

LTC3882
PMBus COMMAND DETAILS (Fault Response and Communication)
MFR_FAULT_LOG
The MFR_FAULT_LOG command allows the contents of the fault log to be read. This log is created with a
MFR_FAULT_LOG_STORE command or at the first fault occurrence after a CLEAR_FAULTS or MFR_FAULT_LOG_CLEAR
command. If a fault occurs within the first second after applying power, some earlier pages in the log may not contain
valid data.
This read-only command uses block protocol with 147 bytes of data requiring an estimated data transfer time of 3.4ms
at 400kHz. The t_TIMEOUT parameter is extended when this command is executed and a fault log is present.
MFR_FAULT_LOG_CLEAR
The MFR_FAULT_LOG_CLEAR command erases all stored fault log values. After a clear is issued, up to 8ms may be
required to clear related bit 3 in STATUS_MFR_SPECIFIC.
This write-only command has no data bytes.
EEPROM USER ACCESS
COMMAND NAME
CMD
CODE DESCRIPTION
STORE_USER_ALL
0x15 Store entire operating memory in EEPROM.
RESTORE_USER_ALL
0x16 Restore entire operating memory from
EEPROM.
MFR_COMPARE_USER_ALL
0xF0 Compare operating memory with EEPROM
contents.
MFR_FAULT_LOG_STORE
0xEA Force transfer of fault log from operating
memory to EEPROM.
MFR_EE_UNLOCK
0xBD (contact the factory)
MFR_EE_ERASE
0xBE (contact the factory)
MFR_EE_DATA
0xBF (contact the factory)
USER_DATA_00
0xB0 EEPROM word reserved for LTpowerPlay.
USER_DATA_01
0xB1 EEPROM word reserved for LTpowerPlay.
USER_DATA_02
0xB2 EEPROM word reserved for OEM use.
USER_DATA_03
0xB3 EEPROM word available for general data
storage.
USER_DATA_04
0xB4 EEPROM word available for general data
storage.
Related commands: MFR_CONFIG_ALL_LTC3882
DATA
TYPE PAGED FORMAT
Send Byte N
Send Byte N
UNITS NVM
DEFAULT
VALUE
NA
NA
Send Byte N
Send Byte N
R/W Word N
Reg
R/W Word Y
Reg
R/W Word N
Reg
R/W Word Y
Reg
R/W Word N
Reg
l
l
l
l 0x0000
l 0x0000
Note that if the LTC3882 die temperature exceeds 130°C, execution of any command in the above table except RE-
STORE_USER_ALL and MFR_FAULT_LOG_STORE will be disabled until the IC temperature drops below 125°C. RE-
STORE_USER_ALL is executed immediately, and MFR_FAULT_LOG_STORE is executed after the IC temperature drops
below 125°C. Refer to Table 4 for details of fault log contents. Using any command that writes data to the EEPROM is
strongly discouraged if bit 6 of STATUS_MFR_ SPECIFIC is set, indicating the internal die temperature is above 85°C.
Data retention of 10 years is not guaranteed if the EEPROM is written above a junction temperature of 85°C.
3882f
98
For more information www.linear.com/LTC3882