Datasheet

LTC3883/LTC3883-1
104
3883fa
For more information www.linear.com/LTC3883
Reserved BYTE 144 Always returns 0x00.
STATUS_MFR_SPECIFIC BYTE 145
Reserved BYTE 146 Always returns 0x00.
Table 11a: Explanation of Position_Fault Values
POSITION_FAULT VALUE SOURCE OF FAULT LOG
0xFF MFR_FAULT_LOG_STORE
0x00 TON_MAX_FAULT
0x01 VOUT_OV_FAULT
0x02 VOUT_UV_FAULT
0x03 IOUT_OC_FAULT
0x05 TEMP_OT_FAULT
0x06 TEMP_UT_FAULT
0x07 VIN_OV_FAULT
0x0A MFR_TEMP_2_OT_FAULT
MFR_FAULT_LOG_CLEAR
The MFR_FAULT_LOG_CLEAR command will erase the fault log file stored values. It will also clear bit 3 in the
STATUS_MFR_SPECIFIC command. After a clear is issued, the status can take up to 8ms to clear.
This
write-only command is send bytes.
Block Memory Write/Read
COMMAND NAME CMD CODE DESCRIPTION TYPE
DATA
FORMAT UNITS NVM
DEFAULT
VALUE
MFR_EE_UNLOCK 0xBD Unlock user EEPROM for access by MFR_EE_ERASE and
MFR_EE_DATA commands.
R/W Byte Reg NA
MFR_EE_ERASE 0xBE Initialize user EEPROM for bulk programming by MFR_EE_
DATA.
R/W Byte Reg NA
MFR_EE_DATA 0xBF Data transferred to and from EEPROM using sequential
PMBus word reads or writes. Supports bulk programming.
R/W
Word
Reg NA
All the NVM commands are disabled if the die temperature exceeds 130°C. NVM commands are re-enabled when the
die temperature drops below 125°C.
MFR_EE_UNLOCK
Multiple writes to MFR_EE_UNLOCK with the appropriate unlock keys are used to enable MFR_EE_ERASE and MFR_
EE_DATA access and configure PEC.
Communication with the LTC3883 and programming of the NVM can be initiated when VDD33 is applied and VIN is not.
To enable the part in this state, use global address 0x5B command MFR_EE_UNLOCK data 0x2B followed by address
0x5B command MFR_EE_UNLOCK data 0xC4. When VIN is applied, a MFR_RESET must be issued to allow the PWM
to be enabled and valid ADCs to be read.
Writing 0x2B followed by
0xD4 clears PEC, resets the EEPROM address pointer and unlocks the part for EEPROM
erase and data command writes.
PMBus COMMAND DETAILS