Datasheet

LTC3880/LTC3880-1
108
3880fc
For more information www.linear.com/LTC3880
Block Memory Write/Read
COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED
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 N Reg NA
MFR_EE_ERASE 0xBE Initialize user EEPROM for bulk programming by MFR_EE_
DATA.
R/W Byte N 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
N 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 LTC3880 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 0xBD data 0x2B followed by address 0x5B
command 0xBD 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.
Writing 0x2B followed by 0xD5 sets the PEC, resets the EEPROM address pointer and unlocks the part for EEPROM
erase and data command writes.
Writing 0x2B followed by 0x91 and 0xE4 clears PEC, resets the EEPROM address pointer and unlocks the part for
EEPROM data reads of all locations.
Writing 0x2B followed by 0x91 and 0xE5 sets PEC, resets the EEPROM address pointer and unlocks the part for
EEPROM data reads of all locations.
MFR_EE_ERASE
A single write after the appropriate unlock key erases the EEPROM allowing subsequent data writes. This register may
be read to indicate if an EEPROM access is in progress.
A value of 0x2B will erase the EEPROM. If the part is busy writing or erasing the EEPROM a non-zero value will be
returned.
MFR_EE_DAT
A
Sequential writes or reads perform block loads or restores from the EEPROM. Successive MFR_EE_DATA word writes
will enter the EEPROM until it is full. Extra writes will lock the part. The first write is to the lowest address. The first
read returns the 16 bit EEPROM packing revision ID. The second read returns the number of 16 bit words available.
Subsequent reads return EEPROM data starting with the lowest address.
PMBus COMMAND DETAILS