Nvm Memory Commands; Store/Restore - Analog Devices Linear ADI Power LTM4681 Manual

LTM4681
PMBus COMMAND DETAILS

NVM MEMORY COMMANDS

Store/Restore

COMMAND NAME
STORE_USER_ALL
RESTORE_USER_ALL
MFR_COMPARE_USER_ALL
STORE_USER_ALL
The STORE_USER_ALL command instructs the PMBus device to copy the non-volatile user contents of the Operating
Memory to the matching locations in the non-volatile User NVM memory.
Executing this command if the die temperature exceeds 85°C or is below 0°C is not recommended and the data reten-
tion of 10 years cannot be guaranteed. If the die temperature exceeds 130°C, the STORE_USER_ALL command is
disabled. The command is re-enabled when the IC temperature drops below 125°C.
Communication with the LTM4681 and programming of the NVM can be initiated when EXTV
and VIN is not applied. To enable the part in this state, using global address 0x5B write MFR_EE_UNLOCK to 0x2B
followed by 0xC4. The LTM4681 will now communicate normally, and the project file can be updated. To write the
updated project file to the NVM issue a STORE_USER_ALL command. When VIN is applied, a MFR_RESET must be
issued to allow the PWM to be enabled and valid ADCs to be read.
This write-only command has no data bytes.
RESTORE_USER_ALL
The RESTORE_USER_ALL command instructs the LTM4681 to copy the contents of the non-volatile User memory
to the matching locations in the Operating Memory. The values in the Operating Memory are overwritten by the value
retrieved from the User commands. The LTM4681 ensures both channels are off, loads the operating memory from
the internal EEPROM, clears all faults, reads the resistor configuration pins, and then performs a soft-start of both
PWM channels if applicable.
STORE_USER_ALL, MFR_COMPARE_USER_ALL and RESTORE_USER_ALL commands are disabled if the die exceeds
130°C and are not re-enabled until the die temperature drops below 125°C.
This write-only command has no data bytes.
MFR_COMPARE_USER_ALL
The MFR_COMPARE_USER_ALL command instructs the PMBus device to compare current command contents with
what is stored in non-volatile memory. If the compare operation detects differences, a CML bit 0 fault will be generated.
This write-only command has no data bytes.
124
CMD
CODE DESCRIPTION
0x15 Store user operating memory to
EEPROM.
0x16 Restore user operating memory from
EEPROM.
0xF0 Compares current command contents
with NVM.
For more information
TYPE PAGED FORMAT
Send Byte N
Send Byte N
Send Byte N
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DEFAULT
UNITS NVM VALUE
NA
NA
NA
or VDD33 is available
CC
Rev. A