LTC2977 datasheet(130/138 Pages) AD

130 / 138 page

LTM4664A

130

Rev. 0

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NVM MEMORY COMMANDS

Store/Restore

COMMAND NAME

CMD

CODE

DESCRIPTION

TYPE

PAGED

FORMAT

UNITS

NVM

DEFAULT

VALUE

STORE_USER_ALL

0x15

Store user operating memory to

EEPROM.

Send Byte

RESTORE_USER_ALL

0x16

Restore user operating memory from

EEPROM.

Send Byte

MFR_COMPARE_USER_ALL

0xF0

Compares current command contents

with NVM.

Send Byte

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 retention

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 LTM4664A and programming of the NVM can be initiated when EXTVCC or VDD33 is available

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 LTM4664A 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 LTM4664A 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 LTM4664A 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.

PMBus COMMAND DETAILS

LTC2977 Datasheet(PDF) 130 Page - Analog Devices

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