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LTC2977
22
2977fa
For more information www.linear.com/LTC2977
Processing Commands
The LTC2977 uses a dedicated processing block to ensure quick response to all of its commands. There are a few
exceptions where the part will NACK a subsequent command because it is still processing the previous command.
These are summarized in the following tables. MFR_COMMON is a special command that may always be read even
when the part is busy. This provides an alternate method for a host to determine if the LTC2977 is busy.
EEPROM Related Commands
COMMAND TYPICAL DELAY* COMMENT
STORE_USER_ALL t
MASS_WRITE
See Electrical Characteristics table. The LTC2977 will not accept any commands while it is transferring
register contents to the EEPROM. The command byte will be NACKed. MFR_COMMON may always be read.
RESTORE_USER_ALL 30ms The LTC2977 will not accept any commands while it is transferring EEPROM data to command
registers. The command byte will be NACKed. MFR_COMMON may always be read.
MFR_FAULT_LOG_CLEAR 175ms The LTC2977 will not accept any commands while it is initializing the fault log EEPROM space. The
command byte will be NACKed. MFR_COMMON may always be read.
MFR_FAULT_LOG_STORE 20ms The LTC2977 will not accept any commands while it is transferring the fault log RAM buffer to EEPROM
space. The command byte will be NACKed. MFR_COMMON may always be read.
Internal Fault log 20ms An internal fault log event is a one time event that uploads the contents of the fault log to EEPROM in
response to a fault. Internal fault logging may be disabled. Commands received during this EEPROM
write are NACKed. MFR_COMMON may always be read.
MFR_FAULT_LOG_
RESTORE
2ms The LTC2977 will not accept any
commands while it is transferring EEPROM data to the fault log RAM
buffer. The command byte will be NACKed. MFR_COMMON may always be read.
*The typical delay is measured from the command’s stop to the next command’s start.
COMMAND T
YPICAL DELAY* COMMENT
MFR_CONFIG_LT C 2977 <50µs The LTC2977 will not accept any commands while it is completing this command. The command byte
will be NACKed. MFR_COMMON may always be read.
*The typical delay is measured from the command’s stop to the next command’s start.
Other PMBus Timing Notes
COMMAND COMMENT
CLEAR_FAULTS The LTC2977 will accept commands while it is completing this command but the affected status flags will not be cleared for
up to 500µs.
OPERATION