LTC2978C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2978C' PDF : 64 Pages View PDF
LTC2978
Operation
Processing Commands
The LTC2978 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.
EEPROM Related Commands
COMMAND
STORE_USER_ALL
TYPICAL DELAY*
tMASS_WRITE
COMMENT
See Electrical Characteristics table. The LTC2978 will not accept any commands while it is
transferring register contents to the EEPROM. The command byte will be NACKed.
RESTORE_USER_ALL
30ms
The LTC2978 will not accept any commands while it is transferring EEPROM data to command
registers. The command byte will be NACKed.
MFR_FAULT_LOG_CLEAR
175ms
The LTC2978 will not accept any commands while it is initializing the fault log EEPROM space. The
command byte will be NACKed.
MFR_FAULT_LOG_STORE
20ms
The LTC2978 will not accept any commands while it is transferring the fault log RAM buffer to
EEPROM space. The command byte will be NACKed.
Internal Fault log
10ms
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_FAULT_LOG_
RESTORE
2ms
The LTC2978 will not accept any commands while it is transferring EEPROM data to the fault log
RAM buffer. The command byte will be NACKed.
*The typical delay is measured from the command’s stop to the next command’s start.
COMMAND
TYPICAL DELAY*
COMMENT
MFR_CONFIG_LTC2978
<50µs
The LTC2978 will not accept any commands while it is completing this command. The command byte
will be NACKed.
*The delay is measured from the command’s stop to the next command’s start.
Other PMBus Timing Notes
COMMAND
COMMENT
CLEAR_FAULTS
The LTC2978 will accept commands while it is completing this command but the affected status flags will not be cleared
for up to 500µs.
For more information www.linear.com/LTC2978
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