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LTM2987 Datasheet(PDF) 24 Page - Analog Devices |
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LTM2987 Datasheet(HTML) 24 Page - Analog Devices |
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24 / 114 page  LTC2971 24 Rev. 0 For more information www.analog.com OPERATION EEPROM Related Commands COMMAND TYPICAL DELAY* COMMENT STORE_USER_ALL tMASS_WRITE See Electrical Characterization table. The LTC2971 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 LTC2971 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 LTC2971 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 LTC2971 will not accept any commands while it is transferring 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 LTC2971 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. Other Commands COMMAND TYPICAL DELAY* COMMENT MFR_CONFIG <50µs The LTC2971 will not accept any commands while it is completing this command. The command byte will be NACKed. MFR_COMMON may always be read. IOUT_CAL_GAIN and IOUT_CAL_OFFSET <500µs The LTC2971 will not accept any commands while it is completing this command. The command byte will be NACKed. MFR_COMMON may always be read. *The delay is measured from the command’s stop to the next command’s start. Other PMBus Timing Notes COMMAND COMMENT CLEAR_FAULTS The LTC2971 will accept commands while it is completing this command but the affected status flags will not be cleared for up to 500µs. Processing Commands The LTC2971 uses a dedicated processing block to ensure quick response to all of its commands. There are a few ex- ceptions where the part will NACK a subsequent command becauseitisstillprocessingthepreviouscommand.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 LTC2971 is busy. |
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