LTC2972 datasheet(80/112 Pages) LINER

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LTC2972

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MFR_FAULT_LOG_STORE

This command allows the user to transfer data from the RAM buffer to EEPROM.

MFR_FAULT_LOG_RESTORE

This command allows the user to transfer a copy of the fault-log data from the EEPROM to the RAM buffer. After a

restore the RAM buffer is locked until a successful Mfr_fault_log read.

MFR_FAULT_LOG_CLEAR

This command initializes the EEPROM block reserved for fault logging. Any previous fault log stored in EEPROM will

be erased by this operation and logging of the fault log RAM to EEPROM will be enabled. Make sure that Mfr_fault_

log_status_ram = 0 before issuing the MFR_FAULT_LOG_CLEAR command.

MFR_FAULT_LOG_STATUS

This register is used to manage fault log events. The Mfr_fault_log_status_eeprom bit is set after a MFR_FAULT_LOG_

STORE command or a faulted-off event triggers a transfer of the fault log from RAM to EEPROM. This bit is cleared

by a MFR_FAULT_LOG_CLEAR command.

Mfr_fault_log_status_ram is set after a MFR_FAULT_ LOG_RESTORE to indicate that the data in the RAM has been

restored from EEPROM and not yet read using a MFR_FAULT_LOG command. This bit is cleared only by a successful

execution of an MFR_FAULT_LOG command.

MFR_FAULT_LOG_STATUS Data Contents

BIT(S) SYMBOL

OPERATION

b[7:2] Reserved

Read only, always returns 0s.

b[1] Mfr_fault_log_status_ram

Fault log RAM status:

0: The fault log RAM allows updates.

1: The fault log RAM is locked until the next Mfr_fault_log read.

b[0] Mfr_fault_log_status_eeprom Fault log EEPROM status:

0: The transfer of the fault log RAM to the EEPROM is enabled.

1: The transfer of the fault log RAM to the EEPROM is inhibited.

MFR_FAULT_LOG

Read only. This 2040-bit (255-byte) data block contains a copy of the RAM buffer fault log. The RAM buffer is continu-

ously updated after each ADC conversion as long as Mfr_fault_log_status_eeprom is clear.

With Mfr_config_fault_log_enable = 1 and Mfr_fault_log_status_eeprom = 0, the RAM buffer is transferred to EEPROM

whenever an LTC2972 fault causes a channel to latch off or a MFR_FAULT_LOG_STORE command is received. This

transfer is delayed until the ADC has updated its READ values for both channels when Mfr_config_all_fast_fault_log

is clear, otherwise it happens within 24ms. This optional delay can be used to ensure that the slower ADC monitored

values are all updated for the case where a fast supervisor detected fault initiates the transfer to EEPROM.

Mfr_fault_log_status_eeprom is set high after the RAM buffer is transferred to EEPROM and not cleared until a

Mfr_fault_log_clear is received, even if the LTC2972 is reset or powered down. Fault log EEPROM transfers are not

initiated as a result of Status_mfr_discharge events.

PMBus COMMAND DESCRIPTION

LTC2972 Datasheet(PDF) 80 Page - Linear Technology

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