LTC2972 datasheet(79/112 Pages) LINER

79 / 112 page

LTC2972

2972fa

For more information www.linear.com/LTC2972

Fault Log Operation

A conceptual diagram of the fault log is shown in Figure 21. The fault log provides black box capability for the LTC2972.

During normal operation the contents of the status registers, the output voltage/current/temperature readings, the

input voltage readings, as well as peak and min values of these quantities, are stored in a continuously updated buffer

in RAM. You can think of the operation as being similar to a strip chart recorder. When a fault occurs, the contents are

written into EEPROM for non volatile storage. The EEPROM fault log is then locked. The part can be powered down

with the fault log available for reading at a later time.

Figure 21. Fault Logging

MFR_IOUT_MIN

This command returns the minimum ADC measured value of the channel’s output current. This register is reset to

0x7BFF (approximately 225) when the LTC2972 emerges from power-on reset, when a CLEAR_FAULTS command is

executed to the page, or the channel goes through an off-to-on transition.

MFR_TEMPERATURE_1_MIN

This command returns the minimum measured value of the external diode temperature in °C. This register is reset to

0x7BFF (approximately 225) when the LTC2972 emerges from power-on reset, when a CLEAR_FAULTS command is

executed to the page, or the channel goes through an off-to-on transition.

FAULT LOGGING

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED FORMAT UNITS EEPROM

DEFAULT

VALUE

REF

PAGE

MFR_FAULT_LOG_STORE

0xEA Command a transfer of the fault log from RAM to

EEPROM.

Send Byte

MFR_FAULT_LOG_RESTORE 0xEB Command a transfer of the fault log previously

stored in EEPROM back to RAM.

Send Byte

MFR_FAULT_LOG_CLEAR

0xEC Initialize the EEPROM block reserved for fault

logging and clear any previous fault logging locks.

Send Byte

MFR_FAULT_LOG_STATUS

0xED Fault logging status.

R Byte

Reg

MFR_FAULT_LOG

0xEE Fault log data bytes. This sequentially retrieved

data is used to assemble a complete fault log.

R Block

Reg

PMBus COMMAND DESCRIPTION

•

TIME OF FAULT

TRANSFER TO EEPROM

AND LOCK

ADC READINGS

CONTINUOUSLY

FILL BUFFER

EEPROM

255 BYTES

2972 F21

RAM

255 BYTES

AFTER FAULT

READ FROM EEPROM

AND LOCK BUFFER

•

LTC2972 Datasheet(PDF) 79 Page - Linear Technology

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