LTC2972 datasheet(71/112 Pages) LINER

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LTC2972

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STATUS_TEMPERATURE

The STATUS_TEMPERATURE command returns the summary of the temperature faults or warnings which have

occurred, as shown in the following table. Note that this information is paged and refers to the temperature of the

associated external diode.

STATUS_TEMPERATURE Data Contents

BIT(S) SYMBOL

OPERATION

b[7] Status_temperature_ot_fault

Overtemperature fault.

b[6] Status_temperature_ot_warn

Overtemperature warning.

b[5] Status_temperature_ut_warn

Undertemperature warning.

b[4] Status_temperature_ut_fault

Undertemperature fault.

b[3] Reserved

Reserved. Always returns 0.

b[2] Reserved

Reserved. Always returns 0.

b[1] Reserved

Reserved. Always returns 0.

b[0] Reserved

Reserved. Always returns 0.

STATUS_CML

The STATUS_CML command returns the summary of the communication, memory and logic faults or warnings which

have occurred, as shown in the following table:

STATUS_CML Data Contents

BIT(S) SYMBOL

OPERATION

b[7] Status_cml_cmd_fault

1 = An illegal or unsupported command fault has occurred.

0 = No fault has occurred.

b[6] Status_cml_data_fault

1 = Illegal or unsupported data received.

0 = No fault has occurred.

b[5] Status_cml_pec_fault

1 = A packet error check fault has occurred. Note: PEC checking is always active in the LTC2972. Any extra

byte received before a STOP will set Status_cml_pec_fault unless the extra byte is a matching PEC byte.

0 = No fault has occurred.

b[4] Status_cml_memory_fault

1 = A fault has occurred in the EEPROM.

0 = No fault has occurred.

b[3] Status_cml_processor_fault

Not supported, always returns 0.

b[2] Reserved

Reserved, always returns 0.

b[1] Status_cml_pmbus_fault

1 = A communication fault other than ones listed in this table has occurred. This is a catch all category for

illegally formed I2C/SMBus commands (Example: An address byte with read =1 received immediately after a

START).

0 = No fault has occurred.

b[0] Status_cml_unknown_fault

Not supported, always returns 0.

PMBus COMMAND DESCRIPTION

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