LTC2977 datasheet(114/138 Pages) AD

114 / 138 page

LTM4664A

114

Rev. 0

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Table 17. Data Byte Contents MFR_OT_FAULT_RESPONSE

BITS

DESCRIPTION

VALUE MEANING

7:6

Response

For all values of bits [7:6], the LTM4664A:

• Sets the corresponding fault bit in the status commands and

• Notifies the host by asserting ALERT pin, unless masked.

The fault bit, once set, is cleared only when one or more of the

following events occurs:

• The device receives a CLEAR_FAULTS command.

• The output is commanded through the RUN pin, the OPERATION

command, or the combined action of the RUN pin and

OPERATION command, to turn off and then to turn back on, or

• Bias power is removed and reapplied to the LTM4664A.

Not supported. Writing this value will generate a CML fault.

Not supported. Writing this value will generate a CML fault

The device shuts down immediately (disables the output) and

responds according to the retry setting in bits [5:3].

The device’s output is disabled while the fault is present.

Operation resumes and the output is enabled when the fault

condition no longer exists.

5:3

Retry Setting

000

The unit does not attempt to restart. The output remains

disabled until the fault is cleared.

001-111 Not supported. Writing this value will generate CML fault.

2:0

Delay Time

XXX

Not supported. Value ignored

Fault Responses External Temperature

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS

NVM

DEFAULT

VALUE

OT_FAULT_ RESPONSE

0x50

Action to be taken by the device when an

external overtemperature fault is detected,

R/W Byte

Reg

0xB8

UT_FAULT_ RESPONSE

0x54

Action to be taken by the device when an

external undertemperature fault is detected.

R/W Byte

Reg

0xB8

OT_FAULT_RESPONSE

The OT_FAULT_RESPONSE command instructs the device on what action to take in response to an external overtem-

perature fault on the external temp sensors. The data byte is in the format given in Table 8.

The device also:

• Sets the TEMPERATURE bit in the STATUS_BYTE

• Sets the Overtemperature Fault bit in the STATUS_TEMPERATURE command, and

• Notifies the host by asserting ALERT pin, unless masked

This command has one data byte.

UT_FAULT_RESPONSE

The UT_FAULT_RESPONSE command instructs the device on what action to take in response to an external under-

temperature fault on the external temp sensors. The data byte is in the format given in Table 13.

The device also:

• Sets the TEMPERATURE bit in the STATUS_BYTE

• Sets the Undertemperature Fault bit in the STATUS_TEMPERATURE command, and

• Notifies the host by asserting ALERT pin, unless masked

PMBus COMMAND DETAILS

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