LTM4686BEVPBF datasheet(104/130 Pages) AD

104 / 130 page

LTM4686B

104

Rev. 0

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APPENDIX C: PMBUS COMMAND DETAILS

MFR_OT_FAULT_RESPONSE

The MFR_OT_FAULT_RESPONSE command byte instructs the device on what action to take in response to an internal

overtemperature fault. The data byte is in the format given in Table 27.

The LTM4686B also:

• Sets the MFR bit in the STATUS_WORD, and

• Sets the Overtemperature Fault bit in the STATUS_MFR_SPECIFIC command

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

This command has one data byte.

Table 27. Data Byte Contents MFR_OT_FAULT_RESPONSE

BITS DESCRIPTION

VALUE MEANING

7:6 Response

For all values of bits [7:6], the LTM4686B:

• 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 RUNn pin, the OPERATION

command, or the combined action of the RUNn pin and

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

• Bias power is removed and reapplied to the LTM4686B

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 Power Stage 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 a power

stage overtemperature fault is detected,

R/W Byte

Reg

0x80

UT_FAULT_ RESPONSE

0x54

Action to be taken by the device when a power

stage undertemperature fault is detected.

R/W Byte

Reg

0x80

OT_FAULT_RESPONSE

The OT_FAULT_RESPONSE command instructs the device on what action to take in response to a power stage over-

temperature fault. The data byte is in the format given in Table 28.

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.

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