LTC2977 datasheet(113/138 Pages) AD

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LTM4664A

113

Rev. 0

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PMBus COMMAND DETAILS

Table 16. IOUT_OC_FAULT_RESPONSE Data Byte Contents

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

• The device receives a RESTORE_USER_ALL command.

• The device receives a MFR_RESET command.

• The device supply power is cycled.

The LTM4664A PSM continues to operate indefinitely while

maintaining the output current at the value set by

IOUT_OC_FAULT_LIMIT without regard to the output

voltage (known as constant-current or brick-wall limiting).

Not supported.

The LTM4664A PSM continues to operate, maintaining the

output current at the value set by IOUT_OC_FAULT_LIMIT

without regard to the output voltage, for the delay time set by

bits [2:0]. If the device is still operating in current limit at the

end of the delay time, the device responds as programmed by

the Retry Setting in bits [5:3].

The LTM4664A PSM shuts down immediately and responds as

programmed by the Retry Setting in bits [5:3].

5:3

Retry Setting

000

The unit does not attempt to restart. The output remains

disabled until the fault is cleared by cycling the RUN pin or

removing bias power.

111

The device attempts to restart continuously, without limitation,

until it is commanded OFF (by the RUN pin or OPERATION

command or both), bias power is removed, or another fault

condition causes the unit to shut down. Note: The retry interval

is set by the MFR_RETRY_DELAY command.

2:0

Delay Time

000-111 The number of delay time units in 16ms increments. This

delay time is used to determine the amount of time a unit is

to continue operating after a fault is detected before shutting

down. Only valid for deglitched off response.

Fault Responses IC Temperature

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS

NVM

DEFAULT

VALUE

MFR_OT_FAULT_RESPONSE

0xD6

Action to be taken by the device when an

internal overtemperature fault is detected.

R Byte

Reg

0xC0

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 12.

The LTM4664A also:

• Sets the NONE_OF_THE_ABOVE bit in the STATUS_BYTE

• 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.

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