LTM4686BEVPBF datasheet(102/130 Pages) AD

102 / 130 page

LTM4686B

102

Rev. 0

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APPENDIX C: PMBUS COMMAND DETAILS

Table 25. VOUT_UV_FAULT_RESPONSE Data Byte Contents

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

The PMBus device continues operation without interruption.

(Ignores the fault functionally)

The PMBus device continues operation for the delay time

specified by bits [2:0] and the delay time unit specified for

that particular fault. If the fault condition is still present at the

end of the delay time, the unit responds as programmed in the

Retry Setting (bits [5:3]).

The device shuts down (disables the output) and responds

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

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

5:3

Retry Setting

000–110 The unit does not attempt to restart. The output remains

disabled until the fault is cleared until the device is commanded

OFF bias power is removed.

111

The PMBus device attempts to restart continuously, without

limitation, until it is commanded OFF (by the RUNn pin or

OPERATION command or both), bias power is removed, or

another fault condition causes the unit to shut down without

retry. Note: The retry interval is set by the MFR_RETRY_DELAY

command.

2:0

Delay Time

XXX

The delay time in 10µs increments. This delay time determines

how long the controller continues operating after a fault is

detected. Only valid for deglitched off state.

TON_MAX_FAULT_RESPONSE

The TON_MAX_FAULT_RESPONSE command instructs the device on what action to take in response to a TON_MAX

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

The device also:

• Sets the NONE_OF_THE_ABOVE bit in the STATUS_BYTE

• Sets the VOUT bit in the STATUS_WORD

• Sets the TON_MAX_FAULT bit in the STATUS_VOUT command, and

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

• A value of 0 disables the TON_MAX_FAULT_RESPONSE. It is not recommended to use 0.

This command has one data byte.

Fault Responses Output Current

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

IOUT_OC_FAULT_RESPONSE

0x47

Action to be taken by the device when an

output overcurrent fault is detected.

R/W Byte

Reg

0x00

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