LTM4631 datasheet(99/130 Pages) AD

99 / 130 page

LTM4686B

Rev. 0

For more information www.analog.com

APPENDIX C: PMBUS COMMAND DETAILS

FAULT RESPONSE

Fault Responses All Faults

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS

NVM

DEFAULT

VALUE

MFR_RETRY_ DELAY

0xDB

Retry interval during FAULT retry mode.

R/W Word

L11

350

0xFABC

MFR_RETRY_DELAY

This command sets the time in milliseconds between restarts if the fault response is to retry the controller at specified

intervals. This command value is used for all fault responses that require retry. The retry time starts once the fault has

been detected by the offending channel. Valid values are from 120ms to 83.88 seconds in 1ms increments.

Note: The retry delay time is determined by the longer of the MFR_RETRY_DELAY command or the time required

for the regulated output to decay below 12.5% of the programmed value. If the natural decay time of the output is

too long, it is possible to remove the voltage requirement of the MFR_RETRY_DELAY command by asserting bit 0 of

MFR_CHAN_CONFIG.

This command has two data bytes and is formatted in Linear_5s_11s format.

Fault Responses Input Voltage (SVIN)

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS

NVM

DEFAULT

VALUE

VIN_OV_FAULT_RESPONSE

0x56

Action to be taken by the device when an SVIN

input supply overvoltage fault is detected.

R/W Byte

Reg

0x80

VIN_OV_FAULT_RESPONSE

The VIN_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an (SVIN) input

overvoltage 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

• Set the INPUT bit in the upper byte of the STATUS_WORD

• Sets the SVIN Overvoltage Fault bit in the STATUS_INPUT command, and

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

This command has one data byte.

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