LTM4686BIVPBF datasheet(100/130 Pages) AD

100 / 130 page

LTM4686B

100

Rev. 0

For more information www.analog.com

APPENDIX C: PMBUS COMMAND DETAILS

Fault Responses Output Voltage

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

VOUT_OV_FAULT_RESPONSE

0x41

Action to be taken by the device when an

output overvoltage fault is detected.

R/W Byte

Reg

0x80

VOUT_UV_FAULT_RESPONSE

0x45

Action to be taken by the device when an

output undervoltage fault is detected.

R/W Byte

Reg

0xB8

TON_MAX_FAULT_

RESPONSE

0x63

Action to be taken by the device when a

TON_MAX_FAULT event is detected.

R/W Byte

Reg

0xB8

VOUT_OV_FAULT_RESPONSE

The VOUT_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an output

overvoltage fault. The data byte is in the format given in Table 24.

The device also:

• Sets the VOUT_OV bit in the STATUS_BYTE

• Sets the VOUT bit in the STATUS_WORD

• Sets the VOUT Overvoltage Fault bit in the STATUS_VOUT command

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

The only value recognized for this command are:

0x80–The device shuts down (disables the output) and the unit does not attempt to retry. The output remains disabled

until the fault is cleared (PMBus, Part II, Section 10.7).

0xB8–The device shuts down (disables the output) and device attempts retry 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.

0x4n The device shuts down and the unit does not attempt to retry. The output remains disabled until the part is com-

manded OFF then ON or the RUN pin is asserted low then high or MFR_RESET or RESTORE_USER_ALL through the

command or removal of SVIN. The OV fault must remain active for a period of n • 10µs, where n is a value from 0 to 7.

0x78+n The device shuts down and the unit attempts to retry continuously until either the fault condition is cleared or

the part is commanded OFF then ON or the RUN pin is asserted low then high or MFR_RESET or RESTORE_USER_ALL

through the command or removal of SVIN. The OV fault must remain active for a period of n • 10µs, where n is a value

from 0 to 7.

Any other value will result in a CML fault and the write will be ignored.

This command has one data byte.

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