LTM4686BEVPBF datasheet(125/130 Pages) AD

125 / 130 page

LTM4686B

125

Rev. 0

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APPENDIX C: PMBUS COMMAND DETAILS

Table 31. Explanation of Position_Fault Values

POSITION_FAULT VALUE

SOURCE OF FAULT LOG

0xFF

MFR_FAULT_LOG_STORE

0x00

TON_MAX_FAULT Channel 0

0x01

VOUT_OV_FAULT Channel 0

0x02

VOUT_UV_FAULT Channel 0

0x03

IOUT_OC_FAULT Channel 0

0x05

OT_FAULT Channel 0

0x06

UT_FAULT Channel 0

0x07

VIN_OV_FAULT Channel 0

0x0A

MFR_OT_FAULT Channel 0

0x10

TON_MAX_FAULT Channel 1

0x11

VOUT_OV_FAULT Channel 1

0x12

VOUT_UV_FAULT Channel 1

0x13

IOUT_OC_FAULT Channel 1

0x15

OT_FAULT Channel 1

0x16

UT_FAULT Channel 1

0x17

VIN_OV_FAULT Channel 1

0x1A

MFR_OT_FAULT Channel 1

Fault Logging

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

MFR_FAULT_LOG

0xEE Fault log data bytes. This sequentially retrieved data is

used to assemble a complete fault log.

R Block

MFR_FAULT_LOG_ STORE

0xEA Command a transfer of the fault log from RAM to

EEPROM.

Send Byte

MFR_FAULT_LOG_CLEAR

0xEC Initialize the EEPROM block reserved for fault logging. Send Byte

MFR_FAULT_LOG

The MFR_FAULT_LOG command allows the user to read the contents of the FAULT_LOG after the first fault occurrence

since the last MFR_FAULT_LOG_CLEAR command was last written. The contents of this command are stored in non-

volatile memory, and are cleared by the MFR_FAULT_LOG_CLEAR command. The length and content of this command

are listed in Table 30. If the user accesses the MFR_FAULT_LOG command and no fault log is present, the command

will return a data length of 0. If a fault log is present, the MFR_FAULT_LOG will always return a block of data 147 bytes

long. If a fault occurs within the first second of applying power, some of the earlier pages in the fault log may not contain

valid data.

NOTE: The approximate transfer time for this command is 3.4ms using a 400kHz clock.

This read-only command is in block format.

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