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LTC2972

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MFR_STATUS_2

This command returns additional manufacturer specific fault and state information. Bits marked Sticky = Yes are set

by the appropriate event and not cleared until the user issues a CLEAR_FAULTS command or turns the channel back

on. Bits marked ALERT = YES assert ALERTB low when they are set. Bits marked Channel = All are not paged.

MFR_STATUS_2 Data Contents

BIT(S) SYMBOL

OPERATION

STICKY ALERT CHANNEL

b[15:3] Mfr_status_2_reserved

Read only, always returns 0.

b[2]

Mfr_status_2_shortcycle_fault 1: This channel was commanded on by user before it finished sequencing off.

0: No short cycle fault has occurred on this channel.

Yes

Current

Page

b[1]

Mfr_status_2_vinen_drive

1: AUXFAULTB pad is being driven low by this chip.

0: AUXFAULTB pad is not being driven low by this chip.

All

b[0]

Mfr_status_2_vin_caused_off 1: This channel was turned off due to VIN_SNS dropping below the VIN_OFF

threshold.

0: VIN_SNS has not caused this channel to turn off.

Yes

Current

Page

MFR_FIRST_FAULT

The MFR_FIRST_FAULT register contains a value that indicates the first observed fault by the LTC2972 that caused a

channel to fault off. This value is stored in the fault log and is cleared to 0x0000 by sending either the CLEAR_FAULTS

command or cycling a channel off then on. This register will capture the first observed fault regardless of whether fault

logging is enabled. The LTC2972 will store an additional byte into the fault log, FirstFaultTime, that is a snapshot copy

of the least significant 8 bits of the shared-timer value at the time the first fault was detected. Using the FirstFaultTime

value a user can pinpoint a first fault occurrence to within 200µs of all LTC2972 devices with connected SHARE_CLK

pins. The FirstFaultTime value will be reset whenever the MFR_FIRST_FAULT is cleared.

MFR_FIRST_FAULT Data Contents

BIT(S)

SYMBOL

OPERATION

b[15:12]

Mfr_first_fault_page

The page of the first observed fault:

0xF: Global

0x1: Channel 1

0x0: Channel 0

All other values reserved

b[11:8]

Mfr_first_fault_bit_num

Bit number of the status register indicated by Mfr_first_fault_cmd that contains the first observed

fault condition

b[7:0]

Mfr_first_fault_cmd

The PMBus command of the status register that contains the first observed fault condition:

0x80: STATUS_MFR_SPECIFIC

0x7D: STATUS_TEMPERATURE

0x7C: STATUS_INPUT

0x7A: STATUS_VOUT

0x00: None

All other values reserved

PMBus COMMAND DESCRIPTION

LTC2972 Datasheet(PDF) 74 Page - Linear Technology

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