LTC2972 datasheet(68/112 Pages) LINER

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LTC2972

2972fa

For more information www.linear.com/LTC2972

MFR_FAULTB0_RESPONSE and MFR_FAULTB1_RESPONSE Data Contents

BIT(S) SYMBOL

OPERATION

b[7:2] Reserved

Read only, always returns 000000b.

b[1]

Mfr_faultb0_response_chan1,

Mfr_faultb1_response_chan1

Channel 1 response.

0: The channel continues operation without interruption

1: The channel shuts down if the corresponding FAULTB pin is still asserted after 10µs. When the FAULTB pin

subsequently de-asserts, the channel turns back on, honoring TON_DELAY and TON_RISE settings.

b[0]

Mfr_faultb0_response_chan0,

Mfr_faultb1_response_chan0

Channel 0 response.

0: The channel continues operation without interruption

1: The channel shuts down if the corresponding FAULTB pin is still asserted after 10µs. When the FAULTB pin

subsequently de-asserts, the channel turns back on, honoring TON_DELAY and TON_RISE settings.

FAULT WARNING AND STATUS

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED FORMAT UNITS EEPROM

DEFAULT

VALUE

REF

PAGE

CLEAR_FAULTS

0x03 Clear any fault bits that have been set.

Send Byte

STATUS_BYTE

0x78 One byte summary of the unit’s fault condition.

R Byte

Reg

STATUS_WORD

0x79 Two byte summary of the unit’s fault condition.

R Word

Reg

STATUS_VOUT

0x7A Output voltage fault and warning status.

R Byte

Reg

STATUS_IOUT

0x7B Output current fault and warning status.

R Byte

Reg

STATUS_INPUT

0x7C Input supply fault and warning status.

R Byte

Reg

<OV>

STATUS_TEMPERATURE

0x7D External temperature fault and warning status

for READ_TEMPERATURE_1.

R Byte

Reg

STATUS_CML

0x7E Communication and memory fault and warning

status.

R Byte

Reg

STATUS_MFR_SPECIFIC

0x80 Manufacturer specific fault and state

information.

R Byte

Reg

MFR_PADS

0xE5 Current state of selected digital I/O pads.

R/W Word

Reg

MFR_COMMON

0xEF Manufacturer status bits that are common

across multiple ADI chips.

R Byte

Reg

MFR_FIRST_FAULT

0xB6 First fault information

R Word

Reg

MFR_STATUS_2

0xB7 Manufacturer Specific Status

R Word

Reg

CLEAR_FAULTS

The CLEAR_FAULTS command is used to clear status bits that have been set. This command clears all fault and warn-

ing bits in all unpaged status registers, and paged status registers selected by the current PAGE setting. At the same

time, the device negates (clears, releases) its contribution to ALERTB.

The CLEAR_FAULTS command does not cause a unit that has latched off for a fault condition to restart. See Clearing

Latched Faults for more information.

If the fault is present after the fault is cleared, the fault status bit will be set again and the host notified by the usual means.

Note: this command responds to the global page command. (PAGE=0xFF)

PMBus COMMAND DESCRIPTION

LTC2972 Datasheet(PDF) 68 Page - Linear Technology

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