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LTC2972

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MFR_FAULTB0_PROPAGATE and MFR_FAULTB1_PROPAGATE

These manufacturer specific commands enable channels that have faulted off to propagate that state to the appropri-

ate fault pin. MFR_FAULTB0_PROPAGATE allows any channel’s faulted off state to propagate to the FAULTB0 pin.

MFR_FAULTB1_PROPAGATE allows any channel’s faulted off state to propagate to the FAULTB1 pin.

Note that pulling a fault pin low will have no effect for channels that have MFR_FAULTBn_RESPONSE set to 0. The

channel continues operation without interruption. This fault response is called Ignore (0x0) in LTpowerPlay.

MFR_FAULT0_PROPAGATE Data Contents

BIT(S) SYMBOL

OPERATION

b[7:1] Reserved

Don’t care. Always returns 0.

b[0]

Mfr_faultb0_propagate Enable fault propagation.

0: Channel’s faulted off state does not assert FAULTB0 low.

1 :Channel’s faulted off state asserts FAULTB0 low.

MFR_FAULT1_PROPAGATE Data Contents

BIT(S) SYMBOL

OPERATION

b[7:1] Reserved

Don’t care. Always returns 0.

b[0]

Mfr_faultb1_propagate Enable fault propagation.

0: Channel’s faulted off state does not assert FAULTB1 low.

1: Channel’s faulted off state asserts FAULTB1 low.

MFR_FAULTB0_RESPONSE and MFR_FAULTB1_RESPONSE

These manufacturer specific commands share the same format and specify the response to assertions of the FAULTB

pins. MFR_FAULTB0_RESPONSE determines which channels shut off when the FAULTB0 pin is asserted low and

MFR_FAULTB1_RESPONSE determines which channels shut off when the FAULTB1 pin is asserted low. When a

channel shuts off in response to a FAULTBn pin, the ALERTB pin is asserted low and the appropriate bit is set in the

STATUS_MFR_SPECIFIC register. For a graphical explanation, see the switches on the left hand side of Figure 31:

Channel Fault Management Block Diagram.

Faults will not propagate for channels that have MFR_FAULTBn_RESPONSE set to 0: The channel continues operation

without interruption. Note that this fault response is called No Action in LTpowerPlay.

SHARED EXTERNAL FAULTS

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED FORMAT UNITS EEPROM

DEFAULT

VALUE

REF

PAGE

MFR_FAULTB0_PROPAGATE

0xD2

Configuration that determines if a channels

faulted off state is propagated to the

FAULTB0 pin.

R/W Byte

Reg

0x00

MFR_FAULTB1_PROPAGATE

0xD3

Configuration that determines if a channels

faulted off state is propagated to the

FAULTB1 pin.

R/W Byte

Reg

0x00

MFR_FAULTB0_RESPONSE

0xD5

Action to be taken by the device when the

FAULTB0 pin is asserted low.

R/W Byte

Reg

0x00

MFR_FAULTB1_RESPONSE

0xD6

Action to be taken by the device when the

FAULTB1 pin is asserted low.

R/W Byte

Reg

0x00

PMBus COMMAND DESCRIPTION

LTC2972 Datasheet(PDF) 67 Page - Linear Technology

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