LTC2977 datasheet(115/138 Pages) AD

115 / 138 page

LTM4664A

115

Rev. 0

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PMBus COMMAND DETAILS

This condition is detected by the ADC so the response time may be up to tCONVERT.

This command has one data byte.

Table 18. Data Byte Contents: TON_MAX_FAULT_RESPONSE, VIN_OV_FAULT_RESPONSE,

OT_FAULT_RESPONSE, UT_FAULT_RESPONSE

BITS

DESCRIPTION

VALUE

MEANING

7:6

Response

For all values of bits [7:6], the LTM4664A:

• Sets the corresponding fault bit in the status commands, and

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

The fault bit, once set, is cleared only when one or more of the

following events occurs:

• The device receives a CLEAR_FAULTS command.

• The output is commanded through the RUN pin, the OPERATION

command, or the combined action of the RUN pin and

OPERATION command, to turn off and then to turn back on, or

• The device receives a RESTORE_USER_ALL command.

• The device receives a MFR_RESET command.

• The device supply power is cycled.

The PMBus device continues operation without interruption.

Not supported. Writing this value will generate a CML fault.

The device shuts down immediately (disables the output) and

responds according to the retry setting in bits [5:3].

Not supported. Writing this value will generate a CML fault.

5:3

Retry Setting

000

The unit does not attempt to restart. The output remains

disabled until the fault is cleared until the device is commanded

OFF bias power is removed.

111

The PMBus device attempts to restart 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 without

retry. Note: The retry interval is set by the MFR_RETRY_DELAY

command.

2:0

Delay Time

XXX

Not supported. Values ignored

FAULT SHARING

Fault Sharing Propagation

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS

NVM

DEFAULT

VALUE

MFR_FAULT_

PROPAGATE

0xD2

Configuration that determines which faults

are propagated to the FAULT pins.

R/W Word

Reg

0x6993

MFR_FAULT_PROPAGATE

The MFR_FAULT_PROPAGATE command enables the faults that can cause the FAULTn pin to assert low. The com-

mand is formatted as shown in Table 15. Faults can only be propagated to the FAULTn pin if they are programmed to

respond to faults.

This command has two data bytes.

LTC2977 Datasheet(PDF) 115 Page - Analog Devices

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