LTM4677 datasheet(84/116 Pages) AD

84 / 116 page

LTC3883/LTC3883-1

Rev. F

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PMBus COMMAND DETAILS

MFR_RESTART_DELAY

This command specifies the minimum RUN off time in milliseconds. This device will pull the RUN pin low for this length

of time once a falling edge of RUN has been detected. The minimum recommended value is 136ms.

Note: The restart delay is different than the retry delay. The restart delay pulls RUN low for the specified time, after

which a standard start-up sequence is initiated. The minimum restart delay should be equal to TOFF_DELAY + TOFF_

FALL + 136ms. Valid values are from 136ms to 65.52 seconds in 16ms increments. To assure a minimum off time,

set the MFR_RESTART_DELAY 16mS longer than the desired time. The output rail can be off longer than the MFR_

RESTART_DELAY after the RUN pin is pulled high if the output decay bit 0 is enabled in MFR_CHAN_CONFIG_LTC3883

and the output takes a long time to decay below 12.5% of the programmed value.

This command has two data bytes and is formatted in Linear_5s_11s format.

FAULT RESPONSE

Fault Responses All Faults

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

DATA

FORMAT

UNITS

NVM

DEFAULT

VALUE

MFR_RETRY_ DELAY

0xDB

Retry interval during FAULT retry mode.

R/W Word

L11

350

0xFABC

MFR_RETRY_DELAY

This command sets the time in milliseconds between retries if the fault response is to retry the controller at specified

intervals. This command value is used for all fault responses that require retry. The retry time starts once the fault has

been detected by the offending channel. Valid values are from 120ms to 83.88 seconds in 10µs increments.

Note: The retry delay time is determined by the longer of the MFR_RETRY_DELAY command or the time required

for the regulated output to decay below 12.5% of the programmed value. If the natural decay time of the output is

too long, it is possible to remove the voltage requirement of the MFR_RETRY_DELAY command by asserting bit 0 of

MFR_CHAN_CONFIG_LTC3883.

This command has two data bytes and is formatted in Linear_5s_11s format.

Fault Responses Input Voltage

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

DATA

FORMAT

UNITS

NVM

DEFAULT

VALUE

VIN_OV_FAULT_RESPONSE

0x56

Action to be taken by the device when an

input supply overvoltage fault is detected.

R/W Byte

Reg

0x80

VIN_OV_FAULT_RESPONSE

The VIN_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an input over-

voltage fault. The data byte is in the format given in Table 9.

The device also:

• Sets the NONE_OF_THE_ABOVE bit in the STATUS_BYTE

• Set the INPUT bit in the upper byte of the STATUS_WORD

LTM4677 Datasheet(PDF) 84 Page - Analog Devices

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