LTM4675 datasheet(76/128 Pages) LINER

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LTC3884/LTC3884-1

3884fe

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PMBus COMMAND DETAILS

A shortCycle event occurs whenever the PWM channel is commanded back ON, or reactivated, after the part has been

commanded OFF and is processing either the TOFF_DELAY or the TOFF_FALL states. The PWM channel can be turned

ON and OFF through either the RUN pin and or the PMBus OPERATION command.

If the PWM channel is reactivated during the TOFF_DELAY, the part will perform the following:

1. Immediately tri-state the PWM channel output;

2. Start the retry delay timer as specified by the tOFF(MIN).

3. After the tOFF(MIN) value has expired, the PWM channel will proceed to the TON_DELAY state and the STATUS_

MFR_SPECIFIC bit #1 will assert.

If the PWM channel is reactivated during the TOFF_FALL, the part will perform the following:

1. Stop ramping down the PWM channel output;

2. Immediately tri-state the PWM channel output;

3. Start the retry delay timer as specified by the tOFF(MIN).

4. After the tOFF(MIN) value has expired, the PWM channel will proceed to the TON_DELAY state and the STATUS_

MFR_SPEFIFIC bit #1 will assert.

If the SHORT Cycle event occurs and the ShortCycle MFR_CHAN_CONFIG bit is not set, the PWM channel state machine

will complete its TOFF_DELAY and TOFF_FALL operations as previously commanded by the user.

MFR_CONFIG_ALL

General purpose configuration command common to multiple ADI products.

BIT MEANING

Enable Fault Logging.

Ignore Resistor Configuration Pins.

Mask PMBus, PartII, Section 10.9.1 Violations.

Disable SYNC output.

Enable 255ms PMBus timeout.

PMBus command writes require a valid Packet Error Checking, PEC, byte to be accepted.*

Enable the use of PMBus clock stretching.

Execute CLEAR_FAULTS on rising edge of either RUN pin.

*PMBus command writes that have a valid PEC byte are always processed. PMBus command

writes that have an invalid PEC byte are not processed and set a CML status fault.

This command has one data byte.

ON/OFF/MARGIN

COMMAND NAME

CMD

CODE

DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

ON_OFF_CONFIG

0x02

RUN pin and PMBus bus on/off command configuration. R/W Byte

Reg

0x1E

OPERATION

0x01

Operating mode control. On/off, margin high and margin

low.

R/W Byte

Reg

0x80

MFR_RESET

0xFD

Commanded reset without requiring a power-down.

Send Byte

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