LTC2977 datasheet(111/138 Pages) AD

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LTM4664A

111

Rev. 0

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PMBus COMMAND DETAILS

The UV fault and warn are masked until the following criteria are achieved:

1) The TON_MAX_FAULT_LIMIT has been reached

2) The TON_DELAY sequence has completed

3) The TON_RISE sequence has completed

4) The VOUT_UV_FAULT_LIMIT threshold has been reached

5) The IOUT_OC_FAULT_LIMIT is not present

The UV fault and warn are masked whenever the channel is not active.

The UV fault and warn are masked during TON_RISE and TOFF_FALL sequencing.

This command has one data byte.

Table 15. VOUT_UV_FAULT_RESPONSE Data Byte Contents

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.

(Ignores the fault functionally)

The PMBus device continues operation for the delay time

specified by bits [2:0] and the delay time unit specified for

that particular fault. If the fault condition is still present at the

end of the delay time, the unit responds as programmed in the

Retry Setting (bits [5:3]).

The device shuts down (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

000-111 The delay time in 10µs increments. This delay time determines

how long the controller continues operating after a fault is

detected. Only valid for deglitched off state.

LTC2977 Datasheet(PDF) 111 Page - Analog Devices

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