LTM4677 datasheet(101/110 Pages) AD

101 / 110 page

LTC3888-1

101

Rev. 0

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IOUT_OC_FAULT_RESPONSE

The IOUT_OC_FAULT_RESPONSE command instructs the device on what action to take in response to an output

overcurrent fault. The device also:

• Sets the IOUT_OC Bit in the STATUS_BYTE

• Sets the IOUT Bit in the STATUS_WORD

• Sets the IOUT Overcurrent Fault Bit in the STATUS_IOUT Command

• Notifies the Host by Asserting ALERT, Unless Masked

Output overcurrent faults are ignored during turn-on and turn-off output transitions.

Data Byte Contents for IOUT_OC_FAULT_RESPONSE:

BITS

DESCRIPTION

VALUE

MEANING

[7:6]

For all values of bits [7:6], the LTC3888-1:

• Sets the corresponding fault bits in the status commands.

• Notifies the host by asserting ALERT, unless masked.

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

following events occurs:

• The device receives a CLEAR_FAULTS command.

• The corresponding STATUS_IOUT bit is written to a one.

• The output is commanded off, then on, by the RUN pin or

OPERATION command.

• The device receives a RESTORE_USER_ALL command.

• The device receives an MFR_RESET command.

• IC supply power is cycled.

The LTC3888-1 continues to operate indefinitely with the

normal hardware response described in the Operation

section.

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

The LTC3888-1 continues operating with the normal

hardware response for the delay time specified by bits

[2:0]. If the fault is continuously present for the entire delay,

the unit then disables the output and responds according to

the retry setting in bits [5:3].

The LTC3888-1 immediately disables the output and

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

[5:3]

Retry setting.

000-110

The LTC3888-1 does not attempt to restart. The output

remains disabled until the fault is cleared, the device is

commanded off and then on, or IC supply power is cycled.

111

The LTC3888-1 attempts to restart continuously without

limitation with an interval set by MFR_RETRY_DELAY.

This response persists until the unit is commanded off, IC

supply power is removed, or another fault response forces

shutdown without retry.

[2:0]

Delay time.

xxx

Response delay time in 16ms increments. This delay time

determines how long the fault may have to persist before

the controller is disabled, depending on bits [7:6]. These

bits always return zero if bits [7:6].

This command has one data byte.

PMBus COMMAND DETAILS (Fault Response and Communication)

LTM4677 Datasheet(PDF) 101 Page - Analog Devices

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