LTM4677 datasheet(100/110 Pages) AD

100 / 110 page

LTC3888-1

100

Rev. 0

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VOUT_OV_FAULT_RESPONSE

The VOUT_OV_FAULT_RESPONSE command reports the actions the device will take in response to an output over-

voltage fault, power stage fault or qualified UVLO (LTC3888-1 only) or qualified VDR supply UV during operation. The

format for this command is given in Table 13. The device also:

• Sets the VOUT_OV Bit in the STATUS_BYTE

• Sets the VOUT Bit in the STATUS_WORD

• Sets the VOUT Overvoltage Fault Bit in the STATUS_VOUT Command

• Notifies the Host by Asserting ALERT, Unless Masked

This read-only command has one data byte.

VOUT_UV_FAULT_RESPONSE

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

undervoltage fault. The format for this command is given in Table 13. The device also:

• Sets the VOUT Bit in the STATUS_WORD

• Sets the VOUT Undervoltage Fault Bit in the STATUS_VOUT Command,

• Notifies the Host by Asserting ALERT, Unless Masked

This command has one data byte.

Table 13. Data Byte Contents for VOUT_OV_FAULT_RESPONSE and VOUT_UV_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_VOUT 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.

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].

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

[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, or IC

supply power is removed, or another fault response forces

shutdown without retry.

[2:0]

Delay time.

xxx

Response delay time in 10µs increments. This delay

time determines how long the fault may have to persist

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

Hardware-level response, if any, will occur during this delay.

PMBus COMMAND DETAILS (Fault Response and Communication)

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