LTM4677 datasheet(90/116 Pages) AD

90 / 116 page

LTC3883/LTC3883-1

Rev. F

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This condition is detected by the ADC so the response time may be up to 80ms.

This command has one data byte.

UT_FAULT_RESPONSE

The UT_FAULT_RESPONSE command instructs the device on what action to take in response to an external under-

temperature fault on the external temp sensors. The data byte is in the format given in Table 9.

The device also:

• Sets the TEMPERATURE bit in the STATUS_BYTE

• Sets the Undertemperature Fault bit in the STATUS_TEMPERATURE command, and

• Notifies the host by asserting ALERT pin

This condition is detected by the ADC so the response time may be up to 80ms.

This command has one data byte.

Table 9. Data Byte Contents: TON_MAX_FAULT_RESPONSE, VIN_OV_FAULT_RESPONSE,

OT_FAULT_RESPONSE, UT_FAULT_RESPONSE

BITS

DESCRIPTION

VALUE

MEANING

7:6

Response

For all values of bits [7:6], the LTC3883:

• Sets the corresponding fault bit in the status commands, and

• Notifies the host by asserting ALERT pin

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

• Bias power is removed and reapplied to the LTC3883

The PMBus device continues operation without interruption.

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

The device shuts down 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

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

XXX

Not supported. Values ignored

FAULT SHARING

Fault Sharing Propagation

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

DATA

FORMAT

UNITS

NVM

DEFAULT

VALUE

MFR_GPIO_

PROPAGATE_LTC3883

0xD2

Configuration that determines which faults are

propagated to the GPIO pin.

R/W Word

Reg

0x2993

PMBus COMMAND DETAILS

LTM4677 Datasheet(PDF) 90 Page - Analog Devices

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