LTM4686BEVPBF datasheet(105/130 Pages) AD

105 / 130 page

LTM4686B

105

Rev. 0

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APPENDIX C: PMBUS COMMAND DETAILS

This condition is detected by the ADC so the response time may be up to 90ms, typical.

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 a power stage under-

temperature fault. The data byte is in the format given in Table 28.

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, unless masked.

This condition is detected by the ADC so the response time may be up to 90ms, typical.

This command has one data byte.

Table 28. 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 LTM4686B:

• 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 RUNn pin, the OPERATION

command, or the combined action of the RUNn pin and

OPERATION command, to turn off and then to turn back on, or

• Bias power is removed and reapplied to the LTM4686B

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

000–110 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 RUNn 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

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

MFR_GPIO_ PROPAGATEn 0xD2

Configuration that determines which faults are

propagated to the GPIOn pins.

R/W Word

Reg

0x7993

LTM4686BEVPBF 数据表(PDF) 105 Page - Analog Devices

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