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LTC3882-1

Rev A

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OT_FAULT_RESPONSE

The OT_FAULT_RESPONSE command instructs the device on what action to take in response to an overtemperature

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

• Sets the TEMPERATURE Bit in the STATUS_BYTE

• Sets the Overtemperature Fault Bit in the STATUS_TEMPERATURE Command

• Notifies the Host by Asserting ALERT, Unless Masked

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 undertemperature

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

• Sets the TEMPERATURE Bit in the STATUS_BYTE

• Sets the Undertemperature Fault Bit in the STATUS_TEMPERATURE Command

• Notifies the Host by Asserting ALERT, Unless Masked

This command has one data byte.

MFR_OT_FAULT_RESPONSE

The MFR_OT_FAULT_RESPONSE command instructs the device on what action to take in response to an internal

overtemperature fault (150°C to 160°C). The device also:

• Sets the MFR Bit in the STATUS_WORD

• Sets the Overtemperature Fault Bit in the STATUS_MFR_SPECIFIC Command

• Notifies the Host by Asserting ALERT, Unless Masked

Supported Values:

VALUE

MEANING

0xC0

The LTC3882-1 continues to operate indefinitely with the normal hardware response described in the Operation section.

0x80

The LTC3882-1 shuts down immediately and does not attempt to restart. The output remains disabled until the fault is cleared and the unit

is commanded off and then on, or bias power (LTC3882-1 power supply input) is cycled.

Programming an unsupported MFR_OT_FAULT_RESPONSE value will generate a CML fault and the command will be

ignored.

This command has one data byte.

PMBus COMMAND DETAILS (Fault Response and Communication)

LTC4449 Datasheet(PDF) 97 Page - Linear Technology