LTC3882_15 Datasheet, PDF (94/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

LTC3882
PMBus COMMAND DETAILS (Fault Response and Communication)
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 continues to operate indefinitely with the normal hardware response described in the Operation section.
0x80 The LTC3882 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 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.
3882f
94
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