LTM4677 datasheet(85/116 Pages) AD

85 / 116 page

LTC3883/LTC3883-1

Rev. F

For more information www.analog.com

PMBus COMMAND DETAILS

• Sets the VIN Overvoltage Fault bit in the STATUS_INPUT command, and

• Notifies the host by asserting ALERT pin

This command has one data byte.

Fault Responses Output Voltage

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

DATA

FORMAT

UNITS

NVM

DEFAULT

VALUE

VOUT_OV_FAULT_RESPONSE

0x41

Action to be taken by the device when an

output overvoltage fault is detected.

R/W Byte

Reg

0xB8

VOUT_UV_FAULT_RESPONSE

0x45

Action to be taken by the device when an

output undervoltage fault is detected.

R/W Byte

Reg

0xB8

TON_MAX_FAULT_

RESPONSE

0x63

Action to be taken by the device when a

TON_MAX_FAULT event is detected.

R/W Byte

Reg

0xB8

VOUT_OV_FAULT_RESPONSE

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

overvoltage fault. The data byte is in the format given in Table 5.

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 pin

The only values recognized for this command are:

0x00–Part performs OV pull down only, or OV_PULLDOWN.

0x80–The device shuts down (disables the output) and the unit does not attempt to retry. (PMBus, Part II, Section 10.7).

0xB8–The device shuts down (disables the output) and device attempts to retry 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.

0x4n The device shuts down and the unit does not attempt to retry. The output remains disabled until the part is com-

manded OFF then ON or the RUN pin is asserted low then high or RESET through the command or removal of VIN.

The OV fault must remain active for a period of n • 10µs, where n is a value from 0 to 7.

0x78+n The device shuts down and the unit attempts to retry continuously until either the fault condition is cleared

or the part is commanded OFF then ON or the RUN pin is asserted low then high or RESET through the command or

removal of VIN. The OV fault must remain active for a period of n • 10µs, where n is a value from 0 to 7.

Any other value will result in a CML fault and the write will be ignored.

This command has one data byte.

LTM4677 Datasheet(PDF) 85 Page - Analog Devices

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