LTC2977 datasheet(109/138 Pages) AD

109 / 138 page

LTM4664A

109

Rev. 0

For more information www.analog.com

PMBus COMMAND DETAILS

Fault Responses Input Voltage

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS

NVM

DEFAULT

VALUE

VIN_OV_FAULT_RESPONSE

0x56

Action to be taken by the device when an

input supply overvoltage fault is detected.

R/W Byte

Reg

0x80

VIN_OV_FAULT_RESPONSE

The VIN_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an input over-

voltage fault. The data byte is in the format given in Table 17.

The device also:

• Sets the NONE_OF_THE_ABOVE bit in the STATUS_BYTE

• Set the INPUT bit in the upper byte of the STATUS_WORD

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

• Notifies the host by asserting ALERT pin, unless masked

This command has one data byte.

Fault Responses Output Voltage

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

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 13.

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, unless masked

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).

LTC2977 Datasheet(PDF) 109 Page - Analog Devices

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