LTM4677 datasheet(90/110 Pages) AD

90 / 110 page

LTC3888-1

Rev. 0

For more information www.analog.com

STATUS_BYTE

The STATUS_BYTE command returns a one-byte summary of the most critical faults.

STATUS_BYTE Message Contents:

BIT

STATUS BIT NAME

MEANING

BUSY

A fault was declared because the device was unable to respond.

OFF

This bit is set if the channel is not providing power to its output, regardless of the reason, including simply not

being enabled.

VOUT_OV

An output overvoltage or power stage fault has occurred. Also set if open VSENSE+ is detected.

IOUT_OC

An output overcurrent fault has occurred.

VIN_UV

Not supported (device returns 0).

TEMPERATURE

A temperature fault or warning has occurred. (LTC3888-1 only)

CML

A communications, memory or logic fault has occurred.

NONE OF THE ABOVE A fault Not listed in bits[7:1] has occurred.

*ALERT can be asserted if this bit is set. It may be cleared by writing a 1 to that bit position in the STATUS_BYTE, in lieu of a CLEAR_FAULTS command.

This command has one data byte.

STATUS REPORTING

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

STATUS_BYTE

0x78 One-byte channel status summary.

R/W Byte

Reg

STATUS_WORD

0x79 Two-byte channel status summary.

R/W Word

Reg

STATUS_VOUT

0x7A VOUT fault and warning status.

R/W Byte

Reg

STATUS_IOUT

0x7B IOUT fault and warning status.

R/W Byte

Reg

STATUS_INPUT

0x7C Input supply fault and warning status.

R/W Byte

Reg

STATUS_TEMPERATURE

0x7D External temperature fault and warning

status.

R/W Byte

Reg

STATUS_CML

0x7E Communication, memory and logic fault and

warning status.

R/W Byte

Reg

STATUS_MFR_SPECIFIC

0x80 IC-specific status.

R/W Byte

Reg

MFR_PADS_LTC3888-1

0xE5 State of selected LTC3888-1 pads.

R Word

Reg

MFR_COMMON

0xEF ADI-generic device status reporting.

R Byte

Reg

MFR_INFO

0xB6 Manufacturer-specific information

R Word

Reg

CLEAR_FAULTS

0x03 Clear all set fault bits.

Send Byte

Refer to Figure 2 for a graphical depiction of these register contents and their relationships. Refer to Power Stage Selection and Interface in the

Applications Information section for details of special status reporting related to external power stages that is supported by the LTC3888-1.

PMBus COMMAND DETAILS (Status Reporting)

LTM4677 Datasheet(PDF) 90 Page - Analog Devices

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