LTM4677 datasheet(105/110 Pages) AD

105 / 110 page

LTC3888-1

105

Rev. 0

For more information www.analog.com

PMBus COMMAND DETAILS (Fault Response and Communication)

BIT

PROPAGATED CONDITION

OT_FAULT_LIMIT exceeded.

(Reserved).

VIN_OV_FAULT_LIMIT exceeded.

(Reserved).

IOUT_OC_FAULT_LIMIT exceeded.

VOUT_UV_FAULT_LIMIT exceeded

VOUT_OV_FAULT_LIMIT exceeded, power stage fault or UV, or VDR monitor UV

*If this bit is set, MFR_FAULT_RESPONSE should be set to ignore (0x00), otherwise the rail might not start.

This command has two data bytes.

MFR_FAULT_RESPONSE

The MFR_FAULT_RESPONSE command instructs the device on what action to take in response to a FAULT pin being

pulled low externally.

Supported Values:

VALUE

MEANING

0xC0

Related rail is immediately disabled.

0x00

Input ignored, PWM operation continues without interruption.

When a FAULT pin is pulled low externally, the device also:

• Sets the MFR_SPECIFIC Bit in the STATUS_WORD

• Sets Bit 0 in the STATUS_MFR_SPECIFIC Command to Indicate FAULT Is or Has Been Pulled Low

• Notifies the Host by Asserting ALERT, Unless Masked

This command has one data byte.

MFR_FAULT_LOG

The MFR_FAULT_LOG command allows the contents of the fault log to be read. This log is created with MFR_FAULT_

LOG_STORE or at the first fault occurrence after an MFR_FAULT_LOG_CLEAR. If a fault occurs within the first second

after applying power, some earlier pages in the log may not contain valid data.

This read-only command uses block protocol with 147 bytes of data requiring an estimated data transfer time of 3.4ms

at 400kHz. The tTIMEOUT parameter is extended when this command is executed and a fault log is present.

Refer to Fault Log Details in the Operation section for complete information on using the LTC3888-1 fault log.

MFR_FAULT_LOG_CLEAR

The MFR_FAULT_LOG_CLEAR command erases all stored fault log values. After a clear is issued, up to 8ms may be

required to clear related bit 3 in STATUS_MFR_SPECIFIC.

This write-only command has no data bytes.

LTM4677 Datasheet(PDF) 105 Page - Analog Devices

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