LM5056APMHESLASHNOPB datasheet(33/46 Pages) TI

33 / 46 page

LM5056, LM5056A

www.ti.com

SNVS827A – OCTOBER 2012 – REVISED APRIL 2013

MFR_SPECIFIC_17: MFR_READ_DIAGNOSTIC_WORD (E1h)

The MFR_READ_DIAGNOSTIC_WORD PMBus command reports all of the LM5056/LM5056A faults and

warnings in a single read operation. The standard response to the assertion of the SMBA signal of issuing

multiple read requests to various status registers can be replaced by a single word read to the

MFR_DIAGNOSTIC_WORD register. The MFR_READ_DIAGNOSTIC_WORD command should be read with the

PMBus

Read

Word

protocol.

The

MFR_READ_DIAGNOSTIC_WORD

also

returned

the

MFR_BLOCK_READ, MFR_BLACK_BOX_READ, and MFR_AVG_BLOCK_READ operations.

Table 36. MFR_DIAGNOSTIC_WORD Format

BIT

MEANING

DEFAULT

VOUT under-voltage warn

Over-current warn or over-power warn

VIN under-votlage warn

VIN over-voltage warn

Not supported, always 1

Over-temperature warn

Not supported, always 0

CONFIG_PRESET

Not supported, always 0

CML_FAULT

Not supported, always 0

MFR_SPECIFIC_18: MFR_AVG_BLOCK_READ (E2h)

The MFR_AVG_BLOCK_READ command concatenates the MFR_DIAGNOSTIC_WORD with input and output

average telemetry information (IIN, VOUT, VIN, PIN) as well as temperature to capture all of the operating

information of the part in a single PMBus transaction. The block is 12 bytes long with telemetry information being

sent out in the same manner as if an individual READ_AVG_XXX command had been issued (shown below).

MFR_AVG_BLOCK_READ also ensures that the VIN, VOUT, and IIN measurements are all time-aligned

whereas there is a chance they may not be if read with individual PMBus commands. To read data from the

MFR_AVG_BLOCK_READ command, use the SMBus Block Read protocol.

Table 37. MFR_AVG_BLOCK_READ Register Format

BYTE COUNT (ALWAYS 12)

(1 BYTE)

MFR_DIAGNOSTIC_WORD

(1 word)

AVG_IIN

(1 word)

AVG_VOUT

(1 word)

AVG_VIN

(1 word)

AVG_PIN

(1 word)

TEMPERATURE

(1 word)

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