L6751B datasheet(49/58 Pages) STMICROELECTRONICS

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L6751B

PMBus support (preliminary)

Doc ID 024028 Rev 1

49/58

PMBus support (preliminary)

The L6751B is compatible with PMBus™ standard revision 1.1, refer to PMBus standard

documentation for further information (www.pmbus.org).

Table 16.

Supported commands

Command

Per

Rail

Code

[Hex]

Mode

Comments

OPERATION

RW Byte

Used to turn the controller on/off in conjunction with the input

from the control pin. Also used to set margin voltages. Soft off

not supported

ON_OFF_CONFIG

RW Byte

Configures how the controller responds when power is

applied

WRITE_PROTECT

RW Byte

Controls writing to the PMBus device to prevent accidental

changes

VOUT_COMMAND

RW Word

Causes the converter to set its output voltage to the

commanded value - VID mode

VOUT_MAX

RW Word

Sets the upper limit on the output voltage regardless of any

other command

VOUT_MARGIN_HIGH

RW Word

Sets the voltage to which the output is to be changed when

the OPERATION command is set to “margin high”

VOUT_MARGIN_LOW

RW Word

Sets the voltage to which the output is to be changed when

the OPERATION command is set to “margin low”

IOUT_CAL_OFFSET

RW Word Calibration for IOUT reading

OT_FAULT_LIMIT

RW Word Overtemperature fault threshold

OT_WARN_LIMIT

RW Word Overtemperature warning threshold

VIN_OV_FAULT_LIMIT

RW Word Input voltage monitor overvoltage limit

VIN_UV_FAULT_LIMIT

RW Word Input voltage monitor undervoltage limit

MFR_SPECIFIC_01

RW Byte

AVERAGE_TIME_SCALE. Sets the time between two

measurements

MFR_SPECIFIC_02

RW Byte

DEBUG_MODE. [01/10] Switches [ON/OFF] the Vout control

on PMBus domain

MFR_SPECIFIC_05

RW Byte

VOUT_TRIM. Used to apply a fixed offset voltage to the

output voltage command value

MFR_SPECIFIC_08

RW Byte

VOUT_DROOP. Used to change the Vout droop

MFR_SPECIFIC_35

RW Byte

MANUAL_PHASE_SHEDDING. Used to manage the phase

shedding manually

MFR_SPECIFIC_38

RW Byte

VOUT_OV_FAULT_LIMIT. Allows the OV protection threshold

to be programmed for each rail

MFR_SPECIFIC_39

RW Byte

VFDE_ENABLE

MFR_SPECIFIC_40

RW Byte

ULTRASONIC_ENABLE

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