L6759D datasheet(42/51 Pages) STMICROELECTRONICS

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PMBus support

L6759D

42/51

Doc ID 023240 Rev 1

PMBus support

The L6759D is compatible with PMBus™ standard revision 1.1, refer to PMBus standard

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

Table 11.

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 it's 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

measures.

MFR_SPECIFIC_02

RW byte

DEBUG_MODE. [01/10] Switch [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 programming of the OV

protection threshold for each rail.

MFR_SPECIFIC_39

RW byte

VFDE_ENABLE.

MFR_SPECIFIC_40

RW byte

ULTRASONIC_ENABLE.

MFR_SPECIFIC_41

RW byte

GDC_THRESHOLD. To access the internal register to set

GDC threshold [A]

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