STPM098C datasheet(75/110 Pages) STMICROELECTRONICS

75 / 110 page

Dynamic VID change can be configured and applied by means of the dedicated PMBus™ command

MFR_SVID_CTRL, which contains several parameters:

Table 59. Dynamic VID control configuration bits

MFR_SVID_CTRL [18:0]

Description

MFR_SVID_CTRL [18]

VID_TRIGGER activation command

0 = No action

1 = VID setpoint change start

MFR_SVID_CTRL [17:16]

VID_MODE: VID slew rate mode

00 = DVID_SR_FAST

01= DVID_SR_SLOW

MFR_SVID_CTRL [15:12]

SLEW_RATE_SELECTOR shift factor for DVID_SR_SLOW

MFR_SVID_CTRL [11:6]

DVID_SR_SLOW

MFR_SVID_CTRL [5:0]

DVID_SR_FAST

Note:

•

MFR_DVID_SR_SELECTOR only effective values are 0x1, 0x2, 0x4, 0x8.

•

MFR_DVID_SR_SELECTOR values 0x2 and 0x0 have equal effect.

VID transition (current to target) slew rate can be configured according to the following equation:

DVIDSR=

VID_DAC_out_lsb

4×Tclk×DVID_SR_slow×MFR_DVID_SLOW_SR_SELECTOR

(32)

Where:

VID_DAC_out _lsb is the minimum voltage step [1.22 mV].

Tclk is the system clock period [25 ns].

DVID_SR_SLOW [11:6] are the dedicated PMBus™ configuration bits.

MFR_DVID_SLOW_SR_SELECTOR is a scaling factor.

Default values are: DVID_SR_SLOW = 0x00, MFR_DVID_SR_SELECTOR = 0x0.

In case VID_MODE = 0x01 the equation above becomes:

DVIDSR= VID_DAC_out_lsb

2×Tclk×DVID_SR_FAST

(33)

Where:

VID_DAC_out _lsb is the minimum voltage step [1.22 mV].

Tclk is the system clock period [25 ns].

DVID_SR_FAST [5:0] are the dedicated PMBus™ configuration bits.

The default value is DVID_SR_FAST [5:0] = 0x00

The loop controller applies the setpoint step up/down as soon as MFR_SVID_CTRL command is issued by

setting VID_TRIGGER field to ‘1’.

Figure 61. DVID transition timing diagram

VSENn

VID_START

MFR_SVID_CTRL

VID_STOP

APPLY

dV/dt = DVID_SR

APPLY

dV/dt = DVID_SR

STPM098C

Functional description

DS14440 - Rev 1

page 75/110

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