MP2935 datasheet(40/42 Pages) MPS

40 / 42 page

MP2935 — 4-PHASE PWM CONTROLLER FOR VR12.5 APPLICATIONS

MP2935 Rev. 1.02

www.MonolithicPower.com

8/25/2015

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

SVID COMMANDS

Table 7: Supported SVID Commands

Command

Master

Payload

Contents

Salve

Payload

Contents

Descriptions

01h

SetVID-Fast

Individual

Address and All

Call Address

VID code

N/A

Set the new VID target. VR transitions to new a VID

target at a controlled (up or down) slew rate programmed

by the VR. When VR receives a VID moving-up

command, it exits all low-power states to the normal state

to ensure the fastest slew rate to the new VR.

02h

SetVID-Slow

Individual

Address and All

Call Address

VID code

N/A

Set the VID target. VR transitions to new a VID target at a

controlled slew rate (up or down) programmed by the VR.

SetVID-Slow is 4x slower than SetVID-Fast. When VR

receives a VID moving-up command it exits all low power

states to the normal state to ensure a slow slew rate to

the new VR.

03h

SetVID-Decay

Individual

ADDRESs and

All

Call Address

VID code

N/A

Sets the VID target, VR transitions to new the VID target,

but does not control the slew rate; the output voltage

decays at a rate proportional to the load current.

SetVID_Decay is only used when VID is falling. VR sets

VR_settled bit, but Alert line is not

04h

SetPS

Individual

Address and All

Call Address

Byte

indicating

power

status of

CPU

N/A

Sends information to VR controller so it can configure VR

to improve efficiency, especially at light load

05h

SetRegADR

Individual

Address Only.

NAK All Call

Address

Address of

the index in

the data

table

N/A

Sets the address pointer in the data register table.

Typically the next command, SetRegDAT, gets loaded

into this address. However for multiple writes to the same

address, use only one SetRegADR.

06h

SetRegDAT

Individual

Address Only.

NAK All Call

Address

New data

contents

N/A

Writes the contents to the data register that was

previously identified by the address pointer with

SetRegADR.

07h

GetReg

Individual

Address Only.

NAK All Call

Address

Define

which

Specified

contents

Slave returns the contents of the specified register as the

payload. See Table 8 for list of registers The majority of

the VR monitoring data is accessed through the GetReg

command.

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