IR3531 datasheet(21/39 Pages) IRF

21 / 39 page

4+1 Phase Dual Output Control IC

IR3531

March 22, 2012 | FINAL | V2.27

When the processor (master) issues a Get command, it

transmits the intended controller address and the address

of the register it wants to read. The addressed controller

acknowledges the command and returns the requested

data. Similarly, when the processor issues a Set command,

it transmits the intended controller address and the data it

wants to insert. The only exception is the SetRegADR

command which is used to declare the register address

that SetRegDAT will alter. The controller acknowledges

these commands. Parity checking is not enforced on

SetRegADR/SetRegDAT.

TABLE 2: SUPPORTED COMMAND

Command

Description

SetVIDfast

Slews VOUT to a new Programmed setpoint at

20mV/usec

SetVIDslow

Slews VOUT to a new Programmed setpoint at

5mV/usec

SetPS

Sets power state

SetRegADR

Declares the address of the register to be

written to

SetRegDAT

Writes data to the SetRegADR declared register

GetReg

Read data of a specified register

TestMode

Test mode is used for final test trimming of the

IR3531 and is not available to users.

Note: SetVID decay is not supported

TABLE 3: SUPPORTED REGISTER

Description

VendorID

Identifies the VR vendor

ProductID

Identifies the product model

ProductRev

Identifies the product revision

SVID Protocol ID

Identifies the version of SVID protocol

VR Capability

Communicates functions the IR3531

supports

Status1 Reg

Stores VR status data

Status2 Reg

Stores SVID bus errors

Temp Zone

Temperature zone from Rail0 sensor

Output Current

Stores output current for Rail0/Rail1

Status2_last_read

Stores previous data of status 2

ICC Max

Programs the maximum supported

output current

Temp Max

Programs maximum operating

temperature

SR-fast

Stores the fast slew rate value

SR-slow

Stores the slow slew rate value

Vboot

Overrides the default Vboot value

Vout Max

Programs the maximum supported

operational Vout

VID Setting

Power State

VID Offset

Allows margining around the VID setpoint

Multi VR Config

Configures other VR-s on the same SVID

bus

SetRegADR

Scratch pad register for temporary

storage of the SetRegADR pointer register

Note 1: VID Offset commands that attempt to push the VID

above 1.52V or below 0V are not acknowledged.

IR3531 Datasheet(PDF) 21 Page - International Rectifier

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