ISL8274MEVAL1Z datasheet(63/81 Pages) RENESAS

63 / 81 page

FN8931 Rev.1.00

Page 63 of 81

Jan 4, 2018

ISL8274M

7. PMBus Commands Description

USER_CONFIG (D1h)

Definition: Configures several user-level features. This command overrides the pin-strap settings.

Data Length in Bytes: 1

Data Format: BIT

Type: R/W

Default Value: 84h (Pin-strap setting for ASCR on Start up; ramp-up and ramp-down minimum duty cycle 0.39%;

minimum duty cycle control enabled; PG is an open-drain output.)

Units: N/A

DDC_CONFIG (D3h)

Definition: Configures DDC addressing and current sharing. The DDC rail ID is set according to the SMBus address.

For current sharing applications, the DDC Phase ID is set according to the number of phases. The device position and

number of devices in the rail can be programmed as needed.

Data Length in Bytes: 2

Data Format: BIT

Type: R/W

Default Value: Pin-strap setting for Rail ID. Phase ID = 0; Phases in rail = 1

Units: N/A

Bit

Field Name

Value

Setting

Description

ASCR on for Start

Disabled

ASCR is disabled for start up. Use this for Current Sharing

mode.

Enabled

ASCR is enabled for start up. Use this for Stand Alone

mode.

6:5

Reserved

4:3

Ramp-up and

Ramp-down

Minimum Duty

Cycle

0.39%

Sets the minimum duty-cycle during start-up and shutdown

ramp.

0.78%

1.17%

1.56%

Minimum Duty

Cycle Control

Disable

Control for minimum duty cycle.

Enable

Power-good Pin

Configuration

Open Drain

0 = PG is an open-drain output.

Push-Pull

1 = PG is a push-pull output.

Reserved

Bit

Field Name

Value

Setting

Description

15:13

Phase ID

0 to 7

Sets the phase ID in a current sharing rail.

12:8

Rail ID

0 to 31 (00 to 1Fh)

Configures DDC rail ID

7:3

Reserved

2:0

Phases in Rail

0 to 7

Identifies the number of phases on the same rail (+1).

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