ISL68137IRAZ datasheet(49/54 Pages) RENESAS

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ISL68137

FN8757 Rev.1.00

Page 49 of 54

Jun 26, 2017

Adaptive Voltage Scaling Bus (AVSBus) Functionality and Operation

The AVSBus interface provides a high speed (up to 50MHz) serial interface to the ISL68137, allowing implementation of advanced

voltage scaling functions that support increased system efficiency and performance. Devices equipped with AVSBus master capability

can use the interface to enable rapid supply voltage changes to support low power consumption modes as well as high performance

modes. Due to the advanced digital regulation loop employed, the ISL68137 is well equipped to support very rapid transition rates. All

commands are readable at all times, but they cannot be written unless the device is set to AVSBus control.

AVSBus Master Send Subframe

FUNCTION Start Code R/W

Command Type

Command Code

Rail Select

Command Data

CRC

SIZE (bits) 2

SETTING

01b

00b = Write data

and Commit

11b = Read Data

0b = AVSBus Data 0h = Target Rail Voltage

1h = Transition Rate

2h = Rail Current

3h = Temperature

4h = Voltage Reset

Eh = AVSBus Status

Fh = AVSBus Version

0h = Rail 0

1h = Rail 1

Fh = Broadcast

Read = FFh

Write = See “AVSBus

Command Detail” on

page 50

AVSBus Slave Response Subframe

FUNCTION Slave Ack

Status Response

Command Data

Not used

CRC

SIZE (bits) 2

SETTING

00b = Command

acknowledged, action taken

01b = Command

acknowledged, no action

10b = Bad CRC, no action

11b = Invalid request, no action

Bit 4 = VDONE. Sets to 1 when VOUT

target is reached

Bit 3 = Status alert. Sets to 1 if a bit in

AVSBus Status register (excluding from

VDONE) has set

Bit 2 = AVSBus control. Sets to 1 when

AVSBus control is enabled

Bits 1:0 = Not used

Write = FFh

Read = See “AVSBus

Command Detail” on

page 50

Not used

11111b

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