ISL68124IRAZ datasheet(19/46 Pages) RENESAS

19 / 46 page

ISL68124

FN8796 Rev.2.00

Page 19 of 46

June 16, 2017

PMBus Operation

The ISL68124 PMBus slave address is pin selectable using the

ADDRESS pin and resistor value described in Table 2 on page 11.

For proper operation, users should follow the PMBus protocol, as

shown in “PMBus Protocol” on page 20. The supported PMBus

addresses are in 8-bit format (including write and read bit),

shown in Table 5. The least significant bit of the 8-bit address is

for write (0h) and read (1h). PMBus commands are in the range

from 0x00h to 0xFFh. For the ISL68124, Page 0 corresponds to

Output 0 and Page 1 to Output 1. For reference purposes, the

7-bit format addresses are also summarized in Table 5.

The PMBus data formats follow PMBus specification version 1.3

and SMBus version 2.0.

Basic PMBus telemetry commands are summarized in “PMBus

Command Summary” on page 21.

CSx

CSRTNx

Yes

Treat each of the current sense pairs as

differential signals in the PCB layout. They

should be routed side by side on the same

layer. They should not be routed in

proximity to noisy signals like PWM or

Phase. Proper routing of current sense is

perhaps the most critical of all the layout

tasks. Tie to ground when not used.

GND

Yes

This EPAD is the return of PWM output

drivers. Use four or more vias to directly

connect the EPAD to the power ground

plane.

General

Comments

The layer next to the top or bottom layer is

preferred to be ground layers, while the

signal layers can be sandwiched in the

ground layers if possible.

TABLE 4. PIN DESIGN AND/OR LAYOUT CONSIDERATIONS (Continued)

PIN NAME

NOISE

SENSITIVE

DESCRIPTION

TABLE 5. PMBus 8-BIT AND 7-BIT FORMAT ADDRESS (HEX)

8-BIT

7-BIT

8-BIT

7-BIT

8-BIT

7-BIT

8-BIT

7-BIT

80/81

A0/A1

B0/B1

C0/C1

82/83

A2/A3

B2/B3

C2/C3

84/85

A4/A5

B4/B5

C4/C5

86/87

A6/A7

B6/B7

C6/C7

88/89

A8/A9

B8/B9

C8/C9

8A/8B

AA/AB

BA/BB

CA/CB

8C/8D

AC/AD

BC/BD

CC/CD

8E/8F

AE/AF

BE/BF

CE/CF

FIGURE 26. SIMPLIFIED PMBus INITIALIZATION TIMING DIAGRAM

1.2V

VCC

ENABLE

~30ms

VCCS

INDEFINITELY

PMBus

COMMAND

PMBus

COMMAND

PMBus

COMMAND

PMBus

COMMAND

VOUT

PROGRAM CONFIGURATION

(BT, TMAX, PS, DE, etc.)

PROGRAM CONFIGURATION

(BT, TMAX, PS, DE, etc.)

USE PREVIOUS PROGRAMMED

CONFIGURATION FOR STAR-UP AND OPERATION

VCCS

3.3V

POR

PLL

LOCKED

Fac

LOAD

Config

Tel ADC

Initialized

Start-up

Diagnostics

DONE

Customer

Config

LOAD

PROGRAM CONFIGURATION

(BT, TMAX, PS, DE, etc.)

ISL68124IRAZ Datasheet(PDF) 19 Page - Renesas Technology Corp

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