ISL68147IRAZ datasheet(20/47 Pages) RENESAS

20 / 47 page

ISL68147

FN8880 Rev.2.00

Page 20 of 47

Jul 14, 2017

PMBus Operation

The ISL68147 PMBus slave address is pin selectable, using the

SA pin and resistor value described in Table 2 on page 12. For

proper operation, users should follow the PMBus protocol, as

shown in “PMBus Protocol” on page 21. The supported PMBus

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

80-8E, A0-AE, B0-BE, and C0-CE. 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 ISL68147, 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 22.

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

88/89

A8/A9

B8/B9

C8/C9

8A/8B

AA/AB

BA/BB

CA/CB

FIGURE 27. 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 STARTUP AND OPERATION

VCCS

3.3V

POR

PLL

LOCKED

Fac

LOAD

Config

Tel ADC

Initialized

Startup

Diagnostics

DONE

Customer

Config

LOAD

PROGRAM CONFIGURATION

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

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