Rainbow-electronics MAX34440 Instrukcja Użytkownika Pobierz pdf (Strona 16)

PMBus 6-Channel Power-Supply Manager

MAX34440

Address Select

On device power-up, the device samples the A0 and A1

pins to determine the PMBus/SMBus serial-port address.

SMBus/PMBus Operation

The device implements the PMBus command structure

using the SMBus format. The structure of the data flow

between the host and the slave is shown below for sev-

eral different types of transactions. Data is sent most

significant bit (MSB) first.

Table 2. PMBus/SMBus Serial-Port Address

KEY:

S = START

Sr = REPEATED START

P = STOP

W = WRITE BIT (0)

R = READ BIT (1)

A = ACKNOWLEDGE (0)

NA = NOT ACKNOWLEDGE (1)

SHADED BLOCK = SLAVE TRANSACTION

SMBus/PMBus Communication Examples

A1 A0

7-BIT SLAVE

ADDRESS

100kI to V

1101 010 (D4h)

100kI to V

1101 011 (D6h)

100kI to V

1101 100 (D8h)

100kI to V

1101 101 (DAh)

READ WORD FORMAT

1 7 1 1 8 1 1 7 1 1 8 1 8 1 1

SLAVE

ADDRESS

W A

COMMAND

CODE

A Sr

SLAVE

ADDRESS

R A

DATA BYTE

LOW

DATA BYTE

HIGH

NA P

READ BYTE FORMAT

1 7 1 1 8 1 1 7 1 1 8 1 1

SLAVE

ADDRESS

W A

COMMAND

CODE

A Sr

SLAVE

ADDRESS

R A DATA BYTE NA P

WRITE WORD FORMAT

1 7 1 1 8 1 8 1 8 1 1

SLAVE

ADDRESS

W A

COMMAND

CODE

DATA BYTE

LOW

DATA BYTE

HIGH

A P

WRITE BYTE FORMAT

1 7 1 1 8 1 8 1 1

SLAVE

ADDRESS

W A

COMMAND

CODE

A DATA BYTE A P

SEND BYTE FORMAT

1 7 1 1 8 1 1

SLAVE

ADDRESS

W A

COMMAND

CODE

A P

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 42 43

MAX34440 1
43 43

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