PCA9556(1998) Просмотр технического описания (PDF) - Philips Electronics

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производитель

PCA9556
(Rev.:1998)

Octal SMBus Registered Interface

Philips Electronics 

Philips Semiconductors

Octal SMBus Registered Interface

Product specification

PCA9556

SMBus Address

slave address

0 0 1 1 A2 A1 A0 R/W

fixed

programmable

su01048

Figure 5. PCA9556 address

SMBus Transactions

Data is transmitted to the PCA9556 registers using Write Byte transfers (see Figures 6 and 7). Data is read from the PCA9556 registers using

Read and Receive Byte transfers (see FIgures 8 and 9).

1 2345 6 78 9

SCL

slave address

command byte

data to port

SDA S 0 0 1 1 A2 A1 A0 0 A 0 0 0 0 0 0 0 1 A

start condition

WRITE TO

PORT

R/W acknowledge

from slave

acknowledge

from slave

DATA 1

DATA OUT

FROM PORT

Figure 6. WRITE to output port register via Write Byte Protocol

A

acknowledge

from slave

DATA 1 VALID

tpv

su01049

1 2345 6 78 9

SCL

slave address

command byte

data to register

SDA S 0 0 1 1 A2 A1 A0 0 A 0 0 0 0 0 0 1 1/0 A

start condition

R/W acknowledge

from slave

acknowledge

from slave

DATA

A

acknowledge

from slave

Figure 7. WRITE to I/O configuration or polarity inversion registers via Write Byte Protocol

su01050

1998 Dec 18

6

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