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

slave address

acknowledge

from slave

S 0 0 1 1 A2 A1 A0 0 A

R/W

acknowledge

from slave

slave address

acknowledge

from slave

acknowledge

data from register from master

COMMAND BYTE

A S 0 0 1 1 A2 A1 A0 1 A

R/W

at this moment master-transmitter

becomes master-receiver and

slave-receiver becomes

slave-transmitter

DATA

A

first byte

data from register

no acknowledge

from master

DATA

last byte

NA P

Figure 8. READ from register via Read byte protocol

su01052

SDA

READ FROM

PORT

DATA INTO

PORT

slave address

data from port

S 0 0 1 1 A2 A1 A0 1 A

start condition

R/W acknowledge

from slave

DATA 1

data from port

A

acknowledge

from master

DATA 4

NA P

no acknowledge

from master

stop

condition

DATA 2

DATA 3

DATA 4

tph

tps

Notes:

1. This figure assumes the command byte has previously been programmed with 00h.

2. Transfer of data can be stopped at any moment by a stop condition. When this occurs,

data present at the last acknowledge phase is valid (output mode). Input data is lost.

Figure 9. READ input port register via Receive byte protocol

su01051

1998 Dec 18

7

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