PCA9537 查看數據表（PDF） - Philips Electronics

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PCA9537

4-bit I2C and SMBus low power I/O port with interrupt and reset

Philips Electronics 

Philips Semiconductors

4-bit I2C and SMBus low power I/O port

with interrupt and reset

Product data sheet

PCA9537

slave address

acknowledge

from slave

S 1 0 0 10 0 1 0 A

R/W

acknowledge

from slave

slave address

acknowledge

from slave

acknowledge

data from register from master

COMMAND BYTE

A S 1 0 0 10 0 1 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

Figure 7. READ from register

DATA

last byte

NA P

SW02187

SCL

SDA

READ FROM

PORT

DATA INTO

PORT

1 2345 6 78 9

slave address

data from port

S1 0 0 10 0 1 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

tph

DATA 3

tps

DATA 4

INT

tiv

tir

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.

Expanded diagram found on page 13, Figure 15.

Figure 8. READ input port register

SW02188

2004 Nov 29

7

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