Philips Semiconductors

Objective data sheet

PCA9536

2004 Aug 20

6

Device address

10

0

0

0

0

1

SLAVE ADDRESS

FIXED

R/W

SW02193

Figure 4. PCA9536 address

Bus transactions

Data is transmitted to the PCA9536 registers using the write mode as shown in Figures 5 and 6. Data is read from the PCA9536 registers using

the read mode as shown in Figures 7 and 8. These devices do not implement an auto-increment function so once a command byte has been

sent, the register which was addressed will continue to be accessed by reads until a new command byte has been sent.

12

SCL

WRITE TO

PORT

DATA OUT

FROM PORT

3

4

567

8

SDA

S0

A

A

A

10

0

0

00

1

DATA 1

slave address

data to port

start condition

R/W

acknowledge

from slave

acknowledge

from slave

acknowledge

from slave

DATA 1 VALID

SW02194

9

1

00

0

0

00

0

command byte

P

Figure 5. WRITE to output port register

12

SCL

3

4

567

8

SDA

S0

A

A

A

DATA

slave address

data to register

start condition

R/W

acknowledge

from slave

acknowledge

from slave

acknowledge

from slave

SW02195

9

00

0

0

00

1

command byte

1/0

DATA TO

REGISTER

P

10

0

0

00

1

Figure 6. WRITE to configuration or polarity inversion registers