2003 Jan 27

14

Philips Semiconductors

Product specification

8-bit A/D and D/A converter

PCF8591

8.5

After a start condition a valid hardware address has to be sent to a PCF8591 device. The read/write bit defines the

direction of the following single or multiple byte data transfer. For the format and the timing of the start condition (S), the

terminated by sending either a stop condition or the start condition of the next data transfer.

handbook, full pagewidth

0

MBL833

S

ADDRESS

CONTROL BYTE

DATA BYTE

acknowledge

from PCF8591

A

acknowledge

from PCF8591

A

A

P/S

acknowledge

from PCF8591

N = 0 to M

data bytes

Fig.16 Bus protocol for write mode, D/A conversion.

handbook, full pagewidth

1

MBL834

S

ADDRESS

DATA BYTE

LAST DATA BYTE

acknowledge

from PCF8591

A

acknowledge

from master

A

1

P

no acknowledge

N = 0 to M

data bytes

Fig.17 Bus protocol for read mode, A/D conversion.