PCA9698BS,118

PCA9698

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2010. All rights reserved.

Product data sheet

Rev. 3 — 3 August 2010 

24 of 48

NXP Semiconductors

PCA9698

40-bit Fm+ I

2

C-bus advanced I/O port with RESET, OE and INT

8.2 System configuration

A device generating a message is a ‘transmitter’; a device receiving is the ‘receiver’. The 
device that controls the message is the ‘master’ and the devices which are controlled by 
the master are the ‘slaves’ (see 

Figure 13

).

 

8.3 Acknowledge

The number of data bytes transferred between the START and the STOP conditions from 
transmitter to receiver is not limited. Each byte of eight bits is followed by one 
acknowledge bit. The acknowledge bit is a HIGH level put on the bus by the transmitter, 
whereas the master generates an extra acknowledge related clock pulse.

A slave receiver which is addressed must generate an acknowledge after the reception of 
each byte. Also a master must generate an acknowledge after the reception of each byte 
that has been clocked out of the slave transmitter. The device that acknowledges has to 
pull down the SDA line during the acknowledge clock pulse, so that the SDA line is stable 
LOW during the HIGH period of the acknowledge related clock pulse; set-up and hold 
times must be taken into account.

A master receiver must signal an end of data to the transmitter by not generating an 
acknowledge on the last byte that has been clocked out of the slave. In this event, the 
transmitter must leave the data line HIGH to enable the master to generate a STOP 
condition.

 

Fig 13. System configuration

002aaa966

MASTER

TRANSMITTER/

RECEIVER

SLAVE

RECEIVER

SLAVE

TRANSMITTER/

RECEIVER

MASTER

TRANSMITTER

MASTER

TRANSMITTER/

RECEIVER

SDA

SCL

I

2

C-BUS

MULTIPLEXER

SLAVE

Fig 14. Acknowledgement on the I

2

C-bus

002aaa987

S

START

condition

9

8

2

1

clock pulse for

acknowledgement

not acknowledge

acknowledge

data output

by transmitter

data output

by receiver

SCL from master

PCA9698BS,118 Information:
Part No.
PCA9698BS,118

RFQ

Description
IC I/O EXPANDER I2C 40B 56HVQFN
File Size
370946 bytes
Page Size
595.22 x 842 pts (A4)
All Pages
48
Manufacturer
NXP Semiconductors
Homepage
http://www.nxp.com/
Logo
PCA9698BS,118 Datasheet Related Products: