9532 Ver la hoja de datos (PDF) - Philips Electronics

Número de pieza

componentes Descripción

Fabricante

9532

16-bit I²C LED dimmer

Philips Electronics 

Philips Semiconductors

16-bit I2C LED dimmer

Product data

PCA9532

SDA

SCL

MASTER

TRANSMITTER/

RECEIVER

SLAVE

RECEIVER

SLAVE

TRANSMITTER/

RECEIVER

MASTER

TRANSMITTER

MASTER

TRANSMITTER/

RECEIVER

I2C

MULTIPLEXER

SLAVE

SW00366

Figure 8. System configuration

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.

DATA OUTPUT

BY TRANSMITTER

DATA OUTPUT

BY RECEIVER

SCL FROM

MASTER

S

not acknowledge

acknowledge

1

2

8

9

START condition

Figure 9. Acknowledgement on the I2C-bus

clock pulse for

acknowledgement

SW00368

2003 May 02

8

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