PCA9531PW Ver la hoja de datos (PDF) - Philips Electronics

Número de pieza

componentes Descripción

Fabricante

PCA9531PW

8-bit I2C LED dimmer

Philips Electronics 

Philips Semiconductors

8-bit I2C LED dimmer

Product data

PCA9531

Bus transactions

1 2345 6 78 9

SCL

slave address

command byte

data to register

SDA S 1 1 0 0 A2 A1 A0 0 A 0 0 0 AI 0 B2 B1 B0 A

start condition

R/W acknowledge

from slave

acknowledge

from slave

WRITE TO

REGISTER

DATA 1

DATA OUT

FROM PORT

Figure 10. WRITE to register

A

acknowledge

from slave

DATA 1 VALID

tpv

SW01081

slave address

acknowledge

from slave

acknowledge

from slave

slave address

acknowledge

from slave

acknowledge

data from register from master

S 1 1 0 0 A2 A1 A0 0 A 0 0 0 AI 0 B2 B1 B0 A S 1 1 0 0 A2 A1 A0 1 A

R/W

R/W

at this moment master-transmitter

becomes master-receiver and

slave-receiver becomes

slave-transmitter

DATA

A

first byte

auto-increment

register address

if AI = 1

data from register

no acknowledge

from master

DATA

last byte

NA P

Figure 11. READ from register

SW01082

SDA

READ FROM

PORT

slave address

data from port

S 1 1 0 0 A2 A1 A0 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 INTO

PORT

DATA 1

DATA 2

DATA 3

tph

tps

NOTES:

1. This figure assumes the command byte has previously been programmed with 00h.

Figure 12. READ input port register

DATA 4

SW01084

2003 Nov 10

8

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