PCA9532 datasheet(12/29 Pages) NXP

12 / 29 page

PCA9532_4

Product data sheet

Rev. 04 — 17 March 2009

12 of 29

NXP Semiconductors

PCA9532

16-bit I2C-bus LED dimmer

7.4 Bus transactions

Fig 11. Write to register

slave address

START condition

R/W

acknowledge

from slave

002aae526

AI B3 B2 B1 B0

command byte

acknowledge

from slave

12345678

SCL

SDA

DATA 1

write to register

data out from port

tv(Q)

acknowledge

from slave

DATA 1 VALID

data to register

A2 A1 A0

Fig 12. Read from register

A2 A1 A0

START condition

R/W

acknowledge

from slave

002aae527

acknowledge

from slave

SDA

acknowledge

from master

data from register

DATA (first byte)

slave address

STOP

condition

(repeated)

START condition

(cont.)

R/W

acknowledge

from slave

slave address

at this moment master-transmitter becomes master-receiver

and slave-receiver becomes slave-transmitter

no acknowledge

from master

data from register

DATA (last byte)

command byte

AI B3 B2 B1

0B0

Auto-Increment

if AI = 1

A2 A1 A0

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

Fig 13. Read input port register

A2 A1 A0

START condition

R/W

acknowledge

from slave

002aae528

acknowledge

from master

SDA

read from

port

data into

port

th(D)

data from port

no acknowledge

from master

data from port

DATA 4

slave address

DATA 1

STOP

condition

DATA 2

DATA 3

DATA 4

tsu(D)

DATA 1

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