PCA9541 datasheet(16/30 Pages) PHILIPS

16 / 30 page

SLAVE ADDRESS

start condition

R/W

SW02306

COMMAND CODE REGISTER

DATA MASK REGISTER

DATA CONTROL REGISTER

Stop condition

acknowledge

from slave

acknowledge

from slave

acknowledge

from slave

Auto

increment

acknowledge

from slave

Figure 12. Write to the Mask and Control Registers using the Auto-Increment (AI) bit

NOTE: If a 3rd data byte is sent, it will not be acknowledged by the PCA9541.

A3 A2

SLAVE ADDRESS

start condition

R/W

acknowledge

from slave

acknowledge

from slave

COMMAND CODE

ACCESS TO REGISTER

XX = 00, 01, OR 10

SW02307

stop

condition

acknowledge

from slave

no acknowledge-

from master

1A3 A2

1A3 A2 A1

R/W

SLAVE ADDRESS

re-start

condition

Auto

Increment

acknowledge

from master

acknowledge

from master

XX = 00 : INTERRUPT ENABLE REGISTER

CONTROL REGISTER

INT REGISTER

XX = 01 : CONTROL REGISTER

INT REGISTER

INTERRUPT ENABLE REGISTER

XX = 10 : INT REGISTER

INTERRUPT ENABLE REGISTER

CONTROL REGISTER

Figure 13. Read the 3 registers using the Auto-Increment (AI) bit

NOTE: If a 4th data byte is read, the first Register will be accessed.

PCA9541 Datasheet(PDF) 16 Page - NXP Semiconductors

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