PCA9698

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© NXP B.V. 2010. All rights reserved.

Product data sheet

Rev. 3 — 3 August 2010

27 of 48

NXP Semiconductors

PCA9698

OE is LOW (with OEPOL = 0) or HIGH (with OEPOL = 1) to observe a change in the outputs.

OCH = 0. When OCH = 1, the change in the port happens at the acknowledge phase.

Two, three, or four adjacent banks can be programmed by using the Auto-Increment feature (AI = 1) and change at the

corresponding output port becomes effective at the STOP command when OCH = 0, or at each acknowledge when OCH = 1.

Fig 16. Write to a specific output port

002aab945

S A6 A5 A4 A3 A2 A1 A0 0 A

slave address

R/W

START condition

A

acknowledge

from slave

DATA BANK X

P

STOP

condition

A

SDA

write to port

data out from port

data X valid

AI

0001 D2 D1 D0

acknowledge

from slave

acknowledge

from slave

bank X

determined by

D2, D1, D0

The programing becomes effective at the Acknowledge.

Less than 5 bytes can be programmed by using the same scheme. ‘D5 D4 D3 D2 D1 D0’ refers to the first register to be

programmed.

If more than 5 bytes are written, previous data are overwritten (the sixth configuration register will roll over to the first addressed

configuration register, the sixth Polarity Inversion register will roll over to the first addressed Polarity Inversion register, the sixth

Mask interrupt register will roll over to the first addressed Mask interrupt register.

Fig 17. Write to the I/O Configuration, Polarity Inversion, or Mask interrupt registers (5 banks)

002aab946

S A6 A5 A4 A3 A2 A1 A0 0 A

slave address

R/W

START condition

command register

AI = 1

A

acknowledge

from slave

DATA BANK 0 A

acknowledge

from slave

DATA BANK 1

acknowledge

from slave

A

acknowledge

from slave

DATA BANK 2 A

acknowledge

from slave

DATA BANK 3 A

acknowledge

from slave

DATA BANK 4

P

STOP

condition

A

SDA

1

0 D5 D4 D3 D2 D1 D0

01 0000 for Polarity Inversion register programming bank 0

01 1000 for Configuration register programming bank 0

10 0000 for Mask interrupt register programming bank 0

acknowledge

from slave