PCA9554B datasheet(9/36 Pages) NXP

Part #	PCA9554B

Description	Low-voltage 8-bit I2C-bus and SMBus low power I/O port with interrupt, weak pull-up

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Manufacturer	NXP [NXP Semiconductors]

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PCA9554B_PCA9554C

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Product data sheet

Rev. 1 — 19 September 2012

9 of 36

NXP Semiconductors

PCA9554B; PCA9554C

Low-voltage 8-bit I2C-bus/SMBus low power I/O port

7.

Bus transactions

The PCA9554B/PCA9554C is an I2C-bus slave device. Data is exchanged between the

master and PCA9554B/PCA9554C through write and read commands using I2C-bus. The

two communication lines are a serial data line (SDA) and a serial clock line (SCL). Both

lines must be connected to a positive supply via a pull-up resistor when connected to the

output stages of a device. Data transfer may be initiated only when the bus is not busy.

7.1 Write commands

Data is transmitted to the PCA9554B/PCA9554C by sending the device address and

setting the Least Significant Bit (LSB) to a logic 0 (see Figure 4 for device address). The

command byte is sent after the address and determines which register receives the data

that follows the command byte. There is no limitation on the number of data bytes sent in

one write transmission.

(1) PCA9554B address shown. Address for PCA9554C is 0111,A2,A1,A0.

Fig 7.

Write to Output port register

0

A

S

slave address(1)

START condition

R/W

acknowledge

from slave

002aah124

0000001

0

command byte

A

acknowledge

from slave

12345678

SCL

9

SDA

DATA 1

A

write to port

data out from port

tv(Q)

acknowledge

from slave

DATA 1 VALID

data to port

1

0

A2 A1 A0

0

P

STOP

condition

(1) PCA9554B address shown. Address for PCA9554C is 0111,A2,A1,A0.

Fig 8.

Write to Configuration or Polarity inversion registers

0

A

S

slave address(1)

START condition

R/W

acknowledge

from slave

002aah125

0

0 1/0 1/0

0

command byte

A

acknowledge

from slave

12345678

SCL

9

SDA

DATA 1

A

acknowledge

from slave

data to register

1

0

A2 A1 A0

0

P

STOP

condition

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PCA9554B Datasheet(PDF) 9 Page - NXP Semiconductors

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