PCA9554PWG4 datasheet(3/34 Pages) TI1

Part #	PCA9554PWG4

Description	SMBus I/O Expander With Interrupt Output

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Manufacturer	TI1 [Texas Instruments]

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DB, DBQ, DGV, DW, OR PW PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

A0

A1

A2

P0

P1

P2

P3

GND

VCC

SDA

SCL

INT

P7

P6

P5

P4

RGV PACKAGE

(TOP VIEW)

16

6

8

2

10

P7

4

3

1

7

5

12

11

9

13

14

15

P6

INT

SCL

A2

P0

P1

P2

RGT PACKAGE

(TOP VIEW)

16

6

8

2

10

P7

4

3

1

7

5

12

11

9

13

14

15

P6

INT

SCL

A2

P0

P1

P2

PCA9554

www.ti.com

SCPS128C – JULY 2006 – REVISED JUNE 2014

4 Description (Continued)

INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the

remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via

the I2C bus. Thus, the PCA9554 can remain a simple slave device.

The device's outputs (latched) have high-current drive capability for directly driving LEDs and low current

consumption.

Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I2C address and allow up to eight

devices to share the same I2C bus or SMBus.

The PCA9554 is pin-to-pin and I2C address compatible with the PCF8574. However, software changes are

required, due to the enhancements in the PCA9554 over the PCF8574.

The PCA9554 and PCA9554A are identical except for their fixed I2C address. This allows for up to 16 of these

devices (eight of each) on the same I2C/SMBus.

5 Pin Configuration and Functions

Pin Functions

QSOP (DBQ)

SOIC (DW),

DESCRIPTION

QFN (RGT) AND

NAME

SSOP (DB),

QFN (RGV)

TSSOP (PW), AND

TVSOP (DGV)

A0

1

15

Address input. Connect directly to VCC or ground.

A1

2

16

Address input. Connect directly to VCC or ground.

A2

3

1

Address input. Connect directly to VCC or ground.

P0

4

2

P-port input/output. Push-pull design structure.

P1

5

3

P-port input/output. Push-pull design structure.

P2

6

4

P-port input/output. Push-pull design structure.

P3

7

5

P-port input/output. Push-pull design structure.

GND

8

6

Ground

P4

9

7

P-port input/output. Push-pull design structure.

P5

10

8

P-port input/output. Push-pull design structure.

P6

11

9

P-port input/output. Push-pull design structure.

P7

12

10

P-port input/output. Push-pull design structure.

INT

13

11

Interrupt output. Connect to VCC through a pullup resistor.

SCL

14

12

Serial clock bus. Connect to VCC through a pullup resistor.

SDA

15

13

Serial data bus. Connect to VCC through a pullup resistor.

VCC

16

14

Supply voltage

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