1

FEATURES

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

RESET

P0

P1

P2

P3

GND

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

RESET

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

RESET

P0

P1

P2

DESCRIPTION/ORDERING INFORMATION

PCA9538

WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

• Low Standby Current Consumption of

• Power-Up With All Channels Configured as

1

µA Max

Inputs

• No Glitch on Power Up

• Open-Drain Active-Low Interrupt Output

• Noise Filter on SCL/SDA Inputs

• Active-Low Reset Input

• Latched Outputs With High-Current Drive

Maximum Capability for Directly Driving LEDs

• Operating Power-Supply Voltage Range of

2.3 V to 5.5 V

• Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

• 5-V Tolerant I/O Ports

• ESD Protection Exceeds JESD 22

–

2000-V Human-Body Model (A114-A)

• Two Hardware Address Pins Allow up to Four

–

200-V Machine Model (A115-A)

• Input/Output Configuration Register

–

1000-V Charged-Device Model (C101)

• Polarity Inversion Register

(SCL), serial data (SDA)].

The PCA9538 consists of one 8-bit Configuration (input or output selection), Input Port, Output Port, and Polarity

Inversion (active high or active low) registers. At power on, the I/Os are configured as inputs. However, the

system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for

each input or output is kept in the corresponding Input Port or Output Port register. The polarity of the Input Port

register can be inverted with the Polarity Inversion register. All registers can be read by the system master.

The system master can reset the PCA9538 in the event of a timeout or other improper operation by asserting a

state machine. The RESET pin causes the same reset/initialization to occur without powering down the part.

The PCA9538 open-drain interrupt (INT) output is activated when any input state differs from its corresponding

Input Port register state and is used to indicate to the system master that an input state has changed.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

UNLESS

OTHERWISE

NOTED

this

document

contains

Copyright © 2006–2008, Texas Instruments Incorporated

PRODUCTION DATA information current as of publication date.

Products conform to specifications per the terms of Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.