NXP Semiconductors

PCA9574

8-bit I2C-bus and SMBus, level translating, low voltage GPIO with reset and interrupt

Contents

1

General description ............................................ 1

2

Features and benefits .........................................1

3

Applications .........................................................2

4

Ordering information .......................................... 2

4.1

Ordering options ................................................ 3

5

Block diagram ..................................................... 3

6

Pinning information ............................................ 5

6.1

Pinning ...............................................................5

6.2

Pin description ................................................... 5

7

Functional description ........................................6

7.1

Device address ..................................................6

7.2

Command register ............................................. 6

7.3

Register definitions ............................................ 6

7.4

Writing to port registers ..................................... 7

7.5

Reading the port registers ................................. 7

7.5.1

Register 0 - Input port register .......................... 7

7.5.2

Register 1 - Polarity inversion register ...............8

7.5.3

Register 2 - Bus-hold/pull-up/pull-down

enable register ...................................................8

7.5.4

Register 3 - Pull-up/pull-down selector

register ...............................................................9

7.5.5

Register 4 - Configuration register .....................9

7.5.6

Register 5 - Output port register ........................9

7.5.7

Register 6 - Interrupt mask register ................. 10

7.5.8

Register 7 - Interrupt status register ................ 10

7.6

Power-on reset ................................................ 11

7.7

RESET input ....................................................11

7.8

Software reset ................................................. 11

7.9

Interrupt output (INT) .......................................11

7.10

Standby ............................................................12

8

Characteristics of the I2C-bus ......................... 12

8.1

Bit transfer ....................................................... 12

8.1.1

START and STOP conditions .......................... 12

8.2

System configuration ....................................... 12

8.3

Acknowledge ....................................................13

9

Bus transactions ...............................................13

10

Application design-in information ...................15

11

Limiting values ..................................................16

12

Static characteristics ........................................16

13

Dynamic characteristics ...................................17

14

Test information ................................................ 19

15

Package outline .................................................20

16

Handling information ........................................ 22

17

Soldering of SMD packages .............................22

17.1

Introduction to soldering .................................. 22

17.2

Wave and reflow soldering .............................. 22

17.3

Wave soldering ................................................22

17.4

Reflow soldering .............................................. 23

18

Abbreviations .................................................... 24

19

Revision history ................................................ 25

20

Legal information ..............................................26

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Date of release: 31 May 2023

Document identifier: PCA9574