NXP Semiconductors
PCA9675
Remote 16-bit I/O expander for Fm+ I
2
C-bus with interrupt
© NXP B.V. 2011. All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 3 October 2011
Document identifier: PCA9675
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
21. Contents
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features and benefits . . . . . . . . . . . . . . . . . . . . 1
3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4 Ordering information. . . . . . . . . . . . . . . . . . . . . 2
5 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
6 Pinning information. . . . . . . . . . . . . . . . . . . . . . 4
6.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
7 Functional description . . . . . . . . . . . . . . . . . . . 6
7.1 Device address. . . . . . . . . . . . . . . . . . . . . . . . . 6
7.1.1 Address maps. . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.2 Software Reset call, and Device ID
addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.2.1 Software Reset . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.2.2 Device ID (PCA9675 ID field). . . . . . . . . . . . . 10
8 I/O programming . . . . . . . . . . . . . . . . . . . . . . . 12
8.1 Quasi-bidirectional I/O architecture . . . . . . . . 12
8.2 Writing to the port (Output mode) . . . . . . . . . . 12
8.3 Reading from a port (Input mode) . . . . . . . . . 13
8.4 Power-on reset . . . . . . . . . . . . . . . . . . . . . . . . 16
8.5 Interrupt output (INT
) . . . . . . . . . . . . . . . . . . . 16
9 Characteristics of the I
2
C-bus . . . . . . . . . . . . 17
9.1 Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9.1.1 START and STOP conditions . . . . . . . . . . . . . 17
9.2 System configuration . . . . . . . . . . . . . . . . . . . 17
9.3 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . 18
10 Application design-in information . . . . . . . . . 19
10.1 Bidirectional I/O expander applications . . . . . 19
10.2 High current-drive load applications . . . . . . . . 19
10.3 Differences between the PCA9675 and the
PCF8575 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
11 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 20
12 Static characteristics. . . . . . . . . . . . . . . . . . . . 21
13 Dynamic characteristics . . . . . . . . . . . . . . . . . 22
14 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 24
15 Handling information. . . . . . . . . . . . . . . . . . . . 28
16 Soldering of SMD packages . . . . . . . . . . . . . . 28
16.1 Introduction to soldering . . . . . . . . . . . . . . . . . 28
16.2 Wave and reflow soldering . . . . . . . . . . . . . . . 28
16.3 Wave soldering. . . . . . . . . . . . . . . . . . . . . . . . 28
16.4 Reflow soldering. . . . . . . . . . . . . . . . . . . . . . . 29
17 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 30
18 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 31
19 Legal information. . . . . . . . . . . . . . . . . . . . . . . 32
19.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 32
19.2 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
19.3 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 32
19.4 Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 33
20 Contact information . . . . . . . . . . . . . . . . . . . . 33
21 Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
