8574A Просмотр технического описания (PDF) - NXP Semiconductors.
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8574A Datasheet PDF : 33 Pages
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NXP Semiconductors
PCF8574; PCF8574A
Remote 8-bit I/O expander for I2C-bus with interrupt
24. Contents
1
General description . . . . . . . . . . . . . . . . . . . . . . 1 18.3
Manual soldering . . . . . . . . . . . . . . . . . . . . . . 24
2
Features and benefits . . . . . . . . . . . . . . . . . . . . 1 18.4
Package related soldering information. . . . . . 25
3
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 19
Soldering: PCB footprints . . . . . . . . . . . . . . . 26
4
Ordering information . . . . . . . . . . . . . . . . . . . . . 2 20
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.1
Ordering options . . . . . . . . . . . . . . . . . . . . . . . . 2 21
Revision history . . . . . . . . . . . . . . . . . . . . . . . 29
5
6
6.1
6.2
7
7.1
7.1.1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pinning information . . . . . . . . . . . . . . . . . . . . . . 4
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4
Functional description . . . . . . . . . . . . . . . . . . . 5
Device address . . . . . . . . . . . . . . . . . . . . . . . . . 5
Address maps. . . . . . . . . . . . . . . . . . . . . . . . . . 5
22
Legal information . . . . . . . . . . . . . . . . . . . . . . 31
22.1
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 31
22.2
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
22.3
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 31
22.4
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 32
23
Contact information . . . . . . . . . . . . . . . . . . . . 32
24
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8
I/O programming . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1
Quasi-bidirectional I/Os . . . . . . . . . . . . . . . . . . 6
8.2
Writing to the port (Output mode) . . . . . . . . . . . 8
8.3
Reading from a port (Input mode) . . . . . . . . . . 9
8.4
Power-on reset . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.5
Interrupt output (INT) . . . . . . . . . . . . . . . . . . . 10
9
Characteristics of the I2C-bus . . . . . . . . . . . . 11
9.1
9.1.1
9.2
9.3
Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
START and STOP conditions . . . . . . . . . . . . . 11
System configuration . . . . . . . . . . . . . . . . . . . 11
Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . 12
10
Application design-in information . . . . . . . . . 13
10.1
Bidirectional I/O expander applications . . . . . 13
10.2
How to read and write to I/O expander
(example) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
10.3
High current-drive load applications . . . . . . . . 14
10.4
Migration path . . . . . . . . . . . . . . . . . . . . . . . . . 14
11
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 15
12
Thermal characteristics . . . . . . . . . . . . . . . . . 15
13
Static characteristics. . . . . . . . . . . . . . . . . . . . 16
14
Dynamic characteristics . . . . . . . . . . . . . . . . . 17
15
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 19
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
Soldering of through-hole mount packages . 24
18.1
Introduction to soldering through-hole mount
packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
18.2
Soldering by dipping or by solder wave . . . . . 24
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2013.
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: 27 May 2013
Document identifier: PCF8574_PCF8574A
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