PCA9512BD Просмотр технического описания (PDF) - NXP Semiconductors.
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PCA9512BD Datasheet PDF : 27 Pages
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NXP Semiconductors
PCA9512A; PCA9512B
Level shifting hot swappable I2C-bus and SMBus bus buffer
20. Contents
1
General description . . . . . . . . . . . . . . . . . . . . . . 1 18.2
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2
Features and benefits . . . . . . . . . . . . . . . . . . . . 1 18.3
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 18.4
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4
Feature selection . . . . . . . . . . . . . . . . . . . . . . . . 2 19
Contact information . . . . . . . . . . . . . . . . . . . . 26
5
Ordering information . . . . . . . . . . . . . . . . . . . . . 3 20
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.1
Ordering options . . . . . . . . . . . . . . . . . . . . . . . . 3
6
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 4
7
Pinning information . . . . . . . . . . . . . . . . . . . . . . 5
7.1
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
8
Functional description . . . . . . . . . . . . . . . . . . . 5
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
8.9.1
8.9.2
8.10
8.10.1
8.10.2
8.11
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Connect circuitry . . . . . . . . . . . . . . . . . . . . . . . . 6
Maximum number of devices in series . . . . . . . 6
Propagation delays . . . . . . . . . . . . . . . . . . . . . . 8
Rise time accelerators . . . . . . . . . . . . . . . . . . . 8
ACC boost current enable . . . . . . . . . . . . . . . . 8
Resistor pull-up value selection . . . . . . . . . . . . 8
Hot swapping and capacitance buffering
application . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Voltage level translator discussion . . . . . . . . . 12
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Why do level translation? . . . . . . . . . . . . . . . . 12
Limitations of the FET voltage
level translator . . . . . . . . . . . . . . . . . . . . . . . . 12
VGSth, gate-source threshold voltage . . . . . . . 12
FET body diode voltage . . . . . . . . . . . . . . . . . 12
Additional system compromises . . . . . . . . . . . 13
9
Application design-in information . . . . . . . . . 13
10
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 14
11
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 14
11.1
Typical performance characteristics . . . . . . . . 16
12
Test information . . . . . . . . . . . . . . . . . . . . . . . . 17
13
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 18
14
Soldering of SMD packages . . . . . . . . . . . . . . 20
14.1
Introduction to soldering . . . . . . . . . . . . . . . . . 20
14.2
Wave and reflow soldering . . . . . . . . . . . . . . . 20
14.3
Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 20
14.4
Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . 21
15
Soldering: PCB footprints. . . . . . . . . . . . . . . . 22
16
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 24
17
Revision history . . . . . . . . . . . . . . . . . . . . . . . . 24
18
Legal information. . . . . . . . . . . . . . . . . . . . . . . 25
18.1
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 25
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: 1 March 2013
Document identifier: PCA9512A_PCA9512B
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