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INA3221

SBOS576B – MAY 2012 – REVISED MARCH 2016

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Copyright © 2012–2016, Texas Instruments Incorporated

Table of Contents

1

Features .................................................................. 1

2

Applications ........................................................... 1

3

Description ............................................................. 1

4

Revision History..................................................... 2

5

Device Comparison Table..................................... 4

6

Pin Configuration and Functions ......................... 4

7

Specifications......................................................... 5

7.1

Absolute Maximum Ratings ...................................... 5

7.2

ESD Ratings.............................................................. 5

7.3

Recommended Operating Conditions ....................... 5

7.4

Thermal Information .................................................. 5

7.5

Electrical Characteristics........................................... 6

7.6

Typical Characteristics .............................................. 7

8

Detailed Description ............................................ 10

8.1

Overview ................................................................. 10

8.2

Functional Block Diagram ....................................... 10

8.3

Feature Description................................................. 11

8.4

Device Functional Modes........................................ 16

8.5

Programming .......................................................... 20

8.6

Register Maps ......................................................... 24

9

Application and Implementation ........................ 36

9.1

Application Information............................................ 36

9.2

Typical Application ................................................. 36

10

Power Supply Recommendations ..................... 38

11

Layout................................................................... 38

11.1

Layout Guidelines ................................................. 38

11.2

Layout Example .................................................... 38

12

Device and Documentation Support ................. 39

12.1

Device Support...................................................... 39

12.2

Documentation Support ....................................... 39

12.3

Community Resources.......................................... 39

12.4

Trademarks ........................................................... 39

12.5

Electrostatic Discharge Caution ............................ 39

12.6

Glossary ................................................................ 39

13

Mechanical, Packaging, and Orderable

Information ........................................................... 39

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision A (June 2013) to Revision B

Page

•

Added Device Informationand ESD Ratings tables, and Feature Description, Device Functional Modes, Application

and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and

Mechanical, Packaging, and Orderable Information sections ................................................................................................ 1

•

•

•

Deleted VBUS from analog inputs in Absolute Maximum Ratings table ............................................................................... 5

•

Added operating temperature to Absolute Maximum Ratings table ....................................................................................... 5

•

•

Changed "Status register" to "Mask/Enable register" to clarify register name in Basic ADC Functions section ................. 11

•

Changed Critical Alert section text for clarity. ...................................................................................................................... 12

•

Added Summation Control Function section ........................................................................................................................ 12

•

•

Changed Multiple Channel Monitoring section text for clarity. ............................................................................................ 17

•

Added X and Y axis labels to Figure 25 ............................................................................................................................... 18

•

Changed "bidirectional" to "I/O" in second paragraph of Bus Overview section .................................................................. 20

•

•

Changed references in Figure 30 to point to correct notes .................................................................................................. 22

•

Changed Figure 31 ............................................................................................................................................................... 23

•

Changed values in Table 2, Bus Timing Definitions............................................................................................................. 23

•

Added data valid time to Table 2, Bus Timing Definitions.................................................................................................... 23

•

Changed fall time to split data and clock times in Table 2, Bus Timing Definitions ............................................................. 23

•

Deleted rise time for data in Table 2, Bus Timing Definitions .............................................................................................. 23

•