SBOS576C May   2012  – September 2025 INA3221

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Basic ADC Functions
      2. 7.3.2 Alert Monitoring
        1. 7.3.2.1 Critical Alert
          1. 7.3.2.1.1 Summation Control Function
        2. 7.3.2.2 Warning Alert
        3. 7.3.2.3 Power-Valid Alert
        4. 7.3.2.4 Timing-Control Alert
        5. 7.3.2.5 Default Settings
      3. 7.3.3 Software Reset
    4. 7.4 Device Functional Modes
      1. 7.4.1 Averaging Function
      2. 7.4.2 Multiple Channel Monitoring
        1. 7.4.2.1 Channel Configuration
        2. 7.4.2.2 Averaging and Conversion-Time Considerations
      3. 7.4.3 Filtering and Input Considerations
    5. 7.5 Programming
      1. 7.5.1 Bus Overview
        1. 7.5.1.1 Serial Bus Address
        2. 7.5.1.2 Serial Interface
      2. 7.5.2 Writing To and Reading From the INA3221
        1. 7.5.2.1 High-Speed I2C Mode
      3. 7.5.3 SMBus Alert Response
    6. 7.6 Register Maps
      1. 7.6.1 Summary of Register Set
      2. 7.6.2 Register Descriptions
        1. 7.6.2.1  Configuration Register (address = 00h) [reset = 7127h]
        2. 7.6.2.2  Channel-1 Shunt-Voltage Register (address = 01h), [reset = 00h]
        3. 7.6.2.3  Channel-1 Bus-Voltage Register (address = 02h) [reset = 00h]
        4. 7.6.2.4  Channel-2 Shunt-Voltage Register (address = 03h) [reset = 00h]
        5. 7.6.2.5  Channel-2 Bus-Voltage Register (address = 04h) [reset = 00h]
        6. 7.6.2.6  Channel-3 Shunt-Voltage Register (address = 05h) [reset = 00h]
        7. 7.6.2.7  Channel-3 Bus-Voltage Register (address = 06h) [reset = 00h]
        8. 7.6.2.8  Channel-1 Critical-Alert Limit Register (address = 07h) [reset = 7FF8h]
        9. 7.6.2.9  Warning-Alert Channel-1 Limit Register (address = 08h) [reset = 7FF8h]
        10. 7.6.2.10 Channel-2 Critical-Alert Limit Register (address = 09h) [reset = 7FF8h]
        11. 7.6.2.11 Channel-2 Warning-Alert Limit Register (address = 0Ah) [reset = 7FF8h]
        12. 7.6.2.12 Channel-3 Critical-Alert Limit Register (address = 0Bh) [reset = 7FF8h]
        13. 7.6.2.13 Channel-3 Warning-Alert Limit Register (address = 0Ch) [reset = 7FF8h]
        14. 7.6.2.14 Shunt-Voltage Sum Register (address = 0Dh) [reset = 00h]
        15. 7.6.2.15 Shunt-Voltage Sum-Limit Register (address = 0Eh) [reset = 7FFEh]
        16. 7.6.2.16 Mask/Enable Register (address = 0Fh) [reset = 0002h]
        17. 7.6.2.17 Power-valid Upper-limit Register (address = 10h) [reset = 2710h]
        18. 7.6.2.18 Power-Valid Lower-Limit Register (address = 11h) [reset = 2328h]
        19. 7.6.2.19 Manufacturer ID Register (address = FEh) [reset = 5449h]
        20. 7.6.2.20 Die ID Register (address = FFh) [reset = 3220]
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.6.1 Summary of Register Set

Table 7-3 Summary of Register Set
POINTER ADDRESS (Hex)REGISTER NAMEDESCRIPTIONPOWER-ON RESETTYPE(1)
BINARYHEX
0ConfigurationAll-register reset, shunt and bus voltage ADC conversion times and averaging, operating mode.01110001 001001117127R/ W
1Channel-1 Shunt VoltageAveraged shunt voltage value.00000000 000000000000R
2Channel-1 Bus VoltageAveraged bus voltage value.00000000 000000000000R
3Channel-2 Shunt VoltageAveraged shunt voltage value.00000000 000000000000R
4Channel-2 Bus VoltageAveraged bus voltage value.00000000 000000000000R
5Channel-3 Shunt VoltageAveraged shunt voltage value.00000000 000000000000R
6Channel-3 Bus VoltageAveraged bus voltage value.00000000 000000000000R
7Channel-1 Critical Alert LimitContains limit value to compare each conversion value to determine if the corresponding limit has been exceeded.01111111 111110007FF8R/ W
8Channel-1 Warning Alert LimitContains limit value to compare to averaged measurement to determine if the corresponding limit has been exceeded.01111111 111110007FF8R/ W
9Channel-2 Critical Alert LimitContains limit value to compare each conversion value to determine if the corresponding limit has been exceeded.01111111 111110007FF8R/ W
AChannel-2 Warning Alert LimitContains limit value to compare to averaged measurement to determine if the corresponding limit has been exceeded.01111111 111110007FF8R/ W
BChannel-3 Critical Alert LimitContains limit value to compare each conversion value to determine if the corresponding limit has been exceeded.01111111 111110007FF8R/ W
CChannel-3 Warning Alert LimitContains limit value to compare to averaged measurement to determine if the corresponding limit has been exceeded.01111111 111110007FF8R/ W
DShunt-Voltage SumContains the summed value of the each of the selected shunt voltage conversions.00000000 000000000000R
EShunt-Voltage Sum LimitContains limit value to compare to the Shunt Voltage Sum register to determine if the corresponding limit has been exceeded.01111111 111111107FFER/ W
FMask/EnableAlert configuration, alert status indication, summation control and status.00000000 000000100002R/ W
10Power-Valid Upper LimitContains limit value to compare all bus voltage conversions to determine if the Power Valid level has been reached.00100111 000100002710R/ W
11Power-Valid Lower LimitContains limit value to compare all bus voltage conversions to determine if the any voltage rail has dropped below the Power Valid range.00100011 001010002328R/ W
FEManufacturer IDContains unique manufacturer identification number.01010100 010010015449R
FFDie IDContains unique die identification number.00110010 001000003220R
(1) Type: R = read-only, R/ W = read/write.