SBOS547B June   2011  – September 2024 INA226

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Basic ADC Functions
        1. 6.3.1.1 Power Calculation
        2. 6.3.1.2 Alert Pin
    4. 6.4 Device Functional Modes
      1. 6.4.1 Averaging and Conversion Time Considerations
      2. 6.4.2 Filtering and Input Considerations
    5. 6.5 Programming
      1. 6.5.1 Programming the Calibration Register
      2. 6.5.2 Programming the Power Measurement Engine
        1. 6.5.2.1 Calibration Register and Scaling
      3. 6.5.3 Simple Current Shunt Monitor Usage (No Programming Necessary)
      4. 6.5.4 Default Settings
      5. 6.5.5 Bus Overview
        1. 6.5.5.1 Serial Bus Address
        2. 6.5.5.2 Serial Interface
        3. 6.5.5.3 Writing to and Reading From the INA226
          1. 6.5.5.3.1 High-Speed I2C Mode
        4. 6.5.5.4 SMBus Alert Response
  8. 7 Registers
    1. 7.1 Register Maps
      1. 7.1.1  Configuration Register (00h) (Read/Write)
      2. 7.1.2  Shunt Voltage Register (01h) (Read-Only)
      3. 7.1.3  Bus Voltage Register (02h) (Read-Only) #GUID-792F23A7-1E45-4FB9-9334-0BF769622DE4/SBOS5477597
      4. 7.1.4  Power Register (03h) (Read-Only)
      5. 7.1.5  Current Register (04h) (Read-Only)
      6. 7.1.6  Calibration Register (05h) (Read/Write)
      7. 7.1.7  Mask/Enable Register (06h) (Read/Write)
      8. 7.1.8  Alert Limit Register (07h) (Read/Write)
      9. 7.1.9  Manufacturer ID Register (FEh) (Read-Only)
      10. 7.1.10 Die ID Register (FFh) (Read-Only)
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 High-Side Sensing Circuit Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 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 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.1 Register Maps

The INA226 uses a bank of registers for holding configuration settings, measurement results, minimum/maximum limits, and status information. Table 7-1 summarizes the device registers; refer to the Functional Block Diagram section for an illustration of the registers.

All 16-bit device registers are two 8-bit bytes via the I2C interface.

Table 7-1 Register Set Summary
POINTER ADDRESSREGISTER NAMEFUNCTIONPOWER-ON RESETTYPE(1)
HEXBINARYHEX
00hConfiguration RegisterAll-register reset, shunt voltage and bus voltage ADC conversion times and averaging, operating mode.01000001 001001114127R/ W
01hShunt Voltage RegisterShunt voltage measurement data.00000000 000000000000R
02hBus Voltage RegisterBus voltage measurement data.00000000 000000000000R
03hPower Register(2)Contains the value of the calculated power being delivered to the load.00000000 000000000000R
04hCurrent Register(2)Contains the value of the calculated current flowing through the shunt resistor.00000000 000000000000R
05hCalibration RegisterSets full-scale range and LSB of current and power measurements. Overall system calibration.00000000 000000000000R/ W
06hMask/Enable RegisterAlert configuration and Conversion Ready flag.00000000 000000000000R/ W
07hAlert Limit RegisterContains the limit value to compare to the selected Alert function.00000000 000000000000R/ W
FEhManufacturer ID RegisterContains unique manufacturer identification number.01010100010010015449R
FFhDie ID RegisterContains unique die identification number.00100010011000002260R
(1) Type: R = Read-Only, R/ W = Read/Write.
(2) The Current Register (04h) and Power Register (03h) default to '0' because the Calibration register defaults to '0', yielding zero current and power values until the Calibration register is programmed.