SBOS547A June 2011  – August 2015 INA226

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1Basic ADC Functions
        1. 7.3.1.1Power Calculation
        2. 7.3.1.2Alert Pin
    4. 7.4Device Functional Modes
      1. 7.4.1Averaging and Conversion Time Considerations
      2. 7.4.2Filtering and Input Considerations
    5. 7.5Programming
      1. 7.5.1Programming the Calibration Register
      2. 7.5.2Programming the Power Measurement Engine
        1. 7.5.2.1Calibration Register and Scaling
      3. 7.5.3Simple Current Shunt Monitor Usage (No Programming Necessary)
      4. 7.5.4Default Settings
      5. 7.5.5Bus Overview
        1. 7.5.5.1Serial Bus Address
        2. 7.5.5.2Serial Interface
        3. 7.5.5.3Writing to and Reading from the INA226
          1. 7.5.5.3.1High-Speed I2C Mode
        4. 7.5.5.4SMBus Alert Response
    6. 7.6Register Maps
      1. 7.6.1 Configuration Register (00h) (Read/Write)
      2. 7.6.2 Shunt Voltage Register (01h) (Read-Only)
      3. 7.6.3 Bus Voltage Register (02h) (Read-Only)
      4. 7.6.4 Power Register (03h) (Read-Only)
      5. 7.6.5 Current Register (04h) (Read-Only)
      6. 7.6.6 Calibration Register (05h) (Read/Write)
      7. 7.6.7 Mask/Enable Register (06h) (Read/Write)
      8. 7.6.8 Alert Limit Register (07h) (Read/Write)
      9. 7.6.9 Manufacturer ID Register (FEh) (Read-Only)
      10. 7.6.10Die ID Register (FFh) (Read-Only)
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Applications
      1. 8.2.1High-Side Sensing Circuit Application
        1. 8.2.1.1Design Requirements
        2. 8.2.1.2Detailed Design Procedure
        3. 8.2.1.3Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Device Support
      1. 11.1.1Development Support
    2. 11.2Community Resources
    3. 11.3Trademarks
    4. 11.4Electrostatic Discharge Caution
    5. 11.5Glossary
  12. 12Mechanical, Packaging, and Orderable Information

1 Features

  • Senses Bus Voltages From 0 V to 36 V
  • High-Side or Low-Side Sensing
  • Reports Current, Voltage, and Power
  • High Accuracy:
    • 0.1% Gain Error (Max)
    • 10 μV Offset (Max)
  • Configurable Averaging Options
  • 16 Programmable Addresses
  • Operates from 2.7-V to 5.5-V Power Supply
  • 10-Pin, DGS (VSSOP) Package

2 Applications

  • Servers
  • Telecom Equipment
  • Computing
  • Power Management
  • Battery Chargers
  • Power Supplies
  • Test Equipment

3 Description

The INA226 is a current shunt and power monitor with an I2C™- or SMBUS-compatible interface. The device monitors both a shunt voltage drop and bus supply voltage. Programmable calibration value, conversion times, and averaging, combined with an internal multiplier, enable direct readouts of current in amperes and power in watts.

The INA226 senses current on common-mode bus voltages that can vary from 0 V to 36 V, independent of the supply voltage. The device operates from a single 2.7-V to 5.5-V supply, drawing a typical of 330 μA of supply current. The device is specified over the operating temperature range between –40°C and 125°C and features up to 16 programmable addresses on the I2C-compatible interface.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
INA226VSSOP (10)3.00 mm x 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

High-Side or Low-Side Sensing Application

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