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  • INA231 28-V, 16-Bit, I2C Output Current, Voltage and Power Monitor With Alert in WCSP Package

    • SBOS644D February   2013  – July 2022 INA231

      PRODUCTION DATA  

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  • INA231 28-V, 16-Bit, I2C Output Current, Voltage and Power Monitor With Alert in WCSP Package
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements: I2C Bus
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Basic Analog-to-Digital Converter (ADC) Functions
        1. 8.3.1.1 Power Calculation
        2. 8.3.1.2 ALERT Pin
    4. 8.4 Device Functional Modes
      1. 8.4.1 Averaging and Conversion Time Considerations
    5. 8.5 Programming
      1. 8.5.1 Configure, Measure, and Calculate Example
      2. 8.5.2 Programming the Power Measurement Engine
        1. 8.5.2.1 Calibration Register and Scaling
      3. 8.5.3 Simple Current Shunt Monitor Usage (No Programming Necessary)
      4. 8.5.4 Default INA231 Settings
      5. 8.5.5 Writing to and Reading from the INA231
        1. 8.5.5.1 Bus Overview
          1. 8.5.5.1.1 Serial Bus Address
          2. 8.5.5.1.2 Serial Interface
        2. 8.5.5.2 High-Speed I2C Mode
      6. 8.5.6 SMBus Alert Response
    6. 8.6 Register Maps
      1. 8.6.1 Configuration Register (00h, Read/Write)
        1. 8.6.1.1 AVG Bit Settings [11:9]
        2. 8.6.1.2 VBUS CT Bit Settings [8:6]
        3. 8.6.1.3 VSH CT Bit Settings [5:3]
        4. 8.6.1.4 Mode Settings [2:0]
      2. 8.6.2 Shunt Voltage Register (01h, Read-Only)
      3. 8.6.3 Bus Voltage Register (02h, Read-Only)
      4. 8.6.4 Power Register (03h, Read-Only)
      5. 8.6.5 Current Register (04h, Read-Only)
      6. 8.6.6 Calibration Register (05h, Read/Write)
      7. 8.6.7 Mask/Enable Register (06h, Read/Write)
      8. 8.6.8 Alert Limit Register (07h, Read/Write)
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Filtering and Input Considerations
    2. 9.2 Typical Applications
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  11. 11Mechanical, Packaging, and Orderable Information
  12. IMPORTANT NOTICE

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • YFF|12
  • YFD|12
Thermal pad, mechanical data (Package|Pins)
Orderable Information
  • sbos644d_oa
  • sbos644d_pm
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DATA SHEET

INA231 28-V, 16-Bit, I2C Output Current, Voltage and Power Monitor With Alert in WCSP Package

1 Features

  • Bus voltage sensing from 0 V to 28 V
  • High- or low-side sensing
  • Current, voltage, and power reporting
  • High accuracy:
    • Gain error: 0.5% (maximum)
    • Offset: 50 μV (maximum)
  • Configurable averaging options
  • Programmable alert threshold
  • 1.8-V I2C compliant
  • Power-supply operation: 2.7 V to 5.5 V
  • Start-up mode options:
    • INA231A: active conversion
    • INA231B: low-current power down

2 Applications

  • Smartphones
  • Tablets
  • Servers
  • Computers
  • Power management
  • Battery chargers
  • Power supplies
  • Test equipment

3 Description

The INA231 is a current-shunt and power monitor with a 1.8-V compliant I2C interface that features 16 programmable addresses. The INA231 monitors both shunt voltage drops and bus supply voltage, providing increased protection by asserting the ALERT pin if the values are outside the programmed range. Programmable calibration value, conversion time, and averaging, combined with an internal multiplier, enable direct readouts of current in amperes and power in watts, thus reducing host processing.

The INA231 senses current on bus voltages that vary from 0 V to 28 V, with the device powered from a single 2.7-V to 5.5-V supply, drawing 330 μA (typical) of supply current. The INA231 is specified over the operating temperature range of –40°C to +125°C.

The INA231 is available in two versions: the INA231A starts up performing continuous conversions of the shunt and bus voltage, whereas the INA231B starts up in low-current, power-down mode.

Packaging Information(1)
PART NUMBERPACKAGEBODY SIZE (NOM)
INA231AYFF (DSBGA-12)1.65 mm × 1.39 mm × 0.62 mm
YFD (DSBGA-12)1.65 mm × 1.39 mm × 0.40 mm
INA231BYFD (DSBGA-12)1.65 mm × 1.39 mm × 0.40 mm
(1) For all available packages, see the package option addendum at the end of the datasheet.
GUID-68037877-9B81-4A5D-87DA-5CFF5023A06F-low.gif High-or Low-Side Sensing

4 Revision History

Changes from Revision C (March 2018) to Revision D (July 2022)

  • Updated the numbering format for tables, figures, and cross-references throughout the documentGo
  • Added footnote to B2 and C2 pinsGo
  • Changed value from 40 ms to 40 µs in sentence: Full recovery from power-down mode requires 40 µsGo
  • Moved the Power Supply Recommendations and Layout sections to the Application and Implementation sectionGo

Changes from Revision B (August 2017) to Revision C (March 2018)

  • Added B version device and associated content Go

Changes from Revision A (June 2017) to Revision B (August 2017)

  • Changed NC pin description from "No internal connection" to "Do not connect, leave floating" Go
  • Changed SCL max value from VS + 0.3 V to 6 V in Absolute Maximum Ratings tableGo
  • Added text to end of Layout Guidelines section clarifying no connection of NC pinsGo

Changes from Revision * (February 2013) to Revision A (June 2017)

  • Added Device Information, Recommended Operating Conditions, and ESD Ratings tables, and Detailed Description , Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support , and Mechanical, Packaging, and Orderable Information sectionsGo
  • Added new WSCP-12 (YFD) package with 0.4-mm package height and associated content to data sheetGo
  • Added operating ambient temperature, TA to Absolute Maximum Ratings tableGo
  • Added new note 1 to Timing Requirements: I2C Bus section Go
  • Added test condition to Figure 2 Go

5 Device Comparison

Table 5-1 Device Comparison
DEVICE DESCRIPTION
INA209 Current and power monitor with watchdog, peak-hold, and fast comparator functions
INA210, INA211, INA212, INA213, INA214, INA215 Zerø-drift, low-cost, analog current shunt monitor series in small package
INA219 Zerø-drift, bidirectional current power monitor with two-wire interface
INA226 High or Low-side, bidirectional current and power monitor with two-wire interface and programmable alert

6 Pin Configuration and Functions

Figure 6-1 YFF and YFD Packages12-Pin DSBGATop View
Table 6-1 Pin Functions
PIN TYPE DESCRIPTION
NAME NO.
A0 B3 Digital input Address pin. Connect to GND, SCL, SDA, or VS. Table 8-2 shows pin settings and corresponding addresses.
A1 C3 Digital input Address pin. Connect to GND, SCL, SDA, or VS. Table 8-2 shows pin settings and corresponding addresses.
ALERT A3 Digital output Multi-functional alert, open-drain output.
GND C1 Analog Ground
NC B2, C2(1) — Do not connect, leave floating.
SCL A1 Digital input Serial bus clock line, open-drain input.
SDA A2 Digital input/output Serial bus data line, open-drain input/output.
BUS D1 Analog input Bus voltage input.
IN– D2 Analog input Negative differential shunt voltage input. Connect to load side of shunt resistor.
IN+ D3 Analog input Positive differential shunt voltage input. Connect to supply side of shunt resistor.
VS B1 Analog Power supply pin, 2.7 V to 5.5 V.
(1) Internally, B2 is connected to VS and C2 is connected to GND. Leave floating.

 
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