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INA231 Dataheets PDF



Part Number INA231
Manufacturers Texas Instruments
Logo Texas Instruments
Description Bidirectional Current and Power Monitor
Datasheet INA231 DatasheetINA231 Datasheet (PDF)

Product Folder Order Now Technical Documents Tools & Software Support & Community INA231 SBOS644C – FEBRUARY 2013 – REVISED MARCH 2018 INA231 High- or Low-Side Measurement, Bidirectional Current and Power Monitor With 1.8-V I2C Interface 1 Features •1 Bus Voltage Sensing From 0 V to 28 V • High- or Low-Side Sensing • Current, Voltage, and Power Reporting • High Accuracy: – 0.5% Gain Error (Max) – 50-μV Offset (Max) • Configurable Averaging Options • Programmable Alert Threshold • 1.8-V I2C.

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Product Folder Order Now Technical Documents Tools & Software Support & Community INA231 SBOS644C – FEBRUARY 2013 – REVISED MARCH 2018 INA231 High- or Low-Side Measurement, Bidirectional Current and Power Monitor With 1.8-V I2C Interface 1 Features •1 Bus Voltage Sensing From 0 V to 28 V • High- or Low-Side Sensing • Current, Voltage, and Power Reporting • High Accuracy: – 0.5% Gain Error (Max) – 50-μV Offset (Max) • 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. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) INA231A YFF (DSBGA-12) YFD (DSBGA-12) 1.65 mm x 1.39 mm x 0.62 mm 1.65 mm x 1.39 mm x 0.40 mm INA231B YFD (DSBGA-12) 1.65 mm x 1.39 mm x 0.40 mm (1) For all available packages, see the package option addendum at the end of the datasheet. Power Supply (0 V to 28 V) High-or Low-Side Sensing CBYPASS 0.1 mF HighSide Shunt Load LowSide Shunt BUS INA231 V I ADC ´ Power Register Current Register Voltage Register Alert Register VS (Supply Voltage) SDA SCL 2 IC Interface ALERT A0 A1 GND 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. INA231 SBOS644C – FEBRUARY 2013 – REVISED MARCH 2018 www.ti.com Table of Contents 1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Device Comparison Table..................................... 3 6 Pin Configuration and Functions ......................... 3 7 Specifications......................................................... 4 7.1 Absolute Maximum Ratings ...................................... 4 7.2 ESD Ratings.............................................................. 4 7.3 Recommended Operating Conditions....................... 4 7.4 Thermal Information .................................................. 4 7.5 Electrical Characteristics .......................................... 5 7.6 Timing Requirements: I2C Bus.................................. 6 7.7 Typical Characteristics .............................................. 7 8 Detailed Description ............................................ 10 8.1 Overview ................................................................. 10 8.2 Functional Block Diagram ....................................... 10 8.3 Feature Description................................................. 10 8.4 Device Functional Modes........................................ 14 8.5 Programming .......................................................... 15 8.6 Register Maps ......................................................... 22 9 Application and Implementation ........................ 28 9.1 Application Information............................................ 28 9.2 Typical Applications ................................................ 30 10 Power Supply Recommendations ..................... 32 11 Layout................................................................... 32 11.1 Layout Guidelines ................................................. 32 11.2 Layout Example .................................................... 32 12 Device and Documentation Support ................. 33 12.1 Documentation Support ........................................ 33 12.2 Receiving Notification of Documentation Updates 33 12.3 Community Resources.......................................... 33 12.4 Trademarks .........................


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