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INA231

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28V, 16-bit, i2c output current/voltage/power monitor w/alert in wcsp

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Data sheet

INA231

ACTIVE
Data sheet Order now

Product details

Common-mode voltage (max) (V) 28 Common-mode voltage (min) (V) 0 Digital interface I2C, SMBus Resolution (Bits) 16 Input offset (±) (max) (µV) 50 Input offset drift (±) (max) (µV/°C) 0.5 Input offset drift (±) (typ) (µV/°C) 0.1 Voltage gain (V/V) 1 CMRR (min) (dB) 100 Iq (max) (mA) 0.42 Gain error (%) 0.5 Gain error drift (±) (max) (ppm/°C) 50 Features Alert Function, Bidirectional, Intergrated Power Monitor, Low-side Capable Number of channels 1 Power measurement accuracy (%) 1 Rating Catalog Operating temperature range (°C) -40 to 125
Common-mode voltage (max) (V) 28 Common-mode voltage (min) (V) 0 Digital interface I2C, SMBus Resolution (Bits) 16 Input offset (±) (max) (µV) 50 Input offset drift (±) (max) (µV/°C) 0.5 Input offset drift (±) (typ) (µV/°C) 0.1 Voltage gain (V/V) 1 CMRR (min) (dB) 100 Iq (max) (mA) 0.42 Gain error (%) 0.5 Gain error drift (±) (max) (ppm/°C) 50 Features Alert Function, Bidirectional, Intergrated Power Monitor, Low-side Capable Number of channels 1 Power measurement accuracy (%) 1 Rating Catalog Operating temperature range (°C) -40 to 125
DSBGA (YFD) 12 2.28326 mm² (1.645 mm × 1.388 mm) DSBGA (YFF) 12 2.52000000000000018 mm² (— mm × — mm)
  • 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
  • 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

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.

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.
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Technical documentation

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* Data sheet INA231 28-V, 16-Bit, I2C Output Current, Voltage and Power Monitor With Alert in WCSP Package datasheet (Rev. D) PDF | HTML Jul 13, 2022
Application note Using a PCB Copper Trace as a Current Sense Shunt Resistor (Rev. A) PDF | HTML Apr 27, 2026
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML Nov 18, 2024
E-book An Engineer's Guide to Current Sensing (Rev. B) Apr 12, 2022
Application note Digital Interfaces for Current Sensing Devices (Rev. A) PDF | HTML Sep 30, 2021
Application brief Integrating the Current Sensing Signal Path (Rev. B) PDF | HTML Sep 29, 2021
Application brief Integrated, Current Sensing Analog-to-Digital Converter (Rev. A) PDF | HTML Sep 28, 2021
Selection guide Current Sense Amplifiers (Rev. E) Sep 20, 2021
Application note Getting Started with Digital Power Monitors (Rev. A) PDF | HTML Sep 2, 2021
Application brief Precision, Low-Side Current Measurement (Rev. B) Mar 6, 2019
Application brief External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) Feb 19, 2019
Design guide –48-V Telecom Current, Voltage, and Power Sense With Isolation Reference Design (Rev. A) Sep 28, 2017
Application brief Energy and Power Monitoring with Digital Current Sensors May 25, 2017
Application note Understanding the I2C Bus PDF | HTML Jun 30, 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

INA231EVM — INA231 evaluation module

The INA231 Evaluation Module (EVM) is an easy-to-use platform to evaluate the main features and performance of the INA231 device.

The EVM supports current measurements up to 10-A and comes with graphical user interface (GUI) support to read and write to device registers.

User guide: PDF | HTML
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GUI for evaluation module (EVM)

SBOC434 — INA231EVM Rev A Software

INA231EVM Rev A Software
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Simulation model

INA231 IBIS Model

SBOM805.ZIP (45 KB) - IBIS model
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Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

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Calculation tool

CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
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Calculation tool

SBOR021 — Power Monitor Tool

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Reference design

TIDA-010057 — Ultrasound smart probe power supply reference design

Significant technological advancements and high degree of integration in Medical imaging, especially hand-held ultrasound smart probes, are pushing engineers to come up with highly-efficient, noise immune power solutions in a small size. This reference design documents end to end power and data (...)
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Reference design

TIDA-010269 — Handheld ultrasound imaging device power supply reference design

This reference design is built to power the next generation 128-channel ultrasound smart probe that adopts our new generation transmitter and receiver. The compact size (88mm × 45mm × 20mm) includes all power functions for a 128-channel smart probe with >80% efficiency. This transformerless (...)
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DSBGA (YFD) 12 Ultra Librarian
DSBGA (YFF) 12 Ultra Librarian
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