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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 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 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 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 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 x 1.388 DSBGA (YFF) 12 2.52000000000000018 mm² 1.4000000000000001 x 1.8
  • 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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Top documentation Type Title Format options Date
* Data sheet INA231 28-V, 16-Bit, I2C Output Current, Voltage and Power Monitor With Alert in WCSP Package datasheet (Rev. D) PDF | HTML 13 Jul 2022
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 18 Nov 2024
E-book An Engineer's Guide to Current Sensing (Rev. B) 12 Apr 2022
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Application note Digital Interfaces for Current Sensing Devices (Rev. A) PDF | HTML 30 Sep 2021
Application brief Integrating the Current Sensing Signal Path (Rev. B) PDF | HTML 29 Sep 2021
Application brief Integrated, Current Sensing Analog-to-Digital Converter (Rev. A) PDF | HTML 28 Sep 2021
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 2021
Application note Getting Started with Digital Power Monitors (Rev. A) PDF | HTML 02 Sep 2021
Application brief Precision, Low-Side Current Measurement (Rev. B) 06 Mar 2019
Application brief External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) 19 Feb 2019
Design guide –48-V Telecom Current, Voltage, and Power Sense With Isolation Reference Design (Rev. A) 28 Sep 2017
Application brief Energy and Power Monitoring with Digital Current Sensors 25 May 2017
Application note Understanding the I2C Bus PDF | HTML 30 Jun 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
Not available on TI.com
GUI for evaluation module (EVM)

SBOC434 — INA231EVM Rev A Software

INA231EVM Rev A Software
Supported products & hardware

Supported products & hardware
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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 (...)

Supported products & hardware

Supported products & hardware
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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 (...)
Supported products & hardware

Supported products & hardware
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Calculation tool

SBOR021 — Power Monitor Tool

Power Monitor Tool
Supported products & hardware

Supported products & hardware
Download
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
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Reference designs

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 (...)
Design guide: PDF
Reference designs

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 (...)
Design guide: PDF
Schematic: PDF
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DSBGA (YFD) 12 Ultra Librarian
DSBGA (YFF) 12 Ultra Librarian
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