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INA3221

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26V, triple channel, 13-bit, i2c output current/voltage monitor w/alerts

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Data sheet

INA3221

ACTIVE
Data sheet Order now

Product details

Common mode voltage (Max) (V) 26 Common mode voltage (Min) (V) 0 Input offset (+/-) (Max) (uV) 80 Input offset drift (+/-) (Typ) (uV/C) 0.1 Gain (V/V) 1 Gain error (%) 0.25 Gain error drift (+/-) (Max) (ppm/°C) 50 CMRR (Min) (dB) 110 Bandwidth (kHz) 3.5 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.35 Digital interface I2C, SMBus Features Alert Function, Bi-directional, Low-side Capable Resolution (Bits) 13 Rating Catalog Operating temperature range (C) -40 to 125
Common mode voltage (Max) (V) 26 Common mode voltage (Min) (V) 0 Input offset (+/-) (Max) (uV) 80 Input offset drift (+/-) (Typ) (uV/C) 0.1 Gain (V/V) 1 Gain error (%) 0.25 Gain error drift (+/-) (Max) (ppm/°C) 50 CMRR (Min) (dB) 110 Bandwidth (kHz) 3.5 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.35 Digital interface I2C, SMBus Features Alert Function, Bi-directional, Low-side Capable Resolution (Bits) 13 Rating Catalog Operating temperature range (C) -40 to 125
VQFN (RGV) 16 16 mm² 4 x 4
  • Senses Bus Voltages From 0 V to 26 V
  • Reports Shunt and Bus Voltage
  • High Accuracy:
    • Offset Voltage: ±80 µV (max)
    • Gain Error: 0.25% (max)
  • Configurable Averaging Options
  • Four Programmable Addresses
  • Programmable Alert and Warning Outputs
  • Power-Supply Operation: 2.7 V to 5.5 V
  • Senses Bus Voltages From 0 V to 26 V
  • Reports Shunt and Bus Voltage
  • High Accuracy:
    • Offset Voltage: ±80 µV (max)
    • Gain Error: 0.25% (max)
  • Configurable Averaging Options
  • Four Programmable Addresses
  • Programmable Alert and Warning Outputs
  • Power-Supply Operation: 2.7 V to 5.5 V

The INA3221 is a three-channel, high-side current and bus voltage monitor with an I2C- and SMBUS-compatible interface. The INA3221 monitors both shunt voltage drops and bus supply voltages, in addition to having programmable conversion times and averaging modes for these signals. The INA3221 offers both critical and warning alerts to detect multiple programmable out-of-range conditions for each channel.

The INA3221 senses current on buses that can vary from 0 V to 26 V. The device is powered from a single 2.7-V to 5.5-V supply, and draws 350 µA (typ) of supply current. The INA3221 is specified over the operating temperature range of –40°C to +125°C. The I2C- and SMBUS-compatible interface features four programmable addresses.

The INA3221 is a three-channel, high-side current and bus voltage monitor with an I2C- and SMBUS-compatible interface. The INA3221 monitors both shunt voltage drops and bus supply voltages, in addition to having programmable conversion times and averaging modes for these signals. The INA3221 offers both critical and warning alerts to detect multiple programmable out-of-range conditions for each channel.

The INA3221 senses current on buses that can vary from 0 V to 26 V. The device is powered from a single 2.7-V to 5.5-V supply, and draws 350 µA (typ) of supply current. The INA3221 is specified over the operating temperature range of –40°C to +125°C. The I2C- and SMBUS-compatible interface features four programmable addresses.
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Technical documentation

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Type Title Date
* Data sheet INA3221 Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor with I2C- and SMBUS-Compatible Interface datasheet (Rev. B) PDF | HTML 22 Mar 2016
Application note Current Sensing Applications in Communication Infrastructure Equipment (Rev. B) PDF | HTML 10 Mar 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
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
Technical article Solving the multidecade current-measurement challenge in your 48-V BMS application 14 Jun 2021
Technical article How current-sense amplifiers monitor satellite health 08 Feb 2021
E-book Simplifying Current Sensing (Rev. A) 09 Jan 2020
Technical article A key to accurate system thermal management: monitoring both current flow and temperature 04 Oct 2018
Technical article System trade-offs for high- and low-side current measurements 01 Jun 2017
Application note Energy and Power Monitoring with Digital Current Sensors 25 May 2017
Application note Understanding the I2C Bus PDF | HTML 30 Jun 2015
EVM User's guide INA3221EVM Evaluation Board and Software Tutorial 23 Apr 2012

Design & development

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

Evaluation board

INA3221EVM — INA3221 Evaluation Module

The INA3221EVM is a platform for evaluating the performance of the INA3221 under various signal, shunt, and supply conditions.

Not available on TI.com
Code example or demo

INA3221EVM Source Code

SBOC424.ZIP (2520 KB)
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Driver or library

INA3221SW-LINUX — Linux Driver for INA3221

The Linux driver supports the INA3221 Triple Current/Power Monitor. The Linux driver supports communication through the I2C bus and interfaces with the Hardware Monitoring sub-system.
Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:
  • ina3221
(...)
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GUI for evaluation module (EVM)

INA3221EVM User Software

SBOC425.ZIP (100553 KB)
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Simulation model

INA3221 IBIS Model

SBOM761.ZIP (56 KB) - IBIS Model
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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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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

Current Sense Amplifier Comparison and Error Tool (Rev. E)

SBOR020E.ZIP (592 KB)
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Calculation tool

Power Monitor Tool

SBOR021.ZIP (266 KB)
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Reference designs

TIDA-050034 — Integrated power supply reference design for NXP i.MX 7D processor

TIDA-050034 is a fully functional development board combining a TI PMIC, TPS65218DO, with NXP i.MX 7Dual Application Processor.

The hardware design consists of DDR3L SDRAM (2x512MB), 64MB Serial NOR Flash, 8GB eMMC 5.0 iNAND, SD Card interface v3.0, 50 pin LCD Connector for external TFT display (...)

Schematic: PDF
Reference designs

TIDA-050038 — Integrated power supply reference design for NXP i.MX 8M mini processor

TIDA-050038 is a system-on-module (SoM) development board integrating two TI PMICs, TPS6521825 and LP873347, with the NXP™ i.MX 8M Mini Application Processor. The hardware design also includes LPDDR4 SDRAM (2GB, x32-bit), QSPI NORFlash (32MB), 16GB eMMC 5.1, 32-kHz RTC oscillator, WiFi + (...)
User guide: PDF
Schematic: PDF
Reference designs

TIDA-050043 — Integrated power supply reference design for NXP i.MX 6ULL processor

This reference design is a fully functional development board powering an NXP™ i.MX 6ULL application processor from a TPS6521815 PMIC. The hardware design consists of DDR3L SDRAM (512 MB), 32-MB Serial NOR Flash, 8-GB eMMC 5.0 iNAND, SD Card interface v3.0, dual-channel 100Base-T Ethernet, (...)
Schematic: PDF
Package Pins Download
VQFN (RGV) 16 View options

Ordering & quality

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