Product details

Common mode voltage (Max) (V) 26 Common mode voltage (Min) (V) 0 Input offset (+/-) (Max) (uV) 100 Input offset drift (+/-) (Typ) (uV/C) 0.1 Gain (V/V) 1, 0.5, 0.25, 0.125 Gain error (%) 0.5 Gain error drift (+/-) (Max) (ppm/°C) 83 CMRR (Min) (dB) 120 Bandwidth (kHz) 5.5 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 3 Iq (Max) (mA) 1.5 Digital interface I2C, SMBus Features Alert Function, Bi-directional, Low-side Capable, Programmable Gain Resolution (Bits) 12 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) 100 Input offset drift (+/-) (Typ) (uV/C) 0.1 Gain (V/V) 1, 0.5, 0.25, 0.125 Gain error (%) 0.5 Gain error drift (+/-) (Max) (ppm/°C) 83 CMRR (Min) (dB) 120 Bandwidth (kHz) 5.5 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 3 Iq (Max) (mA) 1.5 Digital interface I2C, SMBus Features Alert Function, Bi-directional, Low-side Capable, Programmable Gain Resolution (Bits) 12 Rating Catalog Operating temperature range (C) -40 to 125
TSSOP (PW) 16 22 mm² 4.4 x 5
  • SENSES BUS VOLTAGES FROM 0V TO +26V
  • REPORTS CURRENT, VOLTAGE, AND POWER; STORES PEAKS
  • TRIPLE WATCHDOG LIMITS:
    • Lower Warning with Delay
    • Upper Over-limit, No Delay
    • Fast Analog Critical
  • HIGH ACCURACY: 1% MAX OVER TEMP
  • APPLICATIONS
    • SERVERS
    • TELECOM EQUIPMENT
    • AUTOMOTIVE
    • POWER MANAGEMENT
    • BATTERY CHARGERS
    • WELDING EQUIPMENT
    • POWER SUPPLIES
    • TEST EQUIPMENT

I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.

  • SENSES BUS VOLTAGES FROM 0V TO +26V
  • REPORTS CURRENT, VOLTAGE, AND POWER; STORES PEAKS
  • TRIPLE WATCHDOG LIMITS:
    • Lower Warning with Delay
    • Upper Over-limit, No Delay
    • Fast Analog Critical
  • HIGH ACCURACY: 1% MAX OVER TEMP
  • APPLICATIONS
    • SERVERS
    • TELECOM EQUIPMENT
    • AUTOMOTIVE
    • POWER MANAGEMENT
    • BATTERY CHARGERS
    • WELDING EQUIPMENT
    • POWER SUPPLIES
    • TEST EQUIPMENT

I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.

The INA209 is a high-side current shunt and power monitor with an I2C interface. The INA209 monitors both shunt drop and shunt bus voltage. A programmable calibration value, combined with an internal multiplier, enables direct readouts in amperes. An additional multiplying register calculates power in watts. The INA209 features two separate, onboard watchdog capabilities: a warning comparator and an over-limit comparator. The warning comparator is useful for monitoring lower warning limits and incorporates a user-defined delay. The over-limit comparator assists with monitoring upper limits that could require immediate system shutdown.

The INA209 also includes an analog comparator and a programmable digital-to-analog converter (DAC) that combine to provide the fastest possible responses to current overload conditions.

The INA209 can be used together with hot swap controllers that already use a current sense resistor. The INA209 full-scale range can be selected to be either within the hot-swap controller sense limits, or wide enough to include them.

The INA209 senses across shunts on buses that can vary from 0V to 26V. The device uses a single +3V to +5.5V supply, drawing a maximum of 1.5mA of supply current. It is specified for operation from -25°C to +85°C.

The INA209 is a high-side current shunt and power monitor with an I2C interface. The INA209 monitors both shunt drop and shunt bus voltage. A programmable calibration value, combined with an internal multiplier, enables direct readouts in amperes. An additional multiplying register calculates power in watts. The INA209 features two separate, onboard watchdog capabilities: a warning comparator and an over-limit comparator. The warning comparator is useful for monitoring lower warning limits and incorporates a user-defined delay. The over-limit comparator assists with monitoring upper limits that could require immediate system shutdown.

The INA209 also includes an analog comparator and a programmable digital-to-analog converter (DAC) that combine to provide the fastest possible responses to current overload conditions.

The INA209 can be used together with hot swap controllers that already use a current sense resistor. The INA209 full-scale range can be selected to be either within the hot-swap controller sense limits, or wide enough to include them.

The INA209 senses across shunts on buses that can vary from 0V to 26V. The device uses a single +3V to +5.5V supply, drawing a maximum of 1.5mA of supply current. It is specified for operation from -25°C to +85°C.

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Technical documentation

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Type Title Date
* Data sheet High-Side Measurement, Bi-Directional Current/Power Monitor with I2C Interface datasheet (Rev. B) 27 Mar 2009
Application note Measuring Current for Handle Multiple Out-of-Range Conditions (Rev. C) 04 Oct 2021
Application note Digital Interfaces for Current Sensing Devices (Rev. A) 30 Sep 2021
Application note Integrated, Current Sensing Analog-to-Digital Converter (Rev. A) 28 Sep 2021
Application note Getting Started with Digital Power Monitors (Rev. A) 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
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
User guide INA209EVM User's Guide (Rev. B) 18 May 2016
Application note Understanding the I2C Bus 30 Jun 2015
User guide USB DIG Platform User's Guide (Rev. A) 14 Feb 2010
More literature INA209EVM Quick-Start Guide (Video) (Rev. A) 17 Apr 2008

Design & development

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

Evaluation board

INA209EVM — INA209 evaluation module

The INA209EVM key hardware consists of two boards, INA209 Test Board and USB DIG Platform. The INA209 Test Board contains the INA209, terminal strips for external connections, and several jumpers for device configuration. The USB DIG Platform contains an 8052 microcontroller with a built in USB (...)

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Code example or demo

INA209EVM Source Code (Rev. F)

SBOC251F.ZIP (8385 KB)
Driver or library

INA209SW-LINUX — Linux Driver for INA209

The Linux driver supports the INA209 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:
  • ina209
Linux Source (...)
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 (...)
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 (...)
Calculation tool

Power Monitor Tool

SBOR021.ZIP (266 KB)
Package Pins Download
TSSOP (PW) 16 View options

Ordering & quality

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