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INA209

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26V, 12-bit, i2c output current/voltage/power monitor w/ analog comparator

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Data sheet

INA209

ACTIVE
Data sheet Order now

Product details

Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) 0 Digital interface I2C, SMBus Resolution (Bits) 12 Input offset (±) (max) (µV) 100 Input offset drift (±) (max) (µV/°C) 0.5 Input offset drift (±) (typ) (µV/°C) 0.1 Voltage gain (V/V) 0.125, 0.25, 0.5, 1 CMRR (min) (dB) 120 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 3 Iq (max) (mA) 1.5 Gain error (%) 0.5 Gain error drift (±) (max) (ppm/°C) 83, 167 Features Alert Function, Bidirectional, Intergrated Power Monitor, Low-side Capable, Programmable Gain Number of channels 1 Power measurement accuracy (%) 1 Rating Catalog Operating temperature range (°C) -40 to 125
Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) 0 Digital interface I2C, SMBus Resolution (Bits) 12 Input offset (±) (max) (µV) 100 Input offset drift (±) (max) (µV/°C) 0.5 Input offset drift (±) (typ) (µV/°C) 0.1 Voltage gain (V/V) 0.125, 0.25, 0.5, 1 CMRR (min) (dB) 120 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 3 Iq (max) (mA) 1.5 Gain error (%) 0.5 Gain error drift (±) (max) (ppm/°C) 83, 167 Features Alert Function, Bidirectional, Intergrated Power Monitor, Low-side Capable, Programmable Gain Number of channels 1 Power measurement accuracy (%) 1 Rating Catalog Operating temperature range (°C) -40 to 125
TSSOP (PW) 16 32 mm² 5 x 6.4
  • 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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Top documentation Type Title Format options Date
* Data sheet High-Side Measurement, Bi-Directional Current/Power Monitor with I2C Interface datasheet (Rev. B) 27 Mar 2009
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 18 Nov 2024
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Application brief Measuring Current for Handle Multiple Out-of-Range Conditions (Rev. C) PDF | HTML 04 Oct 2021
Application note Digital Interfaces for Current Sensing Devices (Rev. A) PDF | HTML 30 Sep 2021
Application brief Integrated, Current Sensing Analog-to-Digital Converter (Rev. A) PDF | HTML 28 Sep 2021
Application note Getting Started with Digital Power Monitors (Rev. A) PDF | HTML 02 Sep 2021
Application note Understanding the I2C Bus PDF | HTML 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.

Code example or demo

SBOC251 — INA209EVM Source Code

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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:
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Linux Source (...)
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GUI for evaluation module (EVM)

SBOC248 — INA209EVM Software

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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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Supported products & hardware
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Calculation tool

SBOR021 — Power Monitor Tool

Power Monitor Tool
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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 (...)
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TSSOP (PW) 16 Ultra Librarian
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