Home Amplifiers Current-sense amplifiers Digital power monitors
Home
Amplifiers
Current-sense amplifiers
Digital power monitors

INA229

ACTIVE

85-V, 20-bit, ultra-precise, SPI output current/voltage/power/energy/charge monitor with alert

Order now
Data sheet

INA229

ACTIVE
Data sheet Order now

Product details

Common-mode voltage (max) (V) 85 Common-mode voltage (min) (V) -0.3 Input offset (±) (max) (µV) 1 Input offset drift (±) (max) (µV/°C) 0.01 Input offset drift (±) (typ) (µV/°C) 0.002 Voltage gain (V/V) 1 CMRR (min) (dB) 154 Bandwidth (kHz) 10 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 1.1 Digital interface SPI Gain error (%) 0.05 Gain error drift (±) (max) (ppm/°C) 20 Features Alert Function, Bi-directional, Digital Temp Monitor, Integrated Power Accumulator, Integrated Power Monitor, Low-side Capable, Ultra precise Number of channels 1 Resolution (Bits) 20 Power measurement accuracy (%) 0.5 Rating Catalog Operating temperature range (°C) -40 to 125
Common-mode voltage (max) (V) 85 Common-mode voltage (min) (V) -0.3 Input offset (±) (max) (µV) 1 Input offset drift (±) (max) (µV/°C) 0.01 Input offset drift (±) (typ) (µV/°C) 0.002 Voltage gain (V/V) 1 CMRR (min) (dB) 154 Bandwidth (kHz) 10 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 1.1 Digital interface SPI Gain error (%) 0.05 Gain error drift (±) (max) (ppm/°C) 20 Features Alert Function, Bi-directional, Digital Temp Monitor, Integrated Power Accumulator, Integrated Power Monitor, Low-side Capable, Ultra precise Number of channels 1 Resolution (Bits) 20 Power measurement accuracy (%) 0.5 Rating Catalog Operating temperature range (°C) -40 to 125
VSSOP (DGS) 10 14.7 mm² 3 x 4.9
  • High-resolution, 20-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset voltage: ±1 µV (maximum)
    • Offset drift: ±0.01 µV/°C (maximum)
    • Gain error: ±0.05% (maximum)
    • Gain error drift: ±20 ppm/°C (maximum)
    • Common mode rejection: 154 dB (minimum)
  • Power monitoring accuracy:
    • 0.5% full scale, –40°C to +125°C (maximum)
  • Energy and charge accuracy:
    • 1.0% full scale (maximum)
  • Fast alert response: 75 µs
  • Wide common-mode range: –0.3 V to +85 V
  • Bus voltage sense input: 0 V to 85 V
  • Shunt full-scale differential range: ±163.84 mV / ±40.96 mV
  • Input bias current: 2.5 nA (maximum)
  • Temperature sensor: ±1°C (maximum at 25°C)
  • Programmable resistor temperature compensation
  • Programmable conversion time and averaging
  • 10-MHz SPI communication interface
  • Operates from a 2.7-V to 5.5-V supply:
    • Operational current: 640 µA (typical)
    • Shutdown current: 5 µA (maximum)
  • High-resolution, 20-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset voltage: ±1 µV (maximum)
    • Offset drift: ±0.01 µV/°C (maximum)
    • Gain error: ±0.05% (maximum)
    • Gain error drift: ±20 ppm/°C (maximum)
    • Common mode rejection: 154 dB (minimum)
  • Power monitoring accuracy:
    • 0.5% full scale, –40°C to +125°C (maximum)
  • Energy and charge accuracy:
    • 1.0% full scale (maximum)
  • Fast alert response: 75 µs
  • Wide common-mode range: –0.3 V to +85 V
  • Bus voltage sense input: 0 V to 85 V
  • Shunt full-scale differential range: ±163.84 mV / ±40.96 mV
  • Input bias current: 2.5 nA (maximum)
  • Temperature sensor: ±1°C (maximum at 25°C)
  • Programmable resistor temperature compensation
  • Programmable conversion time and averaging
  • 10-MHz SPI communication interface
  • Operates from a 2.7-V to 5.5-V supply:
    • Operational current: 640 µA (typical)
    • Shutdown current: 5 µA (maximum)

The INA229 is an ultra-precise digital power monitor with a 20-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure a full-scale differential input of ±163.84 mV or ±40.96 mV across a resistive shunt sense element with common-mode voltage support from –0.3 V to +85 V.

The INA229 reports current, bus voltage, temperature, power , energy and charge accumulation while employing a precision ±0.5% integrated oscillator, all while performing the needed calculations in the background. The integrated temperature sensor is ±1°C accurate for die temperature measurement and is useful in monitoring the system ambient temperature.

The low offset and gain drift design of the INA229 allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing. Further, the very low offset voltage and noise allow for use in mA to kA sensing applications and provide a wide dynamic range without significant power dissipation losses on the sensing shunt element. The low input bias current of the device permits the use of larger current-sense resistors, thus providing accurate current measurements in the micro-amp range.

The device allows for selectable ADC conversion times from 50 µs to 4.12 ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.

The INA229 is an ultra-precise digital power monitor with a 20-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure a full-scale differential input of ±163.84 mV or ±40.96 mV across a resistive shunt sense element with common-mode voltage support from –0.3 V to +85 V.

The INA229 reports current, bus voltage, temperature, power , energy and charge accumulation while employing a precision ±0.5% integrated oscillator, all while performing the needed calculations in the background. The integrated temperature sensor is ±1°C accurate for die temperature measurement and is useful in monitoring the system ambient temperature.

The low offset and gain drift design of the INA229 allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing. Further, the very low offset voltage and noise allow for use in mA to kA sensing applications and provide a wide dynamic range without significant power dissipation losses on the sensing shunt element. The low input bias current of the device permits the use of larger current-sense resistors, thus providing accurate current measurements in the micro-amp range.

The device allows for selectable ADC conversion times from 50 µs to 4.12 ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.
open-in-new Find other Digital power monitors
Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Drop-in replacement with upgraded functionality to the compared device
INA239 ACTIVE 85-V, 16-bit, high-precision, SPI output current/voltage/power monitor with alert Pin-to-pin with reduced 16-bit performance.
Same functionality with different pin-out to the compared device
INA228 ACTIVE 85-V, 20-bit, ultra-precise, I2C output current/voltage/power/energy/charge monitor with alert Similar 20-bit performance with I2C interface.

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 9
Type Title Date
* Data sheet INA229 85-V, 20-Bit, Ultra-Precise Power/Energy/Charge Monitor With SPI Interface datasheet (Rev. A) PDF | HTML 11 May 2022
EVM User's guide INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide (Rev. E) PDF | HTML 17 Aug 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 note Integrating the Current Sensing Signal Path (Rev. B) PDF | HTML 29 Sep 2021
Application note 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
Certificate INA229EVM EU RoHS Declaration of Conformity (DoC) (Rev. A) 16 Dec 2020
Application note Energy and Power Monitoring with Digital Current Sensors 25 May 2017

Design & development

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

Evaluation board

INA229_239EVM — INA229 & INA239 evaluation module

This evaluation module (EVM) is an easy-to-use platform to evaluate the main features and performance of the INA229 or INA239.

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
View options
IDE, configuration, compiler or debugger

ASC-STUDIO-INA229 — ASC studio (SysConfig) for configuring all aspects of the INA229 current sensor

SysConfig can be used to help simplify configuration challenges and accelerate software development with the INA229 current sensor.
Supported products & hardware

Supported products & hardware

Products
Digital power monitors
INA229 — 85-V, 20-bit, ultra-precise, SPI output current/voltage/power/energy/charge monitor with alert INA229-Q1 — AEC-Q100, 85-V, 20-bit, ultraprecise, SPI output current/voltage/power/energy/charge monitor
Launch
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 (...)
Download
Calculation tool

Power Monitor Tool

SBOR021.ZIP (266 KB)
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 (...)
Request
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
View options
Package Pins Download
VSSOP (DGS) 10 View options
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos