Top

Product details

Parameters

Common mode voltage (Max) (V) 85 Common mode voltage (Min) (V) -0.3 Input offset (+/-) (Max) (uV) 1 Input offset drift (+/-) (Typ) (uV/C) 0.05 Gain (V/V) 1 Gain error (%) 0.1 Gain error drift (+/-) (Max) (ppm/°C) 20 CMRR (Min) (dB) 140 Bandwidth (kHz) 10 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 1.2 Digital interface SPI Features Alert Function, Bi-directional, Integrated Power Accumulator, Integrated Power Monitor, Low-side Capable Resolution (Bits) 20 Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Current/voltage/power monitors

Package | Pins | Size

VSSOP (DGS) 10 open-in-new Find other Current/voltage/power monitors

Features

  • 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)

All trademarks are the property of their respective owners.

open-in-new Find other Current/voltage/power monitors

Description

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 it 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 Current/voltage/power monitors
Download

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 11
Type Title Date
* Datasheet INA229 85-V, 20-Bit, Ultra-Precise Power/Energy/Charge Monitor With SPI Interface datasheet Dec. 23, 2020
User guide INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide (Rev. B) Dec. 23, 2020
More literature INA229EVM EU RoHS Declaration of Conformity (DoC) (Rev. A) Dec. 16, 2020
Technical articles A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Application note Digital Interfaces for Current Sensing Devices Jun. 30, 2017
Technical articles System trade-offs for high- and low-side current measurements Jun. 01, 2017
Application note Energy and Power Monitoring with Digital Current Sensors May 25, 2017
Application note Integrated, Current Sensing Analog-to-Digital Converter Dec. 21, 2016
Application note Integrating The Current Sensing Signal Path (Rev. A) Dec. 02, 2016
Technical articles Why should you care about overcurrent protection in your system? Jun. 16, 2016
Technical articles How to get started with current sense amplifiers – part 2 May 26, 2015

Design & development

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

Hardware development

EVALUATION BOARD Download
Description
This evaluation module (EVM) is an easy-to-use platform for evaluating the main features and performance of the INA229 or INA239.

The EVM supports current measurements up to 10-amps and comes with graphical user interface (GUI) support for reading and writing to device registers.
Features
  • GUI support to read and write device registers
  • Detachable EVM for custom use cases
  • Conveniently powered from a common micro-USB connector

Design tools & simulation

SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOL Download
SPICE-based analog simulation program
TINA-TI 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 (...)

CAD/CAE symbols

Package Pins Download
VSSOP (DGS) 10 View options

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

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