Product details


Common mode voltage (Max) (V) 85 Common mode voltage (Min) (V) -0.3 Input offset (+/-) (Max) (uV) 1 Input offset drift (+/-) (Typ) (uV/C) 0.002 Gain (V/V) 1 Gain error (%) 0.05 Gain error drift (+/-) (Max) (ppm/°C) 20 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 Features Alert Function, Bi-directional, Integrated Power Accumulator, Integrated Power Monitor, Low-side Capable, Ultra precise Resolution (Bits) 20 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (C) -40 to 125 open-in-new Find other Current/voltage/power monitors

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  • High-resolution, 20-bit delta-sigma ADC
  • Wide common mode range: –0.3 V to +85 V
  • Shunt full-scale differential range:
    ±163.84 mV / ± 40.96 mV
  • Bus voltage sense input: 0 V to 85 V
  • Accuracy
    • Offset voltage at 48 VCM: ±2 µV (maximum)
    • Offset voltage at 0 VCM: ±2 µV (maximum)
    • Offset drift: ±0.05 µV/°C (maximum)
    • Gain error: ±0.1% (maximum)
    • Gain error drift: ±20 ppm/°C (maximum)
    • Shunt voltage resolution:
      312.5 nV/LSB / 78.125 nV/LSB
    • Bus voltage resolution: 195.31 µV/LSB
  • Input bias current: 5nA (maximum)
  • Internal temperature sensor: ±2°C (maximum)
  • Internal precision oscillator: ±1% (maximum)
  • Programmable data rate and averaging
  • Reports current, bus voltage, power, internal temperature, energy and charge
  • High-side and low-side applications
  • 10MHz SPI communication interface
  • Operates from a 2.7-V to 5.5-V supply
    • Operational current: 660 µA
    • Shutdown current: 5 µA

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The INA229-Q1 is an ultra-precise digital power monitor with 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 low offset and gain drift design of the INA229-Q1 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 microamp 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-Q1 calculates power, energy and charge accumulation by employing the precision ±1% integrated oscillator, all while performing calculations on a sample-by-sample basis for an accurate result. An integrated temperature sensor with error less than ±2°C provides information about the ambient temperature of the system.

The INA229-Q1 integrates built-in diagnostics to indicate system health status as well as out-of-range conditions. This indication is provided by using the open-drain ALERT pin.

The INA229-Q1 operates from a single supply of 2.7-V to 5.5-V supply, drawing less than 660-µA current during operation and with less than 5-µA current during shutdown. Configurable continuous or single-shot triggered measurement provides further current consumption reduction. The output can be interfaced to an MCU or a battery management System-on-Chip devices through the 4-wire SPI interface.

The device is specified over the operating range –40°C and +125°C.

open-in-new Find other Current/voltage/power monitors
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Same functionality and pinout but is not an equivalent to the compared device:
NEW INA239-Q1 PREVIEW AEC-Q100, 85V, 16-bit, high-precision, SPI output current/voltage/power monitor The INA239 has reduced accuracy and functionality at a lower price
Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
NEW INA228-Q1 PREVIEW AEC-Q100, 85-V, 20-bit, ultra-precise, I2C output current/voltage/power/energy/charge monitor The INA228 has the same functionality and performance but with an I2C interface

Technical documentation

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Type Title Date
* Datasheet INA229-Q1 85-V, 20-Bit, Ultra-Precise Power/Energy/Charge Monitor With SPI Interface datasheet May 11, 2020
Application note Getting Started with Digital Power Monitors Mar. 12, 2021
Technical article How current-sense amplifiers monitor satellite health Feb. 08, 2021
Application note Shunt-Based Current-Sensing Solutions for BMS Applications in HEVs and EVs (Rev. B) Feb. 02, 2021
Functional safety information INA2x9-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA Jul. 17, 2020
Technical article A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Technical article Understanding current sensing in HEV/EV batteries Aug. 02, 2017
Application note Digital Interfaces for Current Sensing Devices Jun. 30, 2017
Technical article 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

Design & development

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

Hardware development

document-generic User guide
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.
  • 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

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 (...)
  • 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
  • (...)
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 (...)
document-generic User guide
SBOR020A.ZIP (525 KB)
SBOR021.ZIP (266 KB)

CAD/CAE symbols

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Ordering & quality

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