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INA239

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85-V, 16-bit, high-precision, SPI output current/voltage/power monitor with alert

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Product details

Parameters

Common mode voltage (Max) (V) 85 Common mode voltage (Min) (V) -0.3 Input offset (+/-) (Max) (uV) 5 Input offset drift (+/-) (Typ) (uV/C) 0.002 Gain (V/V) 1 Gain error (%) 0.1 Gain error drift (+/-) (Max) (ppm/°C) 25 CMRR (Min) (dB) 140 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, High precision, Integrated Power Monitor, Low-side Capable Resolution (Bits) 16 Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Current/voltage/power monitors

Package | Pins | Size

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Features

  • High-resolution, 16-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset voltage: ±5 µV (maximum)
    • Offset drift: ±0.02 µV/°C (maximum)
    • Gain error: ±0.1% (maximum)
    • Gain error drift: ±25 ppm/°C (maximum)
    • Common mode rejection: 140 dB (minimum)
  • Power monitoring accuracy:
    • 0.7 % full scale, –40 °C to 125 °C (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 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)

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Description

The INA239 is an ultra-precise digital power monitor with a 16-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 INA239 reports current, bus voltage, temperature, and power, 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 INA239 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 A 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.

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Technical documentation

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Type Title Date
* Datasheet INA239 85-V, 16-Bit, High-Precision Power Monitor With SPI Interface datasheet Jan. 28, 2021
Application note Getting Started with Digital Power Monitors Mar. 12, 2021
Technical article How current-sense amplifiers monitor satellite health Feb. 08, 2021
User guide INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide (Rev. B) Dec. 23, 2020
More literature INA239EVM EU RoHS Declaration of Conformity (DoC) (Rev. A) Dec. 16, 2020
Technical article 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 article System trade-offs for high- and low-side current measurements Jun. 01, 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 article Why should you care about overcurrent protection in your system? Jun. 16, 2016

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
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 (...)
document-generic User guide
CALCULATION TOOL Download
SBOR021.ZIP (266 KB)

CAD/CAE symbols

Package Pins Download
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Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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