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Product details

Parameters

Common mode voltage (Max) (V) 85 Common mode voltage (Min) (V) -0.3 Input offset (+/-) (Max) (uV) 50 Input offset drift (+/-) (Typ) (uV/C) 0.5 Gain (V/V) 1 Gain error (%) 0.3 Gain error drift (+/-) (Max) (ppm/°C) 50 CMRR (Min) (dB) 126 Bandwidth (kHz) 10 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 1.2 Digital interface I2C, SMBus Features Alert Function, Bi-directional, Integrated Power Monitor, Low-side Capable Resolution (Bits) 16 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

Package | Pins | Size

VSSOP (DGS) 10 9 mm² 3 x 3 open-in-new Find other Current/voltage/power monitors

Features

  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • High-resolution, 16-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset voltage: ±50 µV (maximum)
    • Offset drift: ±0.02 µV/°C (maximum)
    • Gain error: ±0.3% (maximum)
    • Gain error drift: ±50 ppm/°C (maximum)
    • Common mode rejection: 120 dB (minimum)
  • Power monitoring accuracy:
    • 1.6% 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
  • 2.94-MHz high-speed I2C interface with 16 pin-selectable addresses
  • 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 INA237-Q1 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 INA237-Q1 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 INA237-Q1 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 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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NEW INA228-Q1 ACTIVE AEC-Q100, 85-V, 20-bit, ultraprecise, I²C output current/voltage/power/energy/charge monitor The INA228 has the additional functionality combined with improved performance
NEW INA238-Q1 ACTIVE AEC-Q100, 85-V, 16-bit, high-precision, I²C output current/voltage/charge monitor The INA238 has the same functionality with improved performance
Same functionality with different pin-out to the compared device.
NEW INA239-Q1 ACTIVE AEC-Q100, 85-V, 16-bit, high-precision, SPI output current/voltage/power monitor The INA239 has the same functionality and improved performance but with an SPI interface

Technical documentation

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Type Title Date
* Data sheet INA237-Q1 AEC-Q100, 85-V, 16-Bit, Precision Power Monitor With I2C Interface datasheet (Rev. A) Jun. 29, 2021
Technical article Solving the multidecade current-measurement challenge in your 48-V BMS application Jun. 14, 2021
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 INA2xx-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA Nov. 02, 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
Application note Understanding the I2C Bus Jun. 30, 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
document-generic User guide
Description
This evalation module (EVM) is an easy-to-use platform for evaluating the main features and performance of the INA228, INA237 or INA238.

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
SBOR020C.ZIP (568 KB)
CALCULATION TOOL Download
SBOR021.ZIP (266 KB)

CAD/CAE symbols

Package Pins Download
VSSOP (DGS) 10 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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