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INA781

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85-V, 20-bit ultra-precise I²C-output digital power monitor with 400-µΩ EZShunt™ Technology

Product details

Continuous current (max) (A) 75 Common-mode voltage (max) (V) 85 Common-mode voltage (min) (V) -0.1 Input offset current (±) (max) (mA) 5.5 Input offset current drift (±) (typ) (µA/°C) 5 Gain error (%) 0.1 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 1 Digital interface I2C Resolution (Bits) 20 Features Alert Function, Bidirectional, Digital Temp Monitor, Integrated Power Monitor, Integrated Shunt, Low-side Capable Rating Catalog Operating temperature range (°C) -40 to 125
Continuous current (max) (A) 75 Common-mode voltage (max) (V) 85 Common-mode voltage (min) (V) -0.1 Input offset current (±) (max) (mA) 5.5 Input offset current drift (±) (typ) (µA/°C) 5 Gain error (%) 0.1 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 1 Digital interface I2C Resolution (Bits) 20 Features Alert Function, Bidirectional, Digital Temp Monitor, Integrated Power Monitor, Integrated Shunt, Low-side Capable Rating Catalog Operating temperature range (°C) -40 to 125
VSON (DEK) 15 36 mm² 6 x 6
  • Low loss integrated shunt resistor
    • Internal resistance: 400 µΩ, T A = 25°C
    • Continuous current: ±75 A, T A = 25°C
    • Peak measurement capability: ±78.64 A
  • Wide common-mode range: –0.1 V to +85 V
  • High-resolution, 20-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset current: ±5.5 mA, maximum
    • Offset drift: ±25 µA/°C, maximum
    • System gain error: ±0.5% at 50 A
    • System gain error drift: ±25 PPM/°C, typical
    • Common-mode rejection: ±100 µA/V, maximum
  • Power monitoring accuracy:
    • ±0.6% at 25°C, full scale
  • Energy and charge accuracy:
    • ±1.1% at 25°C, full scale
  • Input bias current: 2.5 nA (maximum)
  • Temperature sensor: ±1.5°C (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94-MHz high-speed I 2C 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)
  • Low loss integrated shunt resistor
    • Internal resistance: 400 µΩ, T A = 25°C
    • Continuous current: ±75 A, T A = 25°C
    • Peak measurement capability: ±78.64 A
  • Wide common-mode range: –0.1 V to +85 V
  • High-resolution, 20-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset current: ±5.5 mA, maximum
    • Offset drift: ±25 µA/°C, maximum
    • System gain error: ±0.5% at 50 A
    • System gain error drift: ±25 PPM/°C, typical
    • Common-mode rejection: ±100 µA/V, maximum
  • Power monitoring accuracy:
    • ±0.6% at 25°C, full scale
  • Energy and charge accuracy:
    • ±1.1% at 25°C, full scale
  • Input bias current: 2.5 nA (maximum)
  • Temperature sensor: ±1.5°C (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94-MHz high-speed I 2C 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)

The INA781 is a digital power monitor with an integrated current sensing element along with a 20-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure full-scale currents up to ±78.64 A with common-mode voltage support from –0.1 V to +85 V.

The INA781 reports current, bus voltage, die 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 ±2.5°C accurate over the junction temperature range.

The low offset and gain drift design of the INA781 allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing.

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 INA781 is a digital power monitor with an integrated current sensing element along with a 20-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure full-scale currents up to ±78.64 A with common-mode voltage support from –0.1 V to +85 V.

The INA781 reports current, bus voltage, die 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 ±2.5°C accurate over the junction temperature range.

The low offset and gain drift design of the INA781 allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing.

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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* Data sheet INA781 85 V, 20-Bit, Ultra-Precise I2C Output Digital Power Monitor with EZShunt Technology datasheet PDF | HTML 06 Jul 2023
Technical article Simplifying high-voltage sensing with Hall-effect current sensors 21 Aug 2023
Technical article Bringing design simplicity, low drift, and small size to integrated-shunt solutions 11 Aug 2023
EVM User's guide INA740-INA741EVM, INA745-INA746EVM, INA780-INA781EVM User's Guide PDF | HTML 26 Jun 2023
Certificate INA781EVM EU Declaration of Conformity (DoC) 19 May 2023

Design & development

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

Evaluation board

INA780-INA781EVM — INA780 and INA781 evaluation module for EZShunt™ Digital Power Monitor with built-in s

The INA780 and IN781 evaluation module (EVM) is a compact platform for evaluating the main features and performance of the INA780 or INA781 high-precision, digital power monitors with EZShunt™ Technology across specified input current, common-mode voltage and temperature ranges. (...)

User guide: PDF | HTML
IDE, configuration, compiler or debugger

ASC-STUDIO-INA781 ASC Studio (SysConfig) for configuring all aspects of the INA781 current sensor

SysConfig can be used to help simplify configuration challenges and accelerate software development with the INA781 current sensor.
Supported products & hardware

Supported products & hardware

Products
Digital power monitors with integrated shunt resistor
INA781 85-V, 20-bit ultra-precise I²C-output digital power monitor with 400-µΩ EZShunt™ Technology
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 (...)
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
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