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Monitores de potencia digitales

INA238

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Monitor de corriente/tensión/potencia de salida I2C de 85 V, 16 bits y alta precisión con alerta<

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INA238

ACTIVO
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Detalles del producto

Common-mode voltage (max) (V) 85 Common-mode voltage (min) (V) -0.3 Digital interface I2C Resolution (Bits) 16 Input offset (±) (max) (µV) 5 Input offset drift (±) (max) (µV/°C) 0.02 Input offset drift (±) (typ) (µV/°C) 0.002 Voltage gain (V/V) 1 CMRR (min) (dB) 140 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 1.1 Gain error (%) 0.1 Gain error drift (±) (max) (ppm/°C) 25 Features Alert Function, Bidirectional, Digital Temp Monitor, High precision, I2C, Integrated Power Monitor, Low-side Capable Number of channels 1 Power measurement accuracy (%) 0.2 Rating Catalog Operating temperature range (°C) -40 to 125
Common-mode voltage (max) (V) 85 Common-mode voltage (min) (V) -0.3 Digital interface I2C Resolution (Bits) 16 Input offset (±) (max) (µV) 5 Input offset drift (±) (max) (µV/°C) 0.02 Input offset drift (±) (typ) (µV/°C) 0.002 Voltage gain (V/V) 1 CMRR (min) (dB) 140 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 1.1 Gain error (%) 0.1 Gain error drift (±) (max) (ppm/°C) 25 Features Alert Function, Bidirectional, Digital Temp Monitor, High precision, I2C, Integrated Power Monitor, Low-side Capable Number of channels 1 Power measurement accuracy (%) 0.2 Rating Catalog Operating temperature range (°C) -40 to 125
VSSOP (DGS) 10 14.7 mm² 3 x 4.9
  • High-resolution, 16-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset voltage: ±5µV (maximum)
    • Offset drift: ±0.02µV/°C (maximum)
    • Gain error: ±0.1% (maximum)
    • Gain error drift: ±25ppm/°C (maximum)
    • Common mode rejection: 140dB (minimum)
  • Power monitoring accuracy:
    • 0.7% full scale, –40°C to +125°C (maximum)
  • Fast alert response: 75µs
  • Wide common-mode range: –0.3V to +85V
  • Bus voltage sense input: 0V to 85V
  • Shunt full-scale differential range: ±163.84mV / ±40.96mV
  • Input bias current: 2.5nA (maximum)
  • Temperature sensor: ±1°C (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94MHz high-speed I2C interface with 16 pin-selectable addresses
  • Operates from a 2.7V to 5.5V supply:
    • Operational current: 640µA (typical)
    • Shutdown current: 5µA (maximum)
  • High-resolution, 16-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset voltage: ±5µV (maximum)
    • Offset drift: ±0.02µV/°C (maximum)
    • Gain error: ±0.1% (maximum)
    • Gain error drift: ±25ppm/°C (maximum)
    • Common mode rejection: 140dB (minimum)
  • Power monitoring accuracy:
    • 0.7% full scale, –40°C to +125°C (maximum)
  • Fast alert response: 75µs
  • Wide common-mode range: –0.3V to +85V
  • Bus voltage sense input: 0V to 85V
  • Shunt full-scale differential range: ±163.84mV / ±40.96mV
  • Input bias current: 2.5nA (maximum)
  • Temperature sensor: ±1°C (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94MHz high-speed I2C interface with 16 pin-selectable addresses
  • Operates from a 2.7V to 5.5V supply:
    • Operational current: 640µA (typical)
    • Shutdown current: 5µA (maximum)

The INA238 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 ±163.84mV or ±40.96mV across a resistive shunt sense element with common-mode voltage support from –0.3V to +85V.

The INA238 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 INA238 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 50µs to 4.12ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.

The INA238 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 ±163.84mV or ±40.96mV across a resistive shunt sense element with common-mode voltage support from –0.3V to +85V.

The INA238 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 INA238 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 50µs to 4.12ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.
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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Fecha
* Data sheet INA238 85V, 16 -Bit, High-Precision Power Monitor With I2C Interface datasheet (Rev. B) PDF | HTML 29 may 2025
Application note Closed Loop Constant Power Drive to Simplify Heater Element Control and Extend Battery Life PDF | HTML 29 ene 2025
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 18 nov 2024
Application brief Improving Power Amplifier Efficiency With Current Monitors (Rev. B) PDF | HTML 24 jul 2023
Application brief How to optimize PoE systems using discrete current sensing PDF | HTML 27 ene 2023
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 ene 2022
Application note Digital Interfaces for Current Sensing Devices (Rev. A) PDF | HTML 30 sep 2021
Application brief Integrating the Current Sensing Signal Path (Rev. B) PDF | HTML 29 sep 2021
Application brief Integrated, Current Sensing Analog-to-Digital Converter (Rev. A) PDF | HTML 28 sep 2021
Application note Getting Started with Digital Power Monitors (Rev. A) PDF | HTML 02 sep 2021
Certificate INA238EVM EU RoHS Declaration of Conformity (DoC) (Rev. A) 16 dic 2020
Application note Understanding the I2C Bus PDF | HTML 30 jun 2015

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

INA228_237_238EVM — Módulo de evaluación INA228, INA237 y INA238

Este módulo de evaluación (EVM) es una plataforma fácil de usar para evaluar las funciones principales y el rendimiento de INA228, INA237 o INA238.

La EVM es compatible con mediciones de corriente de hasta 10 A e incorpora una interfaz gráfica de usuario (GUI) para leer y escribir en los registros (...)

Guía del usuario: PDF | HTML
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IDE, configuración, compilador o depurador

ASC-STUDIO-INA238 — ASC studio (SysConfig) for configuring all aspects of the INA238 current sensor

SysConfig can be used to help simplify configuration challenges and accelerate software development with the INA238 current sensor.
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CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
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SBOR021 — Power Monitor Tool

Power Monitor Tool
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VSSOP (DGS) 10 Ultra Librarian
Se aplican los Términos y condiciones estándar de TI para los elementos de evaluación.

Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL)/reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

Soporte y capacitación

Foros de TI E2E™ con asistencia técnica de los ingenieros de TI

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