INA237

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Monitor de corriente, tensión y potencia de salida I2C de 85 V y 16 bits con alerta

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Hoja de datos

document-pdfAcrobat INA237 85-V, 16-Bit, Precision Power Monitor With I2C Interface datasheet (Rev. A) (Inglés) PDF | HTML

INA237

ACTIVO

Hoja de datos

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Detalles del producto

Common-mode voltage (max) (V)

85

Common-mode voltage (min) (V)

-0.3

Digital interface

I2C, SMBus

Resolution (Bits)

16

Input offset (±) (max) (µV)

50

Input offset drift (±) (max) (µV/°C)

0.02

Input offset drift (±) (typ) (µV/°C)

0.002

Voltage gain (V/V)

1

CMRR (min) (dB)

120

Iq (max) (mA)

1.1

Gain error (%)

0.3

Gain error drift (±) (max) (ppm/°C)

50

Features

Alert Function, Bidirectional, Digital Temp Monitor, I2C, Integrated Power Monitor, Low-side Capable

Number of channels

1

Power measurement accuracy (%)

0.6

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, SMBus

Resolution (Bits)

16

Input offset (±) (max) (µV)

50

Input offset drift (±) (max) (µV/°C)

0.02

Input offset drift (±) (typ) (µV/°C)

0.002

Voltage gain (V/V)

1

CMRR (min) (dB)

120

Iq (max) (mA)

1.1

Gain error (%)

0.3

Gain error drift (±) (max) (ppm/°C)

50

Features

Alert Function, Bidirectional, Digital Temp Monitor, I2C, Integrated Power Monitor, Low-side Capable

Number of channels

1

Power measurement accuracy (%)

0.6

Rating

Catalog

Operating temperature range (°C)

-40 to 125

VSSOP (DGS)

10

14.7 mm² (3 mm × 4.9 mm)

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)

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)

The INA237 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 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 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.

The INA237 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 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 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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INA238

ACTIVO

Monitor de corriente/tensión/potencia de salida I2C de 85 V, 16 bits y alta precisión con alerta< Pin-to-pin with increased 16-bit performance

Documentación técnica

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Documentación principal	Tipo	Título	Opciones de formato	Fecha
*	Hoja de datos	INA237 85-V, 16-Bit, Precision Power Monitor With I2C Interface datasheet (Rev. A)	PDF \| HTML	11/05/2022
	Nota sobre la aplicación	Using a PCB Copper Trace as a Current Sense Shunt Resistor (Rev. A)	PDF \| HTML	27/04/2026
	Nota sobre la aplicación	Closed Loop Constant Power Drive to Simplify Heater Element Control and Extend Battery Life	PDF \| HTML	29/01/2025
	Nota sobre la aplicación	Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers	PDF \| HTML	18/11/2024
	Application brief	Improving Power Amplifier Efficiency With Current Monitors (Rev. B)	PDF \| HTML	24/07/2023
	Nota sobre la aplicación	Digital Interfaces for Current Sensing Devices (Rev. A)	PDF \| HTML	30/09/2021
	Application brief	Integrating the Current Sensing Signal Path (Rev. B)	PDF \| HTML	29/09/2021
	Application brief	Integrated, Current Sensing Analog-to-Digital Converter (Rev. A)	PDF \| HTML	28/09/2021
	Nota sobre la aplicación	Getting Started with Digital Power Monitors (Rev. A)	PDF \| HTML	2/09/2021
	Certificado	INA237EVM EU RoHS Declaration of Conformity (DoC) (Rev. A)		16/12/2020
	Nota sobre la aplicación	Understanding the I2C Bus	PDF \| HTML	30/06/2015

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