Datasheet > INA238-Q1

INA238-Q1

更新时间： 2024-11-14 02:52:31

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
49页	2718K
描述
INA238 85-V, 16-Bit, High-Precision Power Monitor With I2C Interface

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INA238-Q1 数据手册

INA238

www.ti.com

SLYS025 – JANUARY 2021

INA238 85-V, 16-Bit, High-Precision Power Monitor With I²C Interface

1 Features

3 Description

•

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

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 ±163.84 mV

or ±40.96 mV across a resistive shunt sense element

with common-mode voltage support from –0.3 V to

+85 V.

The 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.

•

Wide common-mode range: –0.3 V to +85 V

Bus voltage sense input: 0 V to 85 V

Shunt full-scale differential range:

The low offset and gain drift design of the INA238

allows it to be used in precise systems that do not

±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)

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.

2 Applications

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.

•

DC-DC converters and power inverters

Industrial battery packs

Power-over-Ethernet (PoE)

Telecom equipment

Device Information ⁽¹⁾

Enterprise servers

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA238

VSSOP (10)

3.00 mm × 3.00 mm

(1) For all available packages, see the package option

addendum at the end of the data sheet.

Power

Reference

IN+

IN-

SCL

Voltage Current

Power

Temp

SDA

16 Bit

ADC

I²C

MUX

VBUS

Oscillator

Out-of-range

Threshold

ALERT

GND

Simplified Block Diagram

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Product Folder Links: INA238

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与INA238-Q1相关器件

型号	品牌	获取价格	描述	数据表
INA238-Q1_V01	TI	获取价格	INA238-Q1 AEC-Q100, 85-V, 16-Bit, High-Precision Power Monitor With I2C Interface
INA239	TI	获取价格	INA239-Q1 AEC-Q100, 85-V, 16-Bit, High-Precision Power Monitor With SPI Interface
INA239AIDGSR	TI	获取价格	INA239 85-V, 16-Bit, High-Precision Power Monitor With SPI Interface
INA239AIDGST	TI	获取价格	INA239 85-V, 16-Bit, High-Precision Power Monitor With SPI Interface
INA239AQDGSRQ1	TI	获取价格	INA239-Q1 AEC-Q100, 85-V, 16-Bit, High-Precision Power Monitor With SPI Interface
INA239-Q1	TI	获取价格	INA239-Q1 AEC-Q100, 85-V, 16-Bit, High-Precision Power Monitor With SPI Interface
INA239-Q1_V01	TI	获取价格	INA239-Q1 AEC-Q100, 85-V, 16-Bit, High-Precision Power Monitor With SPI Interface
INA240	TI	获取价格	具有增强的 PWM 抑制能力的 -4V 至 80V、双向、超精密电流感应放大器
INA240A1D	TI	获取价格	具有增强的 PWM 抑制能力的 -4V 至 80V、双向、超精密电流感应放大器 \| D \|
INA240A1DR	TI	获取价格	具有增强的 PWM 抑制能力的 -4V 至 80V、双向、超精密电流感应放大器 \| D \|

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