首頁 放大器 電流感測放大器 數位電源監測器
首頁
放大器
電流感測放大器
數位電源監測器

INA238

現行

具有警報功能的 85-V、16 位元、高精密度 I2C 輸出電流/電壓/電源監測器

立即訂購
產品規格表

INA238

現行
產品規格表 立即訂購

產品詳細資料

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.
filter 尋找其它 數位電源監測器
下載 觀看有字幕稿的影片 影片

您可能會感興趣的類似產品

open-in-new 比較替代產品
可直接投入的替代產品，相較於所比較的裝置，具備升級功能
INA228 現行 具備警報功能的 85V、20 位元 I²C 輸出 E3 驅動器功能電流、電壓、電源、能源、充電監視器 Pin-to-pin with increased 20-bit performance
引腳對引腳且具備與所比較裝置相同的功能
INA237 現行 具有警報功能的 85-V、16 位元、I2C 輸出電流/電壓/電源監測器 Pin-to-pin with reduced 16-bit performance.
功能相同，但引腳輸出與所比較的裝置不同
INA239 現行 具有警報功能的 85-V、16 位元、高精密度、SPI 輸出電流/電壓/電源監測器 Similar 16-bit performance with SPI interface.

技術文件

star =TI 所選的此產品重要文件
找不到結果。請清除您的搜尋條件，然後再試一次。
檢視所有 12
重要文件 類型 標題 格式選項 日期
* Data sheet INA238 85V, 16 -Bit, High-Precision Power Monitor With I2C Interface datasheet (Rev. B) PDF | HTML 2025年 5月 29日
Application note Closed Loop Constant Power Drive to Simplify Heater Element Control and Extend Battery Life PDF | HTML 2025年 1月 29日
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 2024年 11月 18日
Application brief Improving Power Amplifier Efficiency With Current Monitors (Rev. B) PDF | HTML 2023年 7月 24日
Application brief How to optimize PoE systems using discrete current sensing PDF | HTML 2023年 1月 27日
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 2022年 1月 25日
Application note Digital Interfaces for Current Sensing Devices (Rev. A) PDF | HTML 2021年 9月 30日
Application brief Integrating the Current Sensing Signal Path (Rev. B) PDF | HTML 2021年 9月 29日
Application brief Integrated, Current Sensing Analog-to-Digital Converter (Rev. A) PDF | HTML 2021年 9月 28日
Application note Getting Started with Digital Power Monitors (Rev. A) PDF | HTML 2021年 9月 2日
Certificate INA238EVM EU RoHS Declaration of Conformity (DoC) (Rev. A) 2020年 12月 16日
Application note Understanding the I2C Bus PDF | HTML 2015年 6月 30日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

INA228_237_238EVM — INA228、INA237 和 INA238 評估模組

此評估模組 (EVM) 是一款易於使用的平台，可評估 INA228、INA237 或 INA238 的主要功能與性能。

EVM 支援高達 10-A 的電流量測，並隨附圖形使用者介面 (GUI) 支援，可讀取及寫入裝置暫存器。

使用指南: PDF | HTML
View Options
IDE、配置、編譯器或偵錯程式

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.
支援產品和硬體

支援產品和硬體
啟動
計算工具

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

支援產品和硬體

支援產品和硬體
啟動 下載
計算工具

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 (...)
支援產品和硬體

支援產品和硬體
下載
計算工具

SBOR021 — Power Monitor Tool

Power Monitor Tool
支援產品和硬體

支援產品和硬體
下載
模擬工具

PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

PSpice® for TI 是有助於評估類比電路功能的設計和模擬環境。這款全功能設計和模擬套件使用 Cadence® 的類比分析引擎。PSpice for TI 包括業界最大的模型庫之一，涵蓋我們的類比和電源產品組合，以及特定類比行為模型，且使用無需支付費用。

PSpice for TI 設計和模擬環境可讓您使用其內建函式庫來模擬複雜的混合訊號設計。在進行佈局和製造之前，建立完整的終端設備設計和解決方案原型，進而縮短上市時間並降低開發成本。 

在 PSpice for TI 設計與模擬工具中，您可以搜尋 TI (...)
要求
模擬工具

TINA-TI — 基於 SPICE 的類比模擬程式

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 (...)
使用指南: PDF
View Options
封裝 針腳 CAD 符號、佔位空間與 3D 模型
VSSOP (DGS) 10 Ultra Librarian
適用 TI 的評估品項標準條款與條件。

訂購與品質

內含資訊：
  • RoHS
  • REACH
  • 產品標記
  • 鉛塗層/球物料
  • MSL 等級/回焊峰值
  • MTBF/FIT 估算值
  • 材料內容
  • 認證摘要
  • 進行中的可靠性監測
內含資訊：
  • 晶圓廠位置
  • 組裝地點

支援與培訓

內含 TI 工程師技術支援的 TI E2E™ 論壇

以英文檢視所有論壇主題

內容係由 TI 和社群貢獻者依「現狀」提供，且不構成 TI 規範。檢視使用條款。

若有關於品質、封裝或訂購 TI 產品的問題，請參閱 TI 支援。​​​​​​​​​​​​​​

影片