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數位電源監測器

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

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產品規格表

INA237

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, 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 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 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 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 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 x 4.9
  • 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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重要文件 類型 標題 格式選項 日期
* Data sheet INA237 85-V, 16-Bit, Precision Power Monitor With I2C Interface datasheet (Rev. A) PDF | HTML 2022年 5月 11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 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 INA237EVM 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
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IDE、配置、編譯器或偵錯程式

ASC-STUDIO-INA237 — ASC studio (SysConfig) for configuring all aspects of the INA237 current sensor

SysConfig can be used to help simplify configuration challenges and accelerate software development with the INA237 current sensor.
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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 (...)

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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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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。 

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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 (...)
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參考設計

PMP23366 — 具有平順轉換和遙測功能的雙輸入備援 PoE Class 6 PD 參考設計

此設計實作乙太網路供電 (PoE) 第 6 類供電產品 (PD)，搭載雙備援 PoE 輸入，可在這些輸入與輔助輸入間順暢轉換。使用兩個 TPS2372-3 PD 控制器進行高達 51W 的高功率 PoE 控制。5V 9A 主動箝位順向式轉換器隨 TPS23734 IC 的 PWM 部分實作。INA237A 透過 I2C 提供輸入電壓/電流/功率/溫度量測。
Test report: PDF
參考設計

PMP23365 — 具備外部熱插拔及遙測功能的 24V、3A 8 類 PoE PD 參考設計

此參考設計利用 24V 與 3A 輸出實作乙太網路供電 (PoE) 電源裝置 (PD) 主動箝位順向式轉換器。配備整合式脈衝寬度調變器 (PWM) 控制器的 TPS23730 PD 可提供所有必要功能，以實現主動箝位順向式轉換器的 PoE PD 與 PWM 控制。此設計使用二次側調節 (SSR) 和光耦合器回饋。增加外部熱插拔以實現 7 類與 8 類 PD 應用。一次側使用 INA237 來監控 DC/DC 輸入電壓和電流，電源資訊則會由 I2C 隔離器或光耦合器架構電路傳送至二次側。
Test report: PDF
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