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INA239

ACTIVE

85-V, 16-bit, high-precision, SPI output current/voltage/power monitor with alert

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Data sheet

INA239

ACTIVE
Data sheet Order now

Product details

Common-mode voltage (max) (V) 85 Common-mode voltage (min) (V) -0.3 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 Digital interface SPI Gain error (%) 0.1 Gain error drift (±) (max) (ppm/°C) 25 Features Alert Function, Bidirectional, Digital Temp Monitor, High precision, Integrated Power Monitor, Low-side Capable, SPI Number of channels 1 Resolution (Bits) 16 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 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 Digital interface SPI Gain error (%) 0.1 Gain error drift (±) (max) (ppm/°C) 25 Features Alert Function, Bidirectional, Digital Temp Monitor, High precision, Integrated Power Monitor, Low-side Capable, SPI Number of channels 1 Resolution (Bits) 16 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: ±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
  • 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
  • 10-MHz SPI communication interface
  • 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: ±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
  • 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
  • 10-MHz SPI communication interface
  • Operates from a 2.7-V to 5.5-V supply:
    • Operational current: 640 µA (typical)
    • Shutdown current: 5 µA (maximum)

The INA239 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 INA239 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 INA239 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 INA239 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 INA239 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 INA239 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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Technical documentation

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Type Title Date
* Data sheet INA239 85-V, 16-Bit, High-Precision Power Monitor With SPI Interface datasheet (Rev. A) PDF | HTML 11 May 2022
EVM User's guide INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide (Rev. E) PDF | HTML 17 Aug 2022
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 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 INA239EVM EU RoHS Declaration of Conformity (DoC) (Rev. A) 16 Dec 2020

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