INA238

AKTIV

Hochpräzises I2C-Überwachungsmodul für Ausgangsstrom/Spannung/Leistung mit Warnfunktionen (85 V,

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Datenblatt

document-pdfAcrobat INA238 85V, 16 -Bit, High-Precision Power Monitor With I2C Interface datasheet (Rev. B) (Englisch) PDF | HTML

INA238

AKTIV

Datenblatt

Jetzt bestellen

Produktdetails

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

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

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 mm × 4.9 mm)

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.

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Technische Dokumentation

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Design und Entwicklung

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Evaluierungsplatine

INA228_237_238EVM — Evaluierungsmodul für INA228, INA237 und INA238

Dieses Evaluierungsmodul (EVM) ist eine benutzerfreundliche Plattform zum Evaluieren der Hauptfunktionen und der Leistung des INA228, INA237 oder INA238.

Das EVM unterstützt Strommessungen bis zu 10 A und verfügt über eine grafische Benutzeroberfläche (GUI) zum Lesen und Schreiben in (...)

Benutzerhandbuch: PDF | HTML