Product details

Common mode voltage (Max) (V) 85 Common mode voltage (Min) (V) -0.3 Input offset (+/-) (Max) (uV) 1 Input offset drift (+/-) (Typ) (uV/C) 0.002 Gain (V/V) 1 Gain error (%) 0.05 Gain error drift (+/-) (Max) (ppm/°C) 20 CMRR (Min) (dB) 154 Bandwidth (kHz) 10 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 1.1 Digital interface SPI Features Alert Function, Bi-directional, Digital Temp Monitor, Integrated Power Accumulator, Integrated Power Monitor, Low-side Capable, SPI, Ultra precise Resolution (Bits) 20 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (C) -40 to 125
Common mode voltage (Max) (V) 85 Common mode voltage (Min) (V) -0.3 Input offset (+/-) (Max) (uV) 1 Input offset drift (+/-) (Typ) (uV/C) 0.002 Gain (V/V) 1 Gain error (%) 0.05 Gain error drift (+/-) (Max) (ppm/°C) 20 CMRR (Min) (dB) 154 Bandwidth (kHz) 10 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 1.1 Digital interface SPI Features Alert Function, Bi-directional, Digital Temp Monitor, Integrated Power Accumulator, Integrated Power Monitor, Low-side Capable, SPI, Ultra precise Resolution (Bits) 20 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (C) -40 to 125
VSSOP (DGS) 10 9 mm² 3 x 3
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • High-resolution, 20-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset voltage: ±1 µV (maximum)
    • Offset drift: ±0.01 µV/°C (maximum)
    • Gain error: ±0.05% (maximum)
    • Gain error drift: ±20 ppm/°C (maximum)
    • Common mode rejection: 154 dB (minimum)
  • Power monitoring accuracy:
    • 0.5% full scale, –40°C to +125°C (maximum)
  • Energy and charge accuracy:
    • 1.0% full scale (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 resistor temperature compensation
  • 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)
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • High-resolution, 20-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset voltage: ±1 µV (maximum)
    • Offset drift: ±0.01 µV/°C (maximum)
    • Gain error: ±0.05% (maximum)
    • Gain error drift: ±20 ppm/°C (maximum)
    • Common mode rejection: 154 dB (minimum)
  • Power monitoring accuracy:
    • 0.5% full scale, –40°C to +125°C (maximum)
  • Energy and charge accuracy:
    • 1.0% full scale (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 resistor temperature compensation
  • 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 INA229-Q1 is an ultra-precise digital power monitor with a 20-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 INA229-Q1 reports current, bus voltage, temperature, power, energy and charge accumulation while employing a precision ±0.5% integrated oscillator, 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 INA229-Q1 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 mA 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 INA229-Q1 is an ultra-precise digital power monitor with a 20-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 INA229-Q1 reports current, bus voltage, temperature, power, energy and charge accumulation while employing a precision ±0.5% integrated oscillator, 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 INA229-Q1 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 mA 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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Pin-for-pin with same functionality to the compared device.
INA239-Q1 ACTIVE AEC-Q100, 85-V, 16-bit, high-precision, SPI output current/voltage/power monitor The INA239 has reduced accuracy and functionality at a lower price
Same functionality with different pin-out to the compared device.
INA228-Q1 ACTIVE AEC-Q100, 85-V, 20-bit, ultraprecise, I²C output current/voltage/power/energy/charge monitor The INA228 has the same functionality and performance but with an I2C interface

Technical documentation

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* Data sheet INA229-Q1 AEC-Q100, 85-V, 20-Bit, Ultra-Precise Power/Energy/Charge Monitor With SPI Interface datasheet (Rev. A) PDF | HTML 29 Jun 2021
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 note Integrating the Current Sensing Signal Path (Rev. B) PDF | HTML 29 Sep 2021
Application note 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
Technical article Solving the multidecade current-measurement challenge in your 48-V BMS application 14 Jun 2021
Technical article How current-sense amplifiers monitor satellite health 08 Feb 2021
Application note Shunt-Based Current-Sensing Solutions for BMS Applications in HEVs and EVs (Rev. B) PDF | HTML 02 Feb 2021
Functional safety information INA2x9-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA 17 Jul 2020
Technical article A key to accurate system thermal management: monitoring both current flow and temperature 04 Oct 2018
Technical article Understanding current sensing in HEV/EV batteries 02 Aug 2017
Application note Energy and Power Monitoring with Digital Current Sensors 25 May 2017

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