Texas Instruments INA229AQDGSRQ1

Overview

INA229AQDGSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) ultra-precise 20-bit delta-sigma power/energy/charge monitor IC for automotive current sensing. It delivers ±1 µV shunt offset voltage, ±0.05% power measurement accuracy over temperature, and 75 µs alert response - enabling high-fidelity battery monitoring in EV traction inverters and ADAS domain controllers.

For engineers reviewing the INA229AQDGSRQ1 datasheet, INA229AQDGSRQ1 pinout, INA229AQDGSRQ1 application, or INA229AQDGSRQ1 equivalent, key selection criteria include its –0.3 V to +85 V common-mode range, programmable ADC conversion time (50 µs to 4.12 ms), ±40.96 mV / ±163.84 mV dual-range shunt input, integrated ±1°C temperature sensor, and 10-MHz SPI interface with open-drain ALERT output.

Technical Context

The INA229AQDGSRQ1 integrates a single 20-bit delta-sigma ADC with internal multiplexer routing shunt voltage (IN+/IN–), bus voltage (VBUS), and die temperature to one conversion engine. Its low-offset, low-drift analog front end supports bidirectional current sensing across –0.3 V to +85 V common-mode while maintaining 154 dB CMRR and ±2.5 nA max input bias current.

Background calculation logic computes real-time current, power, energy, and charge using calibrated shunt and bus measurements - all synchronized via a precision ±1% internal oscillator. Conversion mode (continuous/triggered), averaging (1×–1024×), and delay (0–510 ms) are fully programmable via SPI registers without host CPU intervention.

Key Specifications

Pinout & Package

VSSOP-10 package (3.00 mm × 3.00 mm), thermally enhanced for automotive under-hood operation; RoHS-compliant, AEC-Q100 qualified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power monitoring applications.

Compared with INA226AIDGSR and INA233AIRGTR, the INA229AQDGSRQ1 uniquely combines AEC-Q100 Grade 1 qualification, 20-bit resolution, and 10-MHz SPI in a single VSSOP-10 package - delivering the highest measurement fidelity for ASIL-B–compliant automotive power monitoring where accuracy, speed, and safety assurance are co-dependent.

Availability

INA229AQDGSRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, EV/HEV traction inverters, ADAS domain controllers, and high-reliability DC/DC converters requiring stable component supply across extended temperature and long production lifecycles.

Supply support for INA229AQDGSRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader designing analog and embedded processing solutions for automotive, industrial, and personal electronics markets.

The INA229-Q1 product line targets ultra-precise, safety-aware power monitoring in next-generation electric vehicles - emphasizing AEC-Q100 reliability, background computation, and flexible SPI configurability for scalable BMS and powertrain architectures.

FAQ

What is the maximum common-mode voltage supported by the INA229AQDGSRQ1?

The INA229AQDGSRQ1 supports a common-mode input voltage range of –0.3 V to +85 V at the IN+ and IN– pins. This allows direct high-side or low-side current sensing on 48 V mild-hybrid, 400 V BEV, and 800 V fast-charging battery rails without external level-shifting circuitry. The specification is validated across the full AEC-Q100 Grade 1 temperature range (–40°C to +125°C).

Does the INA229AQDGSRQ1 require external calibration for automotive temperature operation?

No, the INA229AQDGSRQ1 does not require multi-temperature calibration in production due to its ultra-low ±0.01 µV/°C offset drift and ±20 ppm/°C gain drift. Its ±1 µV maximum offset voltage and precision internal oscillator enable stable ±0.5% power measurement accuracy from –40°C to +125°C - meeting stringent automotive BMS accuracy requirements out-of-box.

How does the INA229AQDGSRQ1 handle energy and charge accumulation?

The INA229AQDGSRQ1 performs continuous background accumulation of energy and charge in dedicated 32-bit registers using time-aligned current and power samples. Accumulation occurs only in continuous-conversion mode; triggered mode invalidates accumulation due to undefined inter-sample timing. Full-scale accuracy is ±1.0%, and values persist until read or reset via SPI command.

Can the INA229AQDGSRQ1 measure both shunt and bus voltage simultaneously?

The INA229AQDGSRQ1 uses a single 20-bit delta-sigma ADC with internal multiplexer to sequentially sample shunt voltage (IN+/IN–), bus voltage (VBUS), and temperature. While not truly simultaneous, programmable conversion timing (50 µs to 4.12 ms) and independent averaging allow tightly synchronized measurements - critical for accurate power calculation (P = I × V) in dynamic automotive loads.

What is the purpose of the ALERT pin on the INA229AQDGSRQ1?

The ALERT pin on the INA229AQDGSRQ1 is an open-drain digital output that asserts low autonomously when user-configured thresholds are exceeded - including shunt overvoltage, bus undervoltage/overvoltage, temperature limit, or calculation overflow. With 75 µs response time and no host intervention required, it enables hard real-time fault handling in ASIL-B systems such as contactor disconnect or inverter shutdown.