Overview
The INA229-Q1, produced by Texas Instruments, is an ultra-precise digital power monitor designed specifically for current-sensing applications. It features a high-resolution 20-bit delta-sigma ADC and is AEC-Q100 qualified for automotive applications, ensuring reliability over a temperature range of –40°C to +125°C. The device is capable of measuring current, bus voltage, temperature, power, energy, and charge accumulation with high accuracy and precision. It also includes an integrated temperature sensor and supports a wide common-mode range, making it suitable for a variety of precise systems without the need for multi-temperature calibration during manufacturing.
Key Specifications
| Specification | Value |
|---|---|
| ADC 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) |
| Power Monitoring Accuracy | 0.5% full scale, –40°C to +125°C (maximum) |
| Energy and Charge Accuracy | 1.0% full scale (maximum) |
| Common Mode Rejection | 154 dB (minimum) |
| 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 Accuracy | ±1°C (maximum at 25°C) |
| Supply Voltage | 2.7-V to 5.5-V |
| Operational Current | 640 µA (typical) |
| Shutdown Current | 5 µA (maximum) |
| Communication Interface | 10-MHz SPI |
| ADC Conversion Time | 50 µs to 4.12 ms |
| Sample Averaging | 1x to 1024x |
Key Features
- AEC-Q100 qualified for automotive applications with a temperature range of –40°C to +125°C.
- Functional Safety-Capable.
- High-resolution 20-bit delta-sigma ADC for precise current, voltage, power, energy, and charge measurements.
- Low offset voltage and gain drift, allowing for use in precise systems without multi-temperature calibration.
- Wide common-mode range: –0.3 V to +85 V.
- Bus voltage sense input: 0 V to 85 V.
- Programmable resistor temperature compensation and ADC conversion time.
- 10-MHz SPI communication interface.
- Operates from a 2.7-V to 5.5-V supply with low operational and shutdown currents.
Applications
The INA229-Q1 is designed for various current-sensing applications, particularly in the automotive sector due to its AEC-Q100 qualification. It is suitable for use in systems requiring high precision and reliability, such as:
- Automotive power systems.
- Industrial power monitoring.
- High-precision current sensing in mA to kA range.
- Energy and charge monitoring in battery management systems.
- Temperature monitoring in ambient and system environments.
Q & A
- What is the primary function of the INA229-Q1?
The INA229-Q1 is an ultra-precise digital power monitor designed for current-sensing applications, measuring current, bus voltage, temperature, power, energy, and charge accumulation. - What is the ADC resolution of the INA229-Q1?
The INA229-Q1 features a 20-bit delta-sigma ADC. - What is the temperature range for the INA229-Q1?
The device operates over a temperature range of –40°C to +125°C. - What is the common mode rejection ratio of the INA229-Q1?
The common mode rejection ratio is 154 dB (minimum). - What is the supply voltage range for the INA229-Q1?
The device operates from a 2.7-V to 5.5-V supply. - What communication interface does the INA229-Q1 use?
The INA229-Q1 uses a 10-MHz SPI communication interface. - What is the accuracy of the integrated temperature sensor?
The integrated temperature sensor is ±1°C accurate at 25°C. - Can the INA229-Q1 be used in precise systems without multi-temperature calibration?
Yes, the low offset and gain drift design of the INA229-Q1 allows it to be used in precise systems without multi-temperature calibration. - What is the range for the shunt full-scale differential input?
The shunt full-scale differential range is ±163.84 mV or ±40.96 mV. - What is the typical operational current of the INA229-Q1?
The typical operational current is 640 µA.
