Overview
The INA229AIDGSR from Texas Instruments is an ultra-precise digital power monitor designed specifically for current-sensing applications. It features a 20-bit delta-sigma ADC, providing high-resolution measurements of current, bus voltage, temperature, power, energy, and charge accumulation. The device is optimized for use in precise systems, offering low offset and gain drift, which eliminates the need for multi-temperature calibration during manufacturing. It supports a wide common-mode range from –0.3 V to +85 V, making it suitable for both high-side and low-side current measurements.
Key Specifications
| Specification | Value |
|---|---|
| Package | VSSOP (DGS), 10 pins |
| Operating Temperature Range | –40°C to +125°C |
| Voltage Supply Range | 2.7 V to 5.5 V |
| ADC Resolution | 20-bit delta-sigma ADC |
| 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 |
| 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) |
| Operational Current | 640 µA (typical) |
| Shutdown Current | 5 µA (maximum) |
| SPI Communication Interface | 10 MHz |
Key Features
- High-resolution, 20-bit delta-sigma ADC for precise current measurements.
- Low offset voltage (±1 µV maximum) and low gain drift (±0.01 µV/°C maximum) for accurate measurements across temperature variations.
- Wide common-mode range from –0.3 V to +85 V, supporting both high-side and low-side current measurements.
- Bus voltage sense input from 0 V to 85 V.
- Fast alert response time of 75 µs.
- Programmable resistor temperature compensation and conversion time and averaging.
- Integrated temperature sensor with ±1°C accuracy at 25°C.
- Selectable ADC conversion times from 50 µs to 4.12 ms and sample averaging from 1x to 1024x.
- Operates from a 2.7-V to 5.5-V supply with low operational current (640 µA typical) and shutdown current (5 µA maximum).
- 10-MHz SPI communication interface for data transfer.
Applications
The INA229AIDGSR is suitable for a variety of applications requiring precise current, voltage, power, energy, and charge monitoring. These include:
- High-precision current sensing in industrial and automotive systems.
- Power monitoring in data centers and server systems.
- Energy and charge accumulation measurements in battery management systems.
- Temperature monitoring in various industrial and automotive environments.
- Applications requiring low offset and gain drift, such as in precision instrumentation and medical devices.
Q & A
- What is the primary function of the INA229AIDGSR?
The INA229AIDGSR 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 resolution of the ADC in the INA229AIDGSR?
The INA229AIDGSR features a 20-bit delta-sigma ADC.
- What is the operating temperature range of the INA229AIDGSR?
The device operates from –40°C to +125°C.
- What is the voltage supply range for the INA229AIDGSR?
The device operates from a 2.7-V to 5.5-V supply.
- What is the common-mode range supported by the INA229AIDGSR?
The device supports a common-mode range from –0.3 V to +85 V.
- How accurate is the temperature sensor in the INA229AIDGSR?
The integrated temperature sensor is ±1°C accurate at 25°C.
- What is the typical operational current of the INA229AIDGSR?
The typical operational current is 640 µA.
- What is the maximum shutdown current of the INA229AIDGSR?
The maximum shutdown current is 5 µA.
- What communication interface does the INA229AIDGSR use?
The device uses a 10-MHz SPI communication interface.
- Can the INA229AIDGSR measure energy and charge accumulation?
Yes, the device can measure energy and charge accumulation with an accuracy of 1.0% full scale.
- How does the INA229AIDGSR handle shunt resistor temperature compensation?
The device can compensate for shunt resistor temperature variance using its internal temperature sensor and programmable temperature compensation settings.
