Overview
The INA228AQDGSRQ1 from Texas Instruments is an ultra-precise digital power monitor designed specifically for current-sensing applications. This device features a 20-bit delta-sigma ADC and is AEC-Q100 qualified, making it suitable for automotive and other high-reliability applications. It operates over a wide temperature range of –40°C to +125°C and supports a common-mode voltage range from –0.3 V to +85 V. The INA228AQDGSRQ1 measures current, bus voltage, temperature, power, energy, and charge accumulation, and it includes an integrated temperature sensor with ±1°C accuracy at 25°C.
Key Specifications
| Parameter | Value |
|---|---|
| Package | VSSOP (DGS), 10 pins |
| Operating Temperature Range | –40°C to +125°C |
| Supply Voltage | 2.7 V to 5.5 V |
| Operational Current | 640 µA (typical) |
| Shutdown Current | 5 µA (maximum) |
| 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 |
| 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) |
| I²C Interface Speed | 2.94 MHz |
Key Features
- AEC-Q100 qualified for automotive applications with a temperature grade 1: –40°C to +125°C.
- Functional Safety-Capable.
- High-resolution, 20-bit delta-sigma ADC.
- High accuracy in current monitoring with low offset voltage (±1 µV), low offset drift (±0.01 µV/°C), and low gain error (±0.05%).
- Wide common-mode range: –0.3 V to +85 V.
- Bus voltage sense input: 0 V to 85 V.
- Programmable resistor temperature compensation and programmable conversion time and averaging.
- Fast alert response time of 75 µs.
- Low input bias current of 2.5 nA (maximum) allowing for larger current-sense resistors.
- Selectable ADC conversion times from 50 µs to 4.12 ms and sample averaging from 1x to 1024x.
Applications
The INA228AQDGSRQ1 is designed for various high-precision current-sensing applications, including:
- Automotive systems: Due to its AEC-Q100 qualification, it is suitable for use in automotive power management and monitoring systems.
- Industrial power monitoring: Ideal for monitoring current, voltage, power, energy, and charge in industrial equipment.
- Renewable energy systems: Can be used in solar and wind power systems to monitor and manage energy output.
- Server and data center power management: Helps in monitoring and optimizing power consumption in data centers.
- Medical devices: Suitable for precise power monitoring in medical equipment.
Q & A
- What is the operating temperature range of the INA228AQDGSRQ1?
The INA228AQDGSRQ1 operates over a temperature range of –40°C to +125°C. - What is the resolution of the ADC in the INA228AQDGSRQ1?
The device features a 20-bit delta-sigma ADC. - What is the common-mode voltage range supported by the INA228AQDGSRQ1?
The device supports a common-mode voltage range from –0.3 V to +85 V. - What is the accuracy of the integrated temperature sensor?
The integrated temperature sensor has an accuracy of ±1°C at 25°C. - What is the typical operational current of the INA228AQDGSRQ1?
The typical operational current is 640 µA. - What is the maximum shutdown current of the INA228AQDGSRQ1?
The maximum shutdown current is 5 µA. - What is the range of the shunt full-scale differential input?
The shunt full-scale differential range is ±163.84 mV or ±40.96 mV. - What is the input bias current of the INA228AQDGSRQ1?
The input bias current is 2.5 nA (maximum). - Does the INA228AQDGSRQ1 support programmable conversion times and averaging?
Yes, it supports programmable conversion times from 50 µs to 4.12 ms and sample averaging from 1x to 1024x. - What is the speed of the I²C interface?
The I²C interface operates at 2.94 MHz.
