Overview
The INA228AIDGSR, produced by Texas Instruments, is an ultra-precise digital power monitor designed specifically for current-sensing applications. It features a 20-bit delta-sigma ADC and is capable of measuring a full-scale differential input of ±163.84 mV or ±40.96 mV across a resistive shunt sense element. The device supports a common-mode voltage range from –0.3 V to +85 V, making it suitable for high-voltage systems. The INA228 reports current, bus voltage, temperature, power, energy, and charge accumulation, utilizing a precision ±0.5% integrated oscillator for accurate calculations.
The device is notable for its low offset and gain drift, allowing it to be used in precise systems without the need for multi-temperature calibration during manufacturing. It also includes an integrated temperature sensor with ±1°C accuracy for die temperature measurement and system ambient temperature monitoring.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 20-bit | |
| Differential Input Range | ±163.84 mV or ±40.96 mV | |
| Common-Mode Voltage Range | –0.3 V to +85 V | |
| Supply Voltage | 2.7 V to 5.5 V | |
| Operational Current | 640 µA (typical) | |
| Shutdown Current | 5 µA (maximum) | |
| I2C Interface | 2.94-MHz high-speed I2C with 16 pin-selectable addresses | |
| ADC Conversion Time | 50 µs to 4.12 ms | |
| Sample Averaging | 1x to 1024x | |
| Temperature Accuracy | ±1°C (die temperature measurement) | |
| Package | VSSOP (10 pins), 3.00 mm × 3.00 mm |
Key Features
- High-Resolution ADC: 20-bit delta-sigma ADC for precise current, voltage, power, energy, and charge measurements.
- Programmable Conversion Time and Averaging: Selectable ADC conversion times from 50 µs to 4.12 ms and sample averaging from 1x to 1024x to reduce noise.
- High-Speed I2C Interface: 2.94-MHz I2C interface with 16 pin-selectable addresses for flexible communication.
- Low Offset and Gain Drift: Designed for precise systems without the need for multi-temperature calibration, with very low offset voltage and noise.
- Integrated Temperature Sensor: ±1°C accurate for die temperature measurement and system ambient temperature monitoring.
- Low Input Bias Current: Allows the use of larger current-sense resistors for accurate measurements in the micro-amp range.
- High Voltage Measurement Capability: Operates off a 2.7 V to 5.5 V supply but can measure voltage and current on rails as high as 85 V.
Applications
- DC/DC Converters and Power Inverters: For precise monitoring of current, voltage, and power in power conversion systems.
- Industrial Battery Packs: To monitor charge, discharge, and overall health of battery packs.
- Power-over-Ethernet (PoE): For managing power delivery over Ethernet cables.
- Telecom Equipment: To ensure reliable and efficient power management in telecommunications systems.
- Enterprise Servers: For monitoring and managing power consumption in data center environments.
Q & A
- What is the resolution of the INA228AIDGSR's ADC?
The INA228AIDGSR features a 20-bit delta-sigma ADC.
- What is the differential input range of the INA228AIDGSR?
The differential input range is ±163.84 mV or ±40.96 mV.
- What is the common-mode voltage range supported by the INA228AIDGSR?
The common-mode voltage range is from –0.3 V to +85 V.
- What is the supply voltage range for the INA228AIDGSR?
The supply voltage range is from 2.7 V to 5.5 V.
- What is the typical operational current of the INA228AIDGSR?
The typical operational current is 640 µA.
- What is the maximum shutdown current of the INA228AIDGSR?
The maximum shutdown current is 5 µA.
- What is the speed of the I2C interface on the INA228AIDGSR?
The I2C interface operates at 2.94 MHz.
- What is the range of ADC conversion times available on the INA228AIDGSR?
The ADC conversion time can be set from 50 µs to 4.12 ms.
- What is the range of sample averaging available on the INA228AIDGSR?
The sample averaging can be set from 1x to 1024x.
- What is the accuracy of the integrated temperature sensor in the INA228AIDGSR?
The integrated temperature sensor has an accuracy of ±1°C.
