Overview
The INA229AIDGST is an ultra-precise digital power monitor produced by Texas Instruments. It is specifically designed for current-sensing applications and features a high-resolution 20-bit delta-sigma ADC. This device is capable of measuring a full-scale differential input of ±163.84 mV or ±40.96 mV across a resistive shunt sense element, with common-mode voltage support from –0.3 V to +85 V. The INA229 reports current, bus voltage, temperature, power, energy, and charge accumulation, utilizing a precision ±0.5% integrated oscillator to perform the necessary calculations in the background.
Key Specifications
| Parameter | Specification |
|---|---|
| ADC Resolution | 20-bit delta-sigma ADC |
| Full-scale Differential Input | ±163.84 mV / ±40.96 mV |
| Common-mode Range | –0.3 V to +85 V |
| Bus Voltage Sense Input | 0 V to 85 V |
| 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 |
| Input Bias Current | 2.5 nA (maximum) |
| Temperature Sensor Accuracy | ±1°C (maximum at 25°C) |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Operational Current | 640 µA (typical) |
| Shutdown Current | 5 µA (maximum) |
| Communication Interface | 10-MHz SPI |
| Operating Temperature Range | –40°C to 125°C |
| Package Type | VSSOP (DGS), 10 pins |
Key Features
- High-resolution, 20-bit delta-sigma ADC for precise current sensing.
- Low offset voltage (±1 µV maximum) and low offset drift (±0.01 µV/°C maximum) for accurate measurements.
- Low gain error (±0.05% maximum) and low gain error drift (±20 ppm/°C maximum).
- High common mode rejection ratio (154 dB minimum).
- Fast alert response time of 75 µs.
- Wide common-mode range from –0.3 V to +85 V.
- Bus voltage sense input range from 0 V to 85 V.
- Integrated temperature sensor with ±1°C accuracy at 25°C.
- Programmable resistor temperature compensation and programmable conversion time and averaging.
- 10-MHz SPI communication interface.
- Operates from a 2.7-V to 5.5-V supply with low operational current (640 µA typical) and shutdown current (5 µA maximum).
Applications
The INA229AIDGST is suitable for a variety of current-sensing applications, including:
- High-precision current monitoring in industrial and automotive systems.
- Energy and charge accumulation measurements in battery management systems.
- Power monitoring in data centers and server systems.
- Current sensing in renewable energy systems, such as solar and wind power.
- Advanced robotics and motor control systems requiring precise current measurements.
Q & A
- What is the resolution of the ADC in the INA229AIDGST?
The INA229AIDGST features a high-resolution 20-bit delta-sigma ADC.
- What is the common-mode range of the INA229AIDGST?
The common-mode range is from –0.3 V to +85 V.
- What is the accuracy of the integrated temperature sensor?
The integrated temperature sensor is accurate to ±1°C at 25°C.
- What is the power monitoring accuracy of the INA229AIDGST?
The power monitoring accuracy is 0.5% full scale from –40°C to +125°C.
- What is the input bias current of the INA229AIDGST?
The input bias current is 2.5 nA (maximum).
- What communication interface does the INA229AIDGST use?
The device uses a 10-MHz SPI communication interface.
- What is the operational current of the INA229AIDGST?
The operational current is 640 µA (typical).
- What is the shutdown current of the INA229AIDGST?
The shutdown current is 5 µA (maximum).
- What is the supply voltage range for the INA229AIDGST?
The supply voltage range is from 2.7 V to 5.5 V.
- What are the programmable features of the INA229AIDGST?
The device allows for programmable resistor temperature compensation and programmable conversion time and averaging.
- What is the fast alert response time of the INA229AIDGST?
The fast alert response time is 75 µs.
