Overview
The INA239-Q1, produced by Texas Instruments, is an ultra-precise digital power monitor designed specifically for current-sensing applications. This device features a 16-bit delta-sigma ADC and is compliant with the AEC-Q100 standard, ensuring high reliability in automotive and other demanding environments. The INA239-Q1 can measure 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. It reports current, bus voltage, temperature, and power, performing the necessary calculations in the background. The integrated temperature sensor provides ±1°C accuracy for die temperature measurement and is useful for monitoring system ambient temperature.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VS) | 2.7 | 5.5 | V | |
| Common-mode Input Range (VCM) | –0.3 | 85 | V | |
| Bus Voltage Input Range (VVBUS) | 0 | 85 | V | |
| Shunt Voltage Input Range (VDIFF) | –163.84 | 163.84 | mV (ADCRANGE = 0) | |
| Shunt Voltage Input Range (VDIFF) | –40.96 | 40.96 | mV (ADCRANGE = 1) | |
| Shunt Offset Voltage (Vos) | ±1.5 | ±5 | µV | |
| Temperature Measurement Range | –40 | 125 | °C | |
| Temperature Accuracy at 25°C | ±0.15 | ±1 | °C | |
| Quiescent Current (IQ) | 640 | 750 | µA | |
| Shutdown Current (IQSD) | 5 | µA | ||
| ADC Conversion Time | 50 µs | 4.12 ms | ||
| Sample Averaging | 1x | 1024x |
Key Features
- High-Precision Measurements: The INA239-Q1 features a 16-bit delta-sigma ADC, providing high accuracy in current, bus voltage, and temperature measurements.
- Wide Dynamic Range: The device supports a wide dynamic range without significant power dissipation losses on the sensing shunt element, making it suitable for A to kA sensing applications.
- Low Offset and Gain Drift: The low offset and gain drift design allows the device to be used in precise systems without the need for multi-temperature calibration during manufacturing.
- Low Input Bias Current: The low input bias current enables the use of larger current-sense resistors, providing accurate current measurements in the micro-amp range.
- Programmable ADC Conversion Times and Averaging: Selectable ADC conversion times from 50 µs to 4.12 ms and sample averaging from 1x to 1024x help reduce noise in measured data.
- Integrated Temperature Sensor: The device includes an integrated temperature sensor with ±1°C accuracy at 25°C, useful for monitoring system ambient temperature.
- SPI Communication Interface: A 10-MHz SPI communication interface facilitates data transfer and configuration.
Applications
- Automotive Battery Management Systems: Suitable for monitoring battery health and performance in automotive applications.
- EV/HEV Current Sensing: Ideal for current sensing in electric and hybrid electric vehicles.
- DC/DC Converters and Power Inverters: Used in power conversion and inversion applications requiring precise current and voltage monitoring.
- ADAS Domain Controllers: Applicable in Advanced Driver Assistance Systems (ADAS) for precise power and current monitoring.
Q & A
- What is the primary function of the INA239-Q1?
The INA239-Q1 is an ultra-precise digital power monitor designed for current-sensing applications, measuring current, bus voltage, temperature, and power.
- What is the common-mode voltage range supported by the INA239-Q1?
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 are the selectable ADC conversion times for the INA239-Q1?
The ADC conversion times can be set from 50 µs to 4.12 ms.
- What is the range for sample averaging in the INA239-Q1?
The sample averaging can be set from 1x to 1024x.
- What is the typical quiescent current of the INA239-Q1?
The typical quiescent current is 640 µA.
- What is the shutdown current of the INA239-Q1?
The shutdown current is a maximum of 5 µA.
- What communication interface does the INA239-Q1 use?
The device uses a 10-MHz SPI communication interface.
- What are some typical applications of the INA239-Q1?
Applications include automotive battery management systems, EV/HEV current sensing, DC/DC converters, power inverters, and ADAS domain controllers.
- Is the INA239-Q1 compliant with any automotive standards?
Yes, the INA239-Q1 is compliant with the AEC-Q100 standard.
