Overview
The INA238AIDGSR from 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 capable of measuring current, bus voltage, temperature, and power. It supports a wide common-mode voltage range from –0.3 V to +85 V and can handle full-scale differential inputs of ±163.84 mV or ±40.96 mV across a resistive shunt sense element. The integrated temperature sensor provides ±1°C accuracy for die temperature measurement, which is also useful for monitoring system ambient temperature. The INA238AIDGSR is packaged in a 10-pin VSSOP (DGS) package and operates over a temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Value |
|---|---|
| Package | VSSOP (DGS), 10 pins |
| Operating Temperature Range | –40°C to 125°C |
| ADC Resolution | 16-bit delta-sigma ADC |
| Offset Voltage | ±5 µV (maximum) |
| Offset Drift | ±0.02 µV/°C (maximum) |
| Gain Error | ±0.1% (maximum) |
| Gain Error Drift | ±25 ppm/°C (maximum) |
| Common Mode Rejection | 140 dB (minimum) |
| Power Monitoring Accuracy | 0.7% full scale, –40°C to +125°C (maximum) |
| Alert Response Time | 75 µs |
| Common-Mode Voltage 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) |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Operational Current | 640 µA (typical) |
| Shutdown Current | 5 µA (maximum) |
| I2C Interface Speed | 2.94 MHz |
| I2C Addresses | 16 pin-selectable addresses |
Key Features
- High-resolution, 16-bit delta-sigma ADC for precise current, voltage, and power measurements.
- Low offset and gain drift, allowing for use in precise systems without multi-temperature calibration.
- Wide common-mode voltage range from –0.3 V to +85 V.
- Fast alert response time of 75 µs.
- Programmable ADC conversion times from 50 µs to 4.12 ms and sample averaging from 1x to 1024x.
- Integrated temperature sensor with ±1°C accuracy at 25°C.
- Low input bias current of 2.5 nA, enabling the use of larger current-sense resistors.
- Operates from a 2.7-V to 5.5-V supply with typical operational current of 640 µA and shutdown current of 5 µA.
- 2.94-MHz high-speed I2C interface with 16 pin-selectable addresses.
Applications
The INA238AIDGSR is suitable for a variety of applications that require precise current, voltage, and power monitoring. These include:
- Server and data center power management systems.
- Industrial control and automation systems.
- Automotive systems requiring high-precision power monitoring.
- Telecommunications and networking equipment.
- Renewable energy systems, such as solar and wind power monitoring.
Q & A
- What is the primary function of the INA238AIDGSR?
The INA238AIDGSR is a high-precision digital power monitor designed to measure current, voltage, temperature, and power in various applications. - What is the resolution of the ADC in the INA238AIDGSR?
The INA238AIDGSR features a 16-bit delta-sigma ADC. - What is the common-mode voltage range supported by the INA238AIDGSR?
The device supports a common-mode voltage range from –0.3 V to +85 V. - How accurate is the temperature sensor in the INA238AIDGSR?
The integrated temperature sensor is ±1°C accurate at 25°C. - What is the typical operational current of the INA238AIDGSR?
The typical operational current is 640 µA. - What is the shutdown current of the INA238AIDGSR?
The shutdown current is 5 µA (maximum). - What is the speed of the I2C interface in the INA238AIDGSR?
The I2C interface operates at 2.94 MHz. - How many pin-selectable addresses does the INA238AIDGSR support?
The device supports 16 pin-selectable addresses. - What is the range of programmable ADC conversion times in the INA238AIDGSR?
The ADC conversion times can be programmed from 50 µs to 4.12 ms. - What is the range of sample averaging in the INA238AIDGSR?
The sample averaging can be set from 1x to 1024x.
