Overview
The INA237AIDGST from Texas Instruments is a highly precise digital power monitor designed specifically for current-sensing applications. This device features a 16-bit delta-sigma ADC, enabling high-resolution measurements of current, voltage, and power. It operates within a wide common-mode range of –0.3 V to +85 V, making it suitable for both high-side and low-side current measurements. The INA237AIDGST integrates a temperature sensor and supports bus voltage measurements from 0 V to 85 V. It is particularly useful in systems requiring accurate and reliable power monitoring, such as DC/DC converters, industrial battery packs, and telecom equipment.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| ADC Resolution | 16-bit | |
| Offset Voltage | ±50 µV (maximum) | µV |
| Offset Drift | ±0.02 µV/°C (maximum) | µV/°C |
| Gain Error | ±0.3% (maximum) | % |
| Gain Error Drift | ±50 ppm/°C (maximum) | ppm/°C |
| Common Mode Rejection | 120 dB (minimum) | dB |
| Power Monitoring Accuracy | 1.6% full scale, –40°C to +125°C (maximum) | % |
| Alert Response Time | 75 µs | µs |
| Common-Mode Range | –0.3 V to +85 V | V |
| Bus Voltage Sense Input | 0 V to 85 V | V |
| Shunt Full-Scale Differential Range | ±163.84 mV / ±40.96 mV | mV |
| Input Bias Current | 2.5 nA (maximum) | nA |
| Temperature Sensor Accuracy | ±1°C (maximum at 25°C) | °C |
| Supply Voltage | 2.7 V to 5.5 V | V |
| Operational Current | 640 µA (typical) | µA |
| Shutdown Current | 5 µA (maximum) | µA |
| I2C Interface Speed | 2.94 MHz | MHz |
Key Features
- High-Resolution ADC: 16-bit delta-sigma ADC for precise current, voltage, and power measurements.
- Current Monitoring Accuracy: High accuracy with offset voltage of ±50 µV, offset drift of ±0.02 µV/°C, and gain error of ±0.3%.
- Wide Common-Mode Range: Supports common-mode voltages from –0.3 V to +85 V.
- Bus Voltage Measurement: Measures bus voltage from 0 V to 85 V.
- Integrated Temperature Sensor: ±1°C accurate temperature sensor for monitoring system ambient temperature.
- Programmable Conversion Time and Averaging: Conversion times from 50 µs to 4.12 ms and averaging from 1x to 1024x.
- Fast Alert Response: Alert response time of 75 µs.
- High-Speed I2C Interface: 2.94 MHz I2C interface with 16 pin-selectable addresses.
- Low Power Consumption: Operational current of 640 µA (typical) and shutdown current of 5 µA (maximum).
Applications
- DC/DC Converters and Power Inverters: Accurate power monitoring in power conversion systems.
- Industrial Battery Packs: Monitoring of battery health and performance.
- Power-over-Ethernet (PoE): Precise current and voltage monitoring in PoE systems.
- Telecom Equipment: Reliable power monitoring in telecommunications infrastructure.
- Enterprise Servers: Power management and monitoring in server systems.
Q & A
- What is the resolution of the ADC in the INA237AIDGST?
The INA237AIDGST features a 16-bit delta-sigma ADC.
- What is the common-mode voltage range supported by the INA237AIDGST?
The device supports common-mode voltages from –0.3 V to +85 V.
- How accurate is the temperature sensor in the INA237AIDGST?
The integrated temperature sensor has an accuracy of ±1°C at 25°C.
- What is the range of the bus voltage sense input for the INA237AIDGST?
The bus voltage sense input can measure voltages from 0 V to 85 V.
- What are the programmable conversion times for the INA237AIDGST?
The conversion times can be set from 50 µs to 4.12 ms.
- How does the INA237AIDGST handle averaging of measurements?
The device allows for programmable averaging from 1x to 1024x.
- What is the alert response time of the INA237AIDGST?
The alert response time is 75 µs.
- What is the operational current of the INA237AIDGST?
The typical operational current is 640 µA.
- What is the shutdown current of the INA237AIDGST?
The maximum shutdown current is 5 µA.
- What applications is the INA237AIDGST suitable for?
The device is suitable for DC/DC converters, industrial battery packs, Power-over-Ethernet (PoE), telecom equipment, and enterprise servers.
