Sensing current passing through the circuit is an essential requirement for many applications. While some requirements are straight forward and not so critical, some environments of current sensing require special considerations. In this post, we will list some of the critical inputs required to select a current sensor.
- Current range to be measured
- Voltage range that can be supplied to sensing terminals
- Supply voltage to current sensor
- Accuracy of measurement
- Resolution of the ADC inside the sensor
- Response time of the current sensor
- Isolated or non-isolated
- Protection - Over current, short circuit
- Interface to microcontroller (most current sensors are I2C based)
- Sensing type - High side or Low side
- Package type of the IC
- Operating temperature
- Quiescent current of the current sensor IC
Here is the block diagram of the INA219 current sensor from Texas Instruments. We can see form the registers that power, voltage and current can be measured.
You can get more details of the current sensor from one of our old articles.
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