CURRENT SENSOR
General Description:
For measuring current in a circuit, a sensor is required. ACS712 Current Sensor is the sensor that can be used to measure and calculate the amount of current applied to the conductor without affecting the performance of the system. ACS712 Current Sensor is a fully integrated, Hall- effect-based linear sensor IC. This IC has a 2.1kV RMS voltage isolation along with a low-resistance current conductor.
Working Principle:
A Current Sensor detects current in a wire and produces a signal proportional to it, typically as analog voltage or digital output. Sensing methods include Direct, using Ohm's law to measure voltage drop, and Indirect, calculating the magnetic field generated by the current flow using Faraday's law. The ACS712 Current Sensor employs Indirect Sensing, employing a low-offset Hall effect sensor circuit. Current flowing through a copper path on the IC generates a magnetic field, detected by the Hall sensor, producing a voltage proportional to the current for measurement.
Specifications:
1. Low-noise analog signal path
2. Device bandwidth is set via the new FILTER pin
3. 5 µs output rise time in response to step input current
4. Small footprint, low-profile SOIC8 package
5. 2.1 kV RMS minimum isolation voltage from pins 1-4 to pins 5-8
6. Supply Voltage: 4.5V~5.5V DC
7. Measure Current Range: 30A
8. Sensitivity: 100mV/A
Requirements
| S. No. | Component Name | Values |
|---|---|---|
| 1 | ACS712 Chip | |
| 2 | Resistors | 1k |
| 3 | Capacitors | 100nF, 1nF |
| 4 | LED | |
| 5 | Male Connector Pins | 3 |
| 6 | Terminal Block | 2 |
Pin configuration:
| S. No. | Pins | Pin Description |
|---|---|---|
| 1 | Vcc | Input voltage is +5V for typical applications |
| 2 | Output | Outputs Analog voltage proportional to current |
| 3 | Ground | Connected to the ground of the circuit |
| 4 | Wire In | The wire through current has to be measured is connected here |
| 5 | Wire Out | The wire is connected to the power source |
Pin Diagrams:
Applications:
1. It is used in many industrial, commercial, and communication applications.
2. This IC is applicable for Automobile applications.
3. The applications of this IC can be found in motor control circuits, for load detection and management, SMPS, over current fault protection circuits.
For more info: Refer the Datasheets!
ACS712_Datasheet_Current sense ic