ACS712ELCTR-20A-T Detailed explanation of pin function specifications and circuit principle instructions（251 ）

The ACS712ELCTR-20A-T is a Hall-effect based current sensor manufactured by Allegro Microsystems. It is designed to measure both AC and DC currents in a wide range of applications.

1. Package Type and Pin Count:

The ACS712ELCTR-20A-T is packaged in a 5-pin package (SOIC-5), which is a small-outline integrated circuit (SOIC) with 5 pins for connection.

2. Pin Function Specification:

Here’s the detailed description of the pin functions:

Pin Name Function Description 1 VCC This is the positive power supply pin. It supplies the operating voltage for the ACS712. The typical value is 5V. 2 OUT This is the output pin. It provides a voltage corresponding to the measured current. This output is typically referenced to VCC/2 (2.5V for a 5V supply) when no current is flowing. The output voltage is proportional to the input current. 3 GND This is the ground pin. It is connected to the circuit ground. 4 IP+ This is the positive current input pin. It is where the current being measured flows into the sensor. It is connected to the high side of the circuit through which the current flows. 5 IP- This is the negative current input pin. It is where the current being measured flows out of the sensor. It is connected to the low side of the circuit through which the current flows.

3. Functional Principle of the Circuit:

The ACS712 works based on the Hall effect to measure the current flowing through a conductor. The device contains a Hall sensor, which detects the magnetic field generated by the current-carrying conductor. This magnetic field interacts with the Hall element inside the sensor, creating a voltage output. The voltage output varies linearly with the amount of current flowing through the conductor.

The device operates in a way that:

When the current is zero, the output voltage is VCC/2 (typically 2.5V for a 5V supply). If the current is positive, the output voltage increases above the quiescent voltage. If the current is negative, the output voltage decreases below the quiescent voltage.

This output voltage can then be read by a microcontroller or other measurement system to determine the current.

4. FAQ - Frequently Asked Questions

Here are 20 commonly asked questions about the ACS712ELCTR-20A-T and its functionalities:

What is the operating voltage range of the ACS712ELCTR-20A-T? The typical operating voltage is 5V, with a range of 4.5V to 5.5V. What is the typical output voltage when no current is flowing? The output voltage is typically 2.5V when no current is flowing, referenced to VCC/2. Can the ACS712ELCTR-20A-T measure both AC and DC currents? Yes, the ACS712ELCTR-20A-T can measure both AC and DC currents. How does the ACS712ELCTR-20A-T communicate the measured current? The sensor outputs an analog voltage that is proportional to the current being measured. What is the accuracy of the ACS712ELCTR-20A-T? The typical accuracy is ±1.5% at room temperature. What is the maximum measurable current for the ACS712ELCTR-20A-T? The maximum measurable current is ±20A. What is the sensitivity of the ACS712ELCTR-20A-T? The sensitivity is 185mV per ampere (mV/A). What is the response time of the ACS712ELCTR-20A-T? The response time is typically 5µs. Is the output voltage of the ACS712ELCTR-20A-T linear? Yes, the output voltage is linearly proportional to the measured current.

What is the quiescent voltage output for a 5V supply?

The quiescent output voltage is 2.5V for a 5V supply.

Can the ACS712ELCTR-20A-T be used in high-voltage applications?

The ACS712 is intended for low-voltage applications and cannot be used directly for high-voltage power line measurements.

Is the ACS712ELCTR-20A-T capable of reverse current measurement?

Yes, it can measure negative (reverse) currents and provide a corresponding lower output voltage.

What is the recommended load for the ACS712ELCTR-20A-T?

The recommended load for the output is 10kΩ to 100kΩ.

What happens if the current exceeds the measurement range of the ACS712ELCTR-20A-T?

If the current exceeds the maximum range, the output voltage will saturate, and the sensor will no longer give accurate readings.

Can the ACS712ELCTR-20A-T be used to measure AC current directly?

Yes, the ACS712 can measure AC current directly; the output will vary with the AC waveform.

Is the ACS712ELCTR-20A-T a bidirectional current sensor?

Yes, the ACS712ELCTR-20A-T is capable of measuring both positive and negative currents.

Can the ACS712ELCTR-20A-T be used in automotive applications?

Yes, the ACS712 can be used in automotive applications as it operates in a range suitable for automotive circuits.

What is the power consumption of the ACS712ELCTR-20A-T?

The power consumption is very low, typically around 15mA during operation.

What type of output does the ACS712ELCTR-20A-T provide?

The ACS712 provides an analog voltage output that corresponds to the measured current.

What is the temperature range for operating the ACS712ELCTR-20A-T?

The operating temperature range is -40°C to +85°C.

This detailed breakdown should give you a comprehensive understanding of the ACS712ELCTR-20A-T sensor, including its pins, functionality, circuit principles, and FAQs. If you need further details or assistance, feel free to ask!