ACS722LLCTR-10AB-T Detailed explanation of pin function specifications and circuit principle instructions

The part you mentioned, "ACS722LLCTR-10AB-T", is a product manufactured by Allegro Microsystems. It is a current sensor IC that utilizes the Hall Effect to measure current.

The specific part number you provided, "ACS722LLCTR-10AB-T", indicates a 10A Hall Effect current sensor IC in a TSSOP-14 (Thin Shrink Small Outline Package) package. Below, I'll give a comprehensive explanation of the pins and their functions, followed by a table detailing the pinout and the 20 most frequently asked questions about the ACS722LLCTR-10AB-T.

Pin Function Specifications

Pinout for ACS722LLCTR-10AB-T (TSSOP-14) Package:

The ACS722LLCTR-10AB-T comes in a 14-pin package, and the pin functions are as follows:

Pin Number Pin Name Function Description 1 Vdd Supply Voltage (5V typical, 3.3V to 5.5V range) 2 OUT Analog Output (The voltage corresponding to the measured current) 3 Vss Ground (0V reference) 4 Ip+ Positive current input (for measuring current flow) 5 Ip- Negative current input (for measuring current flow) 6 NC No connection (reserved pin) 7 NC No connection (reserved pin) 8 Vdd Supply Voltage (mirrors pin 1) 9 Vss Ground (mirrors pin 3) 10 NC No connection (reserved pin) 11 NC No connection (reserved pin) 12 NC No connection (reserved pin) 13 Ip+ Positive current input (mirrors pin 4) 14 Ip- Negative current input (mirrors pin 5) Pin Functions in Detail:

Vdd (Pin 1, 8): This is the supply voltage pin for the device. The ACS722 typically operates with a supply voltage of 5V (but can range from 3.3V to 5.5V). It provides the power necessary for the IC to operate.

OUT (Pin 2): This is the analog output pin. The voltage here is proportional to the current flowing through the sensor. The output voltage varies depending on the amount of current sensed, with a baseline voltage (typically 2.5V) at zero current.

Vss (Pin 3, 9): This is the ground pin for the device. It serves as the reference voltage for the sensor and is typically connected to the system ground.

Ip+ (Pin 4, 13): This is the positive input for current sensing. It is the input through which the current flowing in the system enters the Hall effect sensor.

Ip- (Pin 5, 14): This is the negative input for current sensing. It serves as the return path for the current entering through Ip+.

NC (Pins 6, 7, 10, 11, 12): These pins are marked as No Connection (NC). They are not connected internally within the IC and can be ignored during implementation.

Detailed Circuit Principle and Usage Explanation:

The ACS722 is a Hall Effect-based current sensor, meaning it uses the magnetic field generated by current flowing through a conductor to generate a proportional voltage output. This device is designed for precise current sensing in applications that require low-side current measurement, such as power supplies, motor control systems, and other electronic devices.

The key principle is the use of a magnetic field to create an output voltage that is proportional to the measured current. The sensor outputs a voltage that is linear over a wide range of currents, and the voltage range spans from Vss to Vdd, with a midpoint corresponding to zero current.

20 Common FAQ for ACS722LLCTR-10AB-T:

What is the typical application of the ACS722LLCTR-10AB-T? The ACS722LLCTR-10AB-T is typically used for measuring DC or AC current in a circuit, especially in power supplies and motor control applications. What is the output voltage when no current is flowing through the sensor? The output voltage is typically 2.5V when no current is flowing through the sensor (zero current). What is the supply voltage range for the ACS722? The supply voltage range is from 3.3V to 5.5V, with 5V being typical. Can the ACS722 measure both AC and DC currents? Yes, the ACS722 can measure both AC and DC currents, as it provides an analog output proportional to the current. What is the maximum current that can be measured by the ACS722LLCTR-10AB-T? The ACS722LLCTR-10AB-T can measure currents up to 10A, either in the positive or negative direction. How does the ACS722 measure current? The ACS722 uses the Hall Effect to measure the magnetic field generated by current flowing through a conductor. This magnetic field is converted into a proportional voltage output. What is the output signal's voltage range? The output voltage of the ACS722 spans from 0V to Vdd, with the midpoint being 2.5V for zero current. What happens if the supply voltage is below the recommended range? If the supply voltage is below the recommended range, the sensor may not function correctly, and the output signal may become inaccurate. How precise is the ACS722's current measurement? The accuracy of the ACS722 is typically very high, with an offset voltage of ±20mV and a sensitivity of 185mV per ampere.

Can the ACS722 be used for measuring bidirectional currents?

Yes, the ACS722 can measure both positive and negative currents due to the Hall Effect-based sensing mechanism.

What is the purpose of the NC pins?

The NC pins (Pins 6, 7, 10, 11, 12) are reserved for future use or internal connections and can be ignored in circuit design.

What is the typical output voltage at 10A current?

At 10A current, the output voltage will be approximately 3.5V if the supply voltage is 5V.

Is the ACS722 sensitive to external magnetic fields?

Yes, the ACS722 is sensitive to external magnetic fields, and these can influence the accuracy of the measurements if they are too strong.

What type of current can the ACS722 measure?

The ACS722 measures both DC and AC currents, but AC measurements require the current to be within the specified frequency range of the device.

How do I interface the ACS722 with a microcontroller?

You can connect the output pin (Pin 2) of the ACS722 directly to an analog input pin of a microcontroller to read the voltage corresponding to the measured current.

What is the temperature coefficient of the ACS722?

The temperature coefficient for the ACS722 is typically around 0.01% per °C, meaning the sensor's accuracy decreases slightly with changes in temperature.

Can the ACS722 be used in automotive applications?

Yes, the ACS722 is ideal for automotive applications, as it can handle the wide voltage ranges and harsh environmental conditions typically found in automotive systems.

What is the role of the Ip+ and Ip- pins?

The Ip+ and Ip- pins are used to connect the conductor through which the current to be measured is flowing. The differential magnetic field produced by the current is sensed via these pins.

How should I filter the output signal?

It is common practice to use a low-pass filter ( capacitor ) at the output to reduce high-frequency noise from the analog output.

What is the typical cost of the ACS722LLCTR-10AB-T?

The cost of the ACS722LLCTR-10AB-T typically varies based on the supplier and order quantity, but it is generally affordable for bulk orders.

If you need further details or clarifications on any of the points above, feel free to ask!