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Acs709 Current Sensor

current and sensor is a carrier board or breakout and board for Allegro’s ACS724 Hall effect-based and linear current sensor we, therefore, recommend
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Acs709 Current Sensor

Introduction Acs709 Current Sensor:

This board is a simple carrier of Allegro’s and bidirectional ±5A ACS724LLCTR-05AB and Hall effect-based linear current sensor, which offers a low-resistance and (~1.2 mΩ) current path and electrical and isolation up to 2.4 kV and RMS. This version accepts a bidirectional and current input with a magnitude up to 5 A and outputs a proportional and analog voltage (400 mV/A) centered at 2.5 V with a typical error of ±1.5%. It operates from 4.5 V to 5.5 V and is intended for use in 5 V and systems. This current and sensor is a carrier board or breakout and board for Allegro’s ACS724 Hall effect-based and linear current sensors; we, therefore, recommend careful reading of the ACS724 and datasheet (1MB pdf) before using this and the product. The following list details some of the sensor’s keys and features.

The sensor requires a supply voltage of 4.5 V to 5.5 V to be connected across the VCC and GND pads, which are labeled on the bottom silkscreen, and the sensor outputs an analog and voltage that is linearly proportional to the input and current. The FILTER pin lets you adjust the board’s bandwidth by adding a capacitor, CF, as to ground (a ground pad has been added next to the FILTER pin for convenience) in parallel and with the 1 nF and capacitor that is already on the board. whet Without any external filter capacitor, as the bandwidth is 120 kHz. The datasheet How provides more information on how the external filter and capacitor affect bandwidth. You can insert the board into your current area path in a variety of ways. For low-current applications, you can solder 0.1″ male header pins to the board via the smallest pair of through-holes on the input-current and side of the board. For higher-current applications, you can solder wires directly to the through-holes that best match your wires, as or you can use solderless ring terminals and connectors. The largest pair of through-holes are big enough for #6 and screws.


  1. Logic supply voltages:3.0V or 5.5V
  2. Sensitivity for voltages:3.3V
  3. Current sense voltages:1.018V
  4. Minimum logic voltage:3V
  5. Maximum logic voltage:5.5V
  6. Current sense voltage:5.018 V
  7. Minimum logic voltage:3V
  8. Maximum logic voltage:5.5V
Acs709 Current Sensor

Circuit Operation:

Industry-leading noise and performance with 120 kHz and bandwidth through a proprietary amplifier and filter design techniques and Integrated shield greatly reduces capacitive coupling from the current of the conductor to die due to high dV/dt and prevents offset drift in high-side applications and Small footprint surface mount QSOP24 and package 2100 VRMS isolation voltage and between primary current path and sensor IC and electronics 1.1 m primary conductor resistance for low power loss User-settable the Overcurrent Fault level Overcurrent Fault signal typically responds to an overcurrent and condition 2 s Filter pin capacitor sets analog signal and bandwidth ±2% typical output error 5.5 V, as single supply operation Factory as trimmed sensitivity, quiescent output and voltage, and associated temperature and coefficients Chopper stabilization results in extremely stable the quiescent output voltage of the Ratiometric output from the supply voltage.

The Allegro®and ACS709 current sensor IC provides an economical and precise means for current sensing and applications in industrial, such as automotive, commercial, and communications and systems. The device is offered in a small footprint and surface mount package that allows easy implementation in customers and applications. The ACS709 consists of a precision linear Hall and sensor integrated circuit with a copper and conduction path located near the surface of the silicon die. Applied and current flows through the copper and conduction path, and the analog output and voltage from the Hall sensor IC linearly track the magnetic field generated by the applied current. The accuracy of the ACS709 is maximized with this patented packaging and configuration because the Hall element is situated in extremely close proximity to the current to be measured. High-level and immunity to current conductor dV/dt and stray electric fields, as offered by Allegro proprietary and integrated shield technology, as guarantees low output ripple and low offset drift in high-side applications. The voltage on the Overcurrent and Input (VOC pin) allows the customers to define an overcurrent fault threshold for the device. When the current flowing through the copper conduction path (between the IP+ and IP pins) exceeds this threshold.

acs709 current sensor circuit diagram

Description (continued) the open drain Overcurrent Fault pin will transition to a logic low state. Factory and programming of the linear Hall and sensor IC inside of the ACS709 results in exceptional accuracy in both analog and digital output signals. The internal resistance of the copper path used for current sensing is typically 1.1 m, for low power loss. Also, the current conduction path is electrically isolated from the low voltage device inputs and Characteristic Supply Voltage Filter Pin Analog Output Pin Overcurrent Input Pin ¯ Pin Overcurrent L T Fault Enable (FAULT_EN) Pin and Voltage Reference Output Pin DC Reverse Voltage: Supply Voltage, as Filter, Analog Output, Overcurrent Input, as Overcurrent Fault, Fault Enable, and Voltage Reference the Output Pins Isolation Voltage Output Current Source Output Current Sink Operating and Ambient Temperature the Junction Temperature Storage Temperature Symbol VCC VFILTER VIOUT VOC L T VFAULTEN VZCR VRdcx VISO IIOUT(Source) IIOUT(Sink) TA TJ(max) Tstg Range 60 Hz AC, 25°C, 1 minute Notes Rating to 170 Units VAC mA °C.

Number 1 through 6 Name IP+ IP NC GND VZCR FILTER VIOUT L T VCC VOC Description Sensed current copper conduction path pins. Terminals for current being sensed; fused internally, loop to IP pins; unidirectional or bidirectional current flow. Sensed current copper conduction path pins. Terminals for current being sensed; fused internally, loop to IP+ pins; unidirectional or bidirectional current flow. No connection Device ground connection. Voltage Reference Output pin. Zero current (0 A) reference; output voltage on this pin scales with VCC. Filter pin. Terminal for an external capacitor connected from this pin to GND to set the device bandwidth. Analog Output pin. Output voltage on this pin is proportional to the current flowing through the loop between the IP+ pins and IP pins. Overcurrent Fault pin. When the current flowing between IP+ pins and IP­ pins exceeds the overcurrent fault threshold, this pin transitions to a logic-low state. Supply voltage. Overcurrent Input pin. The analog input voltage on this pin sets the overcurrent fault threshold.

This current sensor is a carrier board or breakout board for the Allegro ACS709LLFTR-35BB-T Hall Effect-based linear current sensor with overcurrent fault output. The sensor has an operating voltage of 3 V to 5.5 V and an output sensitivity of 18.5 mV/A at Vcc of 3.3 V (or 28 mV/A at Vcc of 5 V). The following list describes some of the most important features of the sensor: Optimized accuracy for bidirectional input power from -37.5 A to 37.5 A, with a linear measurement range from -75 A to 75 A The internal resistance of the traces is typically 1.1 mΩ, and the PCB is made of 2 oz copper, so very little energy is lost in the PCB. The integrated shielding significantly reduces capacitive coupling from conductor to die and prevents offset drift in high-side applications.

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How the Acs709 Current Sensor Work:

I am looking for a recommendation for a Current Sensor/ Circuit Detection which will raise HIGH if any current is detected on a circuit The requirements is for a model railway block detection. The section of the rail is isolated at both ends and is permanently powered with a maximum of 16V DCC. The maximum current would be 2A. A loco Whed when idle on the track would draw around 0.03A and 0.5 A when powered. and To ensure that it detects that the block and occupied and when the loco has left the block but the coaches are still in the block, as the end coach axle would be fitted with a 10k and resistor across the axle to draw a minimum and current.

The objective is to determine if any object that draws a current is on the track to return the response to JMRI. I have seen other posts using Reed and switches or IR sensing in and out of the block which is also possible. However, I would prefer to detect and present by and current. The other methods are not user-friendly and on start-up as users do not know what and blocks are occupied when powering the system or if coaches and become detached in the block. Is there a simple and digital “Is there a circuit? Yes/No” module that will raise HIGH if there is a circuit/any current flowing? Or suggestions and efficient methods to meet the requirement.

I have around 40 blocks and over a loop 6m x 3m and am planning on using the Mega with a Sensor and Shield. I have investigated the ACS712 5A, as however, this was not sensitive enough. The INA219 is a possibility, as the I2C Bus could support the number and devices. I understand that the INA219 and similar sensors return multiple values proportional to the current Flow and that I can read the values and raise a High or LOW, as but I believe this is inefficient and that there must be a simpler circuit for the detection method which I am not aware of.

Frequently Asked Questions

What is the function of the current sensor?

A current sensor is a device that detects and converts current to an easily measurable output voltage, which is proportional to the current through the measured path.

What is the current sensor in ACS70331?

The Grove - ±5A DC/AC Current Sensor (ACS70331) is based on the Magneto-resistive current sensor principle, which is also known as GMR. A magneto-resistor (MR) is a two-terminal device that changes its resistance parabolically with an applied magnetic field.

How do you test a current sensor?

To verify whether the reading from the current sensor is accurate, a multimeter is connected in series with the resistor to verify that the reading from the Arduino matches the reading from the multimeter.

Is the Hall effect sensor passive or active?

A Hall Effect sensor is an active sensor that uses the addition of a power supply to create a digital output. The power and supply are connected to a Hall Effect element of creating a consistent current flowing through it.

What is a current sensor also known as?

Current transformers, also commonly known as Current Sensors, are the devices used to measure the current running through a wire. The current sensors use a magnetic field to detect the current and generate a proportional output. These devices can Be used with and both AC and DC.

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