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ACS72981LLRATR-100U3 Current Sensor Compact Carrier 0A to 100A, 3.3V

This board is a simple compact carrier of Allegro’s ACS72981LLRATR-100U3 Hall effect-based linear current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.

AUD$ 14.95

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Our Code: SKU-010517

Supplier Link: [Pololu MPN:5255]

Description

Overview

ACS72981 Current Sensor Compact Carrier basic dimensions with US quarter for size reference.

We are offering these compact breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS72981xLR Hall effect-based linear current sensors; we therefore recommend careful reading of the ACS72981 datasheet before using this product. The following list details some of the sensor’s key features:

  • Differential Hall sensing rejects common-mode fields, so the orientation of the sensor relative to uniform external magnetic fields (e.g. the Earth’s magnetic field) has less effect on the measurement.
  • The conductive path internal resistance is typically 0.2 mΩ, and the PCB is made with 6 layers of 2-oz copper, so very little power is lost in the module.
  • Use of a Hall effect sensor means the IC is able to electrically isolate the current path from the sensor’s electronics, which allows the sensor to be inserted anywhere along the current path and to be used in applications that require electrical isolation.
  • High-bandwidth 250 kHz analogue output voltage proportional to AC or DC currents.
  • Less than 2 µs response time.
  • 3.3V and 5V versions available.
  • Integrated digital temperature compensation circuitry allows improved accuracy over the full operating temperature range.

The pads are labelled on the bottom silkscreen. The silkscreen also shows the direction that is interpreted as positive current flow via the +i arrow.

Details for item #5255

ACS72981LLRATR-100U3 Current Sensor Compact Carrier 0A to 100A, 3.3V, bottom view.

ACS72981 Current Sensor Compact Carrier.

This carrier features the ACS72981LLRATR-100U3, which is intended for nominal 3.3 V operation and is designed for unidirectional input current from 0 A to 100 A. This version can be visually distinguished from the other versions by the “3V3 U10” printed on the bottom side, as shown in the left picture above.

Part Suffix Range Sensitivity @ 3.3 V Zero Point @ 3.3 V Supply Voltage Size
100U3 0-100 A (unidirectional) 26.4 mV/A 0.33 V 3.0 V to 3.6 V 0.7″×0.8″

Using the sensor

ACS72981 Current Sensor Compact Carrier pinout.

This sensor has five required connections: the input current (IP+ and IP-), logic power (VCC and GND), and the sensor output (VIOUT).

The sensor requires a supply voltage of 3.0 V to 3.6 V to be connected across the VCC and GND pads, which are labelled on the bottom silkscreen. The sensor outputs a ratiometric analogue voltage on VIOUT that has a zero point at VCC/10 and increases by 26.4 mV × (VCC/3.3 V) per amp of input current:

``text(VIOUT) = text(VCC) / 10 + 0.0264 V/A * text(VCC) / (3.3 V) * text(IP) = text(VCC) * (1/10 + text(IP) / (125 A))``

``text(IP) = 125A * (text(VIOUT) / text(VCC) – 1/10)``

The VIOUT, VCC, and GND pins work with 0.1″-pitch header pins and are compatible with standard solderless breadboards.

ACS72981 Current Sensor Compact Carrier basic dimensions of current path connection holes and mounting holes.

You can insert the board into your current path in a variety of ways. For typical high-current applications, you can solder wires directly to the through-holes that best match your wires, or you can use solderless ring terminal connectors, as shown in the picture above. The largest through-holes are big enough for 8 AWG wires or #6 or M3.5 screws, and the second-largest through-holes (and mounting holes) are sized for 12 AWG wires or #2 or M2 screws. Holes with 0.1″, 3.5 mm, and 5 mm spacing are also available as shown in the diagram above for connecting male header pins or terminal blocks, but please note that these connection options will generally not be suitable for the kinds of currents this sensor is intended for.

ACS72981 Current Sensor Compact Carrier with wires connected via solderless ring terminals and header pins soldered for use with a breadboard.

ACS72981 Current Sensor Compact Carrier with wires soldered directly to the board.

ACS72981 Current Sensor Compact Carrier with wires connected via solderless ring terminals and header pins soldered for use with a breadboard, jumper wires, or 0.1″-pitch connectors.

ACS72981 Current Sensor Compact Carrier with wires soldered directly to the board. (1)

Warning: This product is intended for use below 30 V. Working with higher voltages can be extremely dangerous and should only be attempted by qualified individuals with appropriate equipment and protective gear.

Schematic and dimension diagrams

ACS72981 Current Sensor Carrier schematic diagram.

The dimension diagram is available as a downloadable PDF (264k pdf).

Specifications

Dimensions

Size: 0.7" x 0.8"
Weight: 1.4 g

General specifications

Typical operating voltage: 3.3 V
Current sense: 26.4 mV/A1
Minimum logic voltage: 3.0 V
Maximum logic voltage: 3.6 V
Supply current: 14 mA2
Version: 0A to 100A (unidirectional 100A), 3.3V
Current sensor: Allegro ACS72981LLRATR-100U3

Identifying markings

PCB dev codes: cs04a
Other PCB markings: 0J14752
Other PCB markings: 3V3 U10

Notes:

1
At VCC = 3.3 V.
2
Typical.

Resources

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