Pololu ACS711EX Current Sensor Carrier -31A to +31A

Item number: PO2453

SKU: 2453

This board is a simple carrier of Allegro?s ?31?A ACS711 Hall effect-based linear current sensor with overcurrent fault output, which offers a low-resistance (~0.6?m?) current path and electrical isolation up to 100?V. This version accepts a bidirectional current input with a magnitude up to 31?A and outputs a proportional analog voltage centered at Vcc/2 with a typical error of ?4%. It operates from 3?V to 5.5?V, so it can interface directly to both 3.3?V and 5?V systems.

Category: Current sensors


3,61

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Description

This board is a simple carrier of Allegros 31A ACS711 Hall effect-based linear current sensor with overcurrent fault output, which offers a low-resistance (~0.6mO) current path and electrical isolation up to 100V. This version accepts a bidirectional current input with a magnitude up to 31A and outputs a proportional analog voltage centered at Vcc/2 with a typical error of 4%. It operates from 3V to 5.5V, so it can interface directly to both 3.3V and 5V systems.

Overview

This current sensor is a carrier board or breakout board for Allegro?s ACS711KEXLT-31AB-T Hall effect-based linear current sensor with overcurrent fault output; we therefore recommend careful reading of theACS711 datasheet(533k pdf) before using this product. This sensor has an operating voltage of 3V to 5.5V and an output sensitivity of 45mV/A when Vcc is 3.3V (or 68mV/A when Vcc is 5V). The following list details some of the sensor?s key features:

  • Designed for bidirectional input current from -31A to 31A (though the robust sensor IC can tolerate 100ms transient current spikes up to 100A).
  • Conductive path internal resistance is typically 0.6mO, and the PCB is made with 2-oz copper, so very little power is lost in the board.
  • Use of a Hall effect sensor means the IC is able to electrically isolate the current path from the sensor?s electronics (for applications up to 100V), which allows the sensor to be inserted anywhere along the current path and to be used in applications that require electrical isolation.
  • 100kHz bandwidth.
  • Good accuracy and reliability: factory calibration results in a typical total output error of 4% at room temperature, the output offset voltage is extremely stable, and the sensor has zero magnetic hysteresis.
  • OvercurrentFAULToutput latches low when current magnitude exceeds 31A.
  • Operating temperature range of -40C to 125C.

The pads are labeled on the bottom silkscreen, as shown in the picture to the right. The silkscreen also shows the direction that is interpreted as positive current flow via the+iarrow.

This 31A current sensor is marked with agreen X. We also sell a15.5A versionthat uses the same carrier PCB; you can distinguish the versions by reading the text on the IC or by looking at the color of the X on the bottom silkscreen.

This sensor is very similar to our originalACS711 -25 to +25A Current Sensor Carrier, but uses a smaller "EX" package that has a larger optimized sensing range and reduced internal resistance. The board size, pinout, and hole locations are all unchanged, so it can generally be used as a drop-in replacement for our ACS711 carriers with "LC" packages.

Using the sensor

Electrical connections

The sensor requires a supply voltage of 3V to 5.5V to be connected across the Vcc and GND pads, which are labeled on the bottom silkscreen. The sensor outputs an analog voltage that is linearly proportional to the input current. The quiescent output voltage is Vcc/2 and changes by 45mV per amp of input current (when Vcc=3.3V), with positive current increasing the output voltage and negative current decreasing the output voltage. The relationship between the instantaneous input current,i, and sensor output voltage, VOUT, can be represented by the following equations:

TheFAULTpin is normally high and latches low when the current exceeds 31A. Once theFAULTpin is latched low, the only way to reset it is by toggling power on the Vcc pin. In our tests, this module was able to handle 31A of continuous current without exceeding 100C, with no cooling beyond the heat dissipation of the PCB.

ACS711EX current sensor carrier connection and mounting dimension diagram.
ACS711 current sensor carrier (LC package version) with solderless ring terminal connectors (not included).

The input current can be connected to the board in a variety of ways. Holes with 0.1", 3.5mm, and 5mm spacing are available as shown in the diagram above for connectingmale header pinsorterminal blocks. For 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 large through-holes are big enough for #6 screws.

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

Mounting information

The board has two mounting holes on the logic side of the board. These mounting holes are 0.5" apart and are designed for#2 screws.

Schematic diagram

ACS711 current sensor carrier schematic diagram.

Pack List:
1x ACS711EX Current Sensor Carrier -31A to +31A


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