Datasheet

Table Of Contents

RB-Pol-172

Pololu ±5A ACS715 Current Sensor

This board is a simple carrier of Allegro’s ±5A ACS714 Hall effect-based linear current sensor, which

offers a low-resistance (~1.2 mΩ) current path and electrical isolation up to 2.1 kV RMS. This version

accepts a bidirectional current input with a magnitude up to 5 A and outputs a proportional analog

voltage (185 mV/A) centered at 2.5 V with a typical error of ±1.5%. It operates from 4.5 to 5.5 V and is

intended for use in 5 V systems.

Overview

This current sensor is a carrier board or breakout board for Allegro’s ACS714LLCTR-05B-T Hall

effect-based linear current sensor; we therefore recommend careful reading of theACS714

datasheet (661k pdf) before using this product. The sensor operates at 5 V and has an output sensitivity

of 185 mV/A. The board ships fully populated with its SMD components, including the ACS714, as

shown in the product picture. The following list details some of the sensor’s key features:

• Designed for bidirectional input current from -5 to 5 A (though the robust sensor IC can survive

up to five times the overcurrent condition).

• Conductive path internal resistance is typically 1.2 mΩ, and the PCB is made with 2-oz copper,

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RB-Pol-172 Pololu ±5A ACS715 Current Sensor This board is a simple carrier of Allegro’s ±5A ACS714 Hall effect-based linear current sensor, which offers a low-resistance (~1.2 mΩ) current path and electrical isolation up to 2.1 kV RMS. This version accepts a bidirectional current input with a magnitude up to 5 A and outputs a proportional analog voltage (185 mV/A) centered at 2.5 V with a typical error of ±1.5%. It operates from 4.5 to 5.5 V and is intended for use in 5 V systems.
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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 (up to 2.1 kV RMS), which allows the sensor to be inserted anywhere along the current path and to be used in applications that require electrical isolation. • 80 kHz bandwith that can optionally be decreased by adding a capacitor across the board pins marked “filter”. • High accuracy and reliability: typical total output error of ±1.
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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. Filtering the output The IC has an internal filter resistance of 1.7 kΩ, and the carrier board includes a 1 nF filter capacitor, which produces a low-pass RC filter with a 90 kHz cutoff.