ACS714 Current Sensor -30A / +30A

This current sensor is a carrier board or breakout board for Allegro's ACS714LLCTR-30A-T Hall effect based linear current sensor ; Therefore, before using this product ACS714 datasheet

Specifications

-30 A to 30 It is designed for bidirectional input current between A (the rugged sensor IC can withstand up to five times the overcurrent condition). very little power is dissipated in the board.
Using a Hall effect sensor allows the IC to electrically decouple the current path from the sensor's electronics (up to 2.1 kV RMS), allowing the sensor to be placed anywhere along the current path and requiring no electricity.
80 kHz bandwidth, which can optionally be reduced by adding capacitors to the plate pins marked "filter".
High accuracy and reliability: factory calibration at room temperature, ± an extremely constant typical total error of ±1.5% with output offset voltage and virtually zero magnetic hysteresis
Automotive grade operating temperature from -40°C to 150°C.

NOTE: This version is marked with a red X. We also sell the ±5A bidirectional version of this board; You can distinguish these versions by reading the text on the IC or by looking at the color of the X on the silkscreen underneath.

Using the Sensor

The sensor is used for connection between the Vcc and GND pads labeled on the bottom silkscreen. It requires a supply voltage of V to 5.5 V. The sensor outputs an analog voltage that is linearly proportional to the input current. When Vcc is 5 V, this output voltage is centered at 2.5 V and varies by 66 mV per input current, with positive current increasing the output voltage and negative current decreasing the output voltage.

Input current can be connected to the board in various ways. For low current applications, you can solder 0.1" male header pins to the board through small holes on the input current side of the board. For high current applications, you can solder the wires directly to the through holes.

Installation information

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

Output filtering

The IC has an internal filter resistor of 1.7 kΩ and the carrier board uses a 1 nF filter that produces a low-pass RC filter with a 90 kHz cutoff. You can increase detection system accuracy for low-frequency sensing applications by adding a capacitor in parallel with the integrated 1 nF capacitor on the pads marked “filter” on the bottom screen (this capacitor is labeled C2b in the schematic below). The frequency F at which the filter will attenuate to half its original power is as follows:

F = 1 / (2πRC) = 1 / (11kΩ * (1 nF + Cf))

where Cf is the value of the capacitor added to the filter pads.