ACS715 Current Sensor Carrier 0 to 30A
 

This current sensor is a carrier board or breakout board for Allegro’s ACS715LLCTR-30A-T
Hall effect-based linear current sensor; we therefore recommend careful reading of the ACS715 datasheet (593k pdf)
before using this product.
The sensor operates at 5 V and has an output sensitivity of 133 mV/A.
The board ships fully populated with its SMD components, including the ACS715, as shown in the product picture.
 

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 +i arrow.

We sell a ±5A bidirectional version and ±30A bidirectional version 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 bottom silkscreen.
This version is marked with a black X.
 

Using the sensor

The sensor requires a supply voltage of 4.5 – 5.5 V 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.
When Vcc is 5 V, this output voltage is offset by 500 mV and increases by 133 mV per amp of input current.
The output voltage decreases linearly below 500 mV for currents as low as -1.5 A.

מפרט:

• Designed for unidirectional input current from 0 to 30 A,
  but the sensor will provide meaningful feedback for currents as low as -1.5 A, and the robust 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, 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 ±1.5% at room temperature with factory calibration, an extremely stable output offset voltage, and almost zero magnetic hysteresis.
• Automotive-grade operating temperature range of -40°C to 150°C.

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