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An assortment of unidirectional and bidirectional Hall effect-based current sensors. They offer a very low-resistance current path and electrical isolation between the current source and the measuring circuit.
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ACS709 Current Sensor Carrier -75A to 75A
Item Details
ACS709 Current Sensor Carrier -75A to 75A
Item Name:
ACS709 Current Sensor Carrier -75A to 75A
Item #:
TS-052-075
Manufacturer:
Pololu
MPN:
2199
Your Price:
$9.95
Availability:
25 Ready to Ship!
Quantity:

Product Image Gallery:

Description:

This current sensor is a carrier board or breakout board for Allegro's ACS709LLFTR-35BB-T Hall effect-based linear current sensor with overcurrent fault output; we therefore recommend careful reading of the ACS709 datasheet (1MB pdf) before using this product. The sensor has an operating voltage of 3 V to 5.5 V and an output sensitivity of 18.5 mV/A when Vcc is 3.3 V (or 28 mV/A when Vcc is 5 V). The following list details some of the sensor's key features:

  • Optimized accuracy for bidirectional input current from -37.5 A to 37.5 A, with a linear sensing range from -75 A to 75 A (see warning note below for thermal limitations).
  • Conductive path internal resistance is typically 1.1 mΩ, and the PCB is made with 2-oz copper, so very little power is lost in the board.
  • Integrated shield greatly reduces capacitive coupling from current conductor to die and prevents offset drift in high-side applications.
  • 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.
  • 120 kHz bandwidth that can optionally be decreased by adding a capacitor across the board pins marked "FILT".
  • High accuracy and reliability: typical total output error of 2% at room temperature with factory calibration, an extremely stable quiescent output voltage
  • Automotive-grade operating temperature range of -40°C to 150°C.
  • User-settable overcurrent threshold: FAULT pin output latches low when current exceeds the configured threshold for a duration that can be set through the addition of an external capacitor.

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

Features and Specifications:

  • Designed for bidirectional input current from -30 to 30 A (though the robust sensor IC can survive up to five times the overcurrent condition).
  • Conductive path internal resistance is typically 1.2 mO, 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.

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 30A unidirectional version and ±5A 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 red X.

Electrical Connections:


ACS715 current sensor carrier with solderless ring terminal connectors (not included).

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 centered at 2.5 V and changes by 66 mV per amp of input current, with positive current increasing the output voltage and negative current decreasing the output voltage.

The input current can be connected to the board in a variety of ways. For low-current applications, you can solder 0.1" male header pins to the board via the small through-holes on the input-current side of the board. For higher-current applications, you can solder wires directly to the through-holes whose sizes best match your wires, or you can use solderless ring terminal connectors, as shown in the picture to the right. The large through-holes are big enough for #6 screws.

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 kO, and the carrier board includes a 1 nF filter capacitor, which produces a low-pass RC filter with a 90 kHz cutoff. You can improve sensing system accuracy for low-frequency sensing applictations by adding a capacitor in parallel with the integrated 1 nF capacitor across the pads marked "filter" on the bottom silkscreen (this capacitor is labeled C2b in the schematic below). The frequency F that the filter will attenuate to half its original power is given by:

F = 1 / (2pRC) = 1 / (11kO * (1 nF + Cf))

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


ACS714/ACS715 current sensor carrier schematic diagram.

Dimensions:

  • Size: 0.7" x 0.8"
  • Weight: 1.3 g

General Specifications:

  • Current sense: 0.066 V/A (see Notes)
  • Minimum logic voltage: 4.5 V
  • Maximum logic voltage: 5.5 V
  • Supply current: 13 mA

Notes:

  • The sensor requires a supply voltage of 4.5 V to 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 centered at 2.5 V and changes by 66 mV per amp of input current, with positive current increasing the output voltage and negative current decreasing the output voltage.

Documentation:

 



This board is a simple carrier of Allegro’s ±75A ACS709 Hall effect-based linear current sensor with overcurrent fault output, which offers a low-resistance (~1.1 mΩ) current path and electrical isolation up to 2.1 kV RMS.
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