Testimonials Testimonials

Save 50%

Pololu ACS715 Current Sensor 0 to +30A

List price: £8.04
£4.02
(£4.82 UK, incl VAT) You save: £4.02 (50%)
Price in points: 804 points
3801-201
2 g
1 item(s)
End of line
+

This board is a simple carrier for Allegro's 30A ACS714 Hall effect-based linear current sensor. This version accepts a unidirectional current input up to 30 A. The output is an analog voltage (133 mV/A) that reads 500 mV for no input current and has a typical error of less than 1.5%.

Overview

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 (574k pdf) before using this product. The sensor operates at 5 V and has an output sensitivity of 133 mV/A. The following list details some of the sensor's key features:

  • Designed for unidirectional input current from 0 to 30A, but the sensor will provide meaningful feedback for currents as low as -1.5A, and the robust IC can survive up to five times the overcurrent condition.
  • Conductive path internal resistance is typically 1.2 mOhm, 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 - 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.

Using the Sensor

Electrical connections

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. 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.

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 M3 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 M2 screws.
Filtering the output

The IC has an internal filter resistance of 1.7k, and the carrier board includes a 1nF 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 / (2piRC) = 1 / (11k * (1 nF + Cf))

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

Downloads

Manufacturer's Details

Manufacturer's SKU :
1186
Manufacturer:
Pololu

No posts found

Write a review

No FAQ found

3801-202
£8.01 £4.01 (£4.81 UK, incl VAT)
3801-202
This board is a simple carrier for Allegro's ±30A ACS714 Hall effect-based linear current sensor. This version accepts a bidirectional current input...
1 item(s)
End of line

Customers also bought....

3801-202
£8.01 £4.01 (£4.81 UK, incl VAT)
3801-202
This board is a simple carrier for Allegro's ±30A ACS714 Hall effect-based linear current sensor. This version accepts a bidirectional current input...
1 item(s)
End of line

2110-062
£8.48 £4.24 (£5.09 UK, incl VAT)
2110-062
These encapsulated laser diodes are Class IIIa 5mW, with a 650nm red wavelength. They can be driven from 2.8V to 5.2V so they're great for your embedded...
1 item(s)
End of line

1208-002
£0.17 (£0.20 UK, incl VAT)
1208-002
16A Interlocking Terminal Block 2-Way These 16A 250V terminal blocks on a 5mm pitch (0.2") can be interlocked together to make even longer blocks. Max...
In stock

1134-001
£6.86 (£8.23 UK, incl VAT)
1134-001
These premium wires are stranded 26AWG wires with female terminals on both ends. Together with our 0.1" crimp connector housings, these wires can be used to...
In stock

2702-001
£0.97 (£1.16 UK, incl VAT)
2702-001
Along with the matching pre-crimped wires, you can now make your own cable assemblies for your projects. The pre-crimped wires are available in various...
In stock