344041 4041 - ACS724 Current Sensor Carrier -5A to +5A

This board is a simple carrier of Allegro’s bidirectional ±5A ACS724LLCTR-05AB Hall effect-based linear current sensor, which offers a low-resistance (~1.2 mΩ) current path and electrical isolation up to 2.4 kV RMS. This version accepts a bidirectional current input with a magnitude up to 5 A and outputs a proportional analog voltage (400 mV/A) centered at 2.5 V with a typical error of ±1.5%. It operates from 4.5 V to 5.5 V and is intended for use in 5 V systems.

This current sensor is a carrier board or breakout board for Allegro’s ACS724 Hall effect-based linear current sensors; we therefore recommend careful reading of the ACS724 datasheet (1MB pdf) before using this product. The following list details some of the sensor’s key features:

• Differential Hall sensing rejects common-mode fields, the orientation of the sensor relative to the Earth’s magnetic field does not affect the measurement
• The 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 2.4 kV RMS), which allows the sensor to be inserted anywhere along the current path and to be used in applications that require electrical isolation.
• High 120 kHz bandwidth for faster response times in control applications.
• Filter pin allows user to filter the output for improved resolution at lower bandwidth.
• Integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor.
• 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.

Using the sensor

This sensor has five required connections: the input current (IP+ and IP-), logic power (VCC and GND), and the sensor output (OUT).

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, and the sensor outputs an analog voltage that is linearly proportional to the input current.

The FILTER pin lets you adjust the board’s bandwidth by adding a capacitor, C_F, to ground (a ground pad has been added next to the FILTER pin for convenience) in parallel with the 1 nF capacitor that is already on the board. Without any external filter capacitor, the bandwidth is 120 kHz. The datasheet provides more information on how the external filter capacitor affects bandwidth.

You can insert the board into your current path in a variety of ways. For low-current applications, you can solder 0.1″ male header pins to the board via the smallest pair of through-holes on the input-current side of the board. For higher-current applications, you can solder wires directly to the through-holes that best match your wires, or you can use solderless ring terminal connectors. The largest pair of through-holes are big enough for #6 screws.

Warning: This product is intended for use below 30 V. Working with higher voltages can be extremely dangerous and should only be attempted by qualified individuals with appropriate equipment and protective gear.

Dimensions

General specifications

Identifying markings

Notes:

1 When Vcc is 5 V.

2 Max. 10 mA typical.

File downloads

Allegro ACS724 current sensor datasheet (1MB pdf)

Dimension diagram of the ACS7x4 Current Sensor Carriers (323k pdf)

3D model of the ACS7x4 Current Sensor Carriers (3MB step)

Drill guide for ACS7x4/ACS715 Current Sensor Carriers (42k dxf)

This DXF drawing shows the locations of all of the board’s holes.