ACS724 Current Sensor Carrier 0A to 5A

This board is a simple carrier of Allegro’s unidirectional 5A ACS724LLCTR- 05AU 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.

AUD$ 10.95

Special Order  

Shipping from $7.90

+249 more from our supplier in 7-10 days

Our Code: SKU-010138

Supplier Link: [Pololu MPN:4048]


Description

Overview

ACS724 current sensor carrier, bottom view with dimensions.

This current sensor is a carrier board or breakout board for Allegro’s ACS724LLCTR Hall effect-based linear current sensors; we therefore recommend careful reading of the ACS724 datasheet (2MB pdf) before using this product. The following list details some of the sensor’s key features:

  • Differential Hall sensing rejects common-mode fields, so the orientation of the sensor relative to uniform external magnetic fields (e.g. 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 module.
  • 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.
  • Optional FILTER pin simplifies bandwidth limiting for better noise reduction and improved resolution at lower frequencies.
  • 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 labelled 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.

A variety of options are available with different current sensing ranges and sensitivities:

ACS724 Current Sensor Carriers
Sensitivity(1) Unidirectional range Bidirectional range
800 mV/A 0A to 5A -2.5A to +2.5A
400 mV/A 0A to 10A -5A to +5A
200 mV/A 0A to 20A -10A to +10A
133 mV/A 0A to 30A
100 mV/A -20A to +20A
66 mV/A -30A to +30A
40 mV/A -50A to +50A
1 Sensitivity shown for Vcc = 5V.

These versions all look very similar, and while you can distinguish them by reading the text on the IC, we also provide a white box on the bottom silkscreen where you can add your own distinguishing markings if so desired.

Details for item #4048

ACS724 Current Sensor Carrier 0A to 5A, top view.

ACS724 Current Sensor Carrier 0A to 5A with included 0.1″ header pins.

This carrier features the ACS724LLCTR-05AU-T, which operates at 5 V and is designed for unidirectional input current from 0 A to 5 A. When Vcc is 5 V, the output voltage is offset by 500 mV and increases by 800 mV per amp of input current.

This board ships assembled with all surface mount components, and a 3×1 strip of 0.1″ header pins is included but not soldered in.

Using the sensor

ACS724 Current Sensor Carrier pinout.

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 labelled on the bottom silkscreen, and the sensor outputs an analogue voltage that is linearly proportional to the input current.

The FILTER pin lets you adjust the board’s bandwidth by adding a capacitor 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 an added external filter capacitor, the bandwidth is about 90 kHz. The datasheet provides more information on how the filter capacitors affect 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.

ACS7x4/ACHS-712x Current Sensor Carrier soldered with high-current wires.

ACS7x4/ACHS-712x current sensor carrier with solderless ring terminal connectors (not included).

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.

Schematic and dimension diagrams

Schematic diagram of the ACS724 Current Sensor Carrier.

The dimension diagram is available as a downloadable PDF (323k pdf).

Comparison of the Pololu current sensor carriers

We have a variety of current sensors available with different ranges, sensitivities, and features. You can use the following table to compare our options:


ACS709 Current
Sensor Carrier

ACS711EX Current
Sensor Carriers

ACS714 Current
Sensor Carriers

ACS724 CurrentSensor Carriers

ACHS-712x CurrentSensor Carriers
Sensor IC: ACS709 ACS711EX ACS714 ACS724 ACHS-712x
Current range / sensitivity(1): ±75 A / 28 mV/A ±15.5 A / 136 mV/A
±31 A / 68 mV/A
±5 A / 185 mV/A
±30 A / 66 mV/A
0–⁠10 A / 400 mv/A
0–⁠30 A / 133 mV/A
±5 A / 400 mV/A
±20 A / 100 mV/A
±50 A / 40 mV/A
±10 A / 185 mV/A
±20 A / 100 mV/A
±30 A / 66 mV/A
±40 A / 50 mV/A
±50 A / 40 mV/A
Path resistance: 1.1 mΩ 0.6 mΩ 1.2 mΩ 1.2 mΩ 0.7 mΩ
Bandwidth 120 kHz 100 kHz 80 kHz 120 kHz 80 kHz
Vcc range:(1) 3 V–5.5 V 3 V–5.5 V 4.5 V–5.5 V 4.5 V–5.5 V 4.5 V–5.5 V
Size: 0.82″ × 0.9″ 0.7″ × 0.8″ 0.7″ × 0.8″ 0.7″ × 0.8″ 0.7″ × 0.8″
Special features: configurable
over-current threshold,
low-voltage operation,
high bandwidth
over-current fault pin,
low-voltage operation
Differential Hall sensing
rejects common-mode fields,
high bandwidth
1-piece price: $14.95 $3.95 $19.95 $11.95 $6.95
1 Sensitivity based on when Vcc is 5V.

Specifications

Dimensions

Size: 0.7" x 0.8"
Weight: 1.1 g

General specifications

Current sense: 0.800 V/A1
Minimum logic voltage: 4.5 V
Maximum logic voltage: 5.5 V
Supply current: 14 mA2
Version: 0 to 5A (unidirectional 5A)
Current sensor: Allegro ACS724LLCTR-05AU

Identifying markings

PCB dev codes: cs01a
Other PCB markings: 0J1214, blank white box

Notes:

1
When Vcc is 5 V.
2
Max. 10 mA typical.

Resources

File downloads

Related Products