Sensor – ACS712 – Stroommeter

Hardware

Stroommeter DC 20A ACS712_gy712

BESTELLEN

Informatie (ENG)

The Allegro ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. The device is not intended for automotive applications.

The device consists of a precise, low-offset, linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy after packaging.

The output of the device has a positive slope (>VIOUT(Q)) when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. The internal resistance of this conductive path is 1.2 m? typical, providing low power loss. The thickness of the copper conductor allows survival of the device at up to 5× overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor IC leads (pins 5 through 8). This allows the ACS712 current sensor IC to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.

The ACS712 is provided in a small, surface mount SOIC8 package. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.

Top Features

  • Low-noise analog signal path
  • Device bandwidth is set via the new FILTER pin
  • 5 µs output rise time in response to step input current
  • 80 kHz bandwidth
  • Total output error 1.5% at TA = 25°C
  • Small footprint, low-profile SOIC8 package
  • 1.2 m? internal conductor resistance
  • 2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8
  • 5.0 V, single supply operation
  • 66 to 185 mV/A output sensitivity
  • Output voltage proportional to AC or DC currents
  • Factory-trimmed for accuracy
  • Extremely stable output offset voltage
  • Nearly zero magnetic hysteresis
  • Ratiometric output from supply voltage

acs712 uitleg

ACS712 chip:

acs712 chip

Pinout

Pin:Functie:
+5v+5V
OUTDATA
GNDGND

Arduino

Sluit de module aan volgens onderstaand overzicht:

 

Stroommeter DC 20A ACS712_gy712 arduino schema

Arduino Pin:ACS712 Pin:
+5v+5V
A0DATA
GNDGND

Script #1

Sluit de stroommeter module aan zoals hierboven aangegeven.

Resultaat seriële monitor:

Script #2

Dit script maakt geen gemiddelde waarden en komt wat zenuwachtiger over…

Sluit de stroommeter module aan zoals hierboven aangegeven.

Het resultaat

Stroommeter DC 20A ACS712_gy712 console output

Script #3

Dit script maakt gebruik van een speciale “filters” bibliotheek om waarden uit sinus waarden te berekenen…

Filters-master

Bronnen:
microcontroller-project.com

Schema

Afmetingen

GEEN GEGEVENS

Teardown

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Datasheet

Fritzing

Downloads

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