Sparkfun Electronics

ACS712 Low Current Sensor Breakout

Regular price $15.12
  • Precise current measurement for both AC and DC signals
  • Device bandwidth is set via the new FILTER pin
  • Ratiometric output from supply voltage
  • Low-noise analog signal path
  • RoHS Compliant

The SFE ACS712 Low Current Sensor Breakout gives precise current measurement for both AC and DC signals. These are good sensors for metering and measuring overall power consumption of systems. The ACS712 current sensor measures up to 5A of DC or AC current. An opamp gain stage is also added for more sensitive current measurements. By adjusting the gain (from 4.27 to 47) you can also measure very small currents.

The ACS712 Low Current Sensor Breakout outputs an analog voltage that varies linearly with sensed current. To calibrate, first set the output offset to the desired level with zero current on the sense lines, read output with a DVM. Then with a known current input a 100mA limited supply works well for this, set the output deflection with the gain pot. The Sensitivity is then calculated as (Vref - Vdeflect)/(current input). The bandwidth on the ASC712 Low Current Sensor Breakout has been set to 34Hz to reduce noise when using at high gains. The full 80KHz bandwidth that the sensor is capable of can be recovered by removing C1.

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 Omega 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

Applications:

  • Motor control
  • Load detection and management
  • Switched-mode power supplies
  • Over current fault protection

Vendor Product Code: SEN-08883

Documentation:


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