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low side current sensing 4mA to 20mA

khoulod ghanem
Prodigy 20 points
Other Parts Discussed in Thread: RCV420

I want to measure a high accurate current range from 4mA to 20 mA by using Arduino Uno which has ADC 10 bits. Is RCV420 precise enough to get the exact current value from my Arduino.
I appreciate any help

  • 0
    TI__Guru 62085 points
    Hello Khoulod,

    Yes, the RCV420 will pair well with 10 and 12 bit converters. The typical gain and offset errors are < 0.05% of the full-scale value which is likely similar to the performance of the ADC in the Arduino.
  • 0 in reply to Collin Wells
    Prodigy 20 points

    Hi Collin,
    I have bought the IC and I want to test .... First, I want to protect it from current above 20mA shall I follow this instructions :
    www.ti.com/.../sbva003.pdf
    Second, I want to test it but the power supply I have has a minimum 100mA ..... I want to use a current divider to down the current to 1mA
    is that possible and how to design the current divider ??
    I will appreciate any help

    Best regards,

  • 0 in reply to khoulod ghanem
    TI__Guru 62085 points

    Hello,

    The circuit you referenced provides an effective way to prevent damage from high current flow through the RCV420.  I'm not sure what you mean about your power supply.  It sounds like you have a 100mA current limit on your power supply, try connecting the power-supply to the RCV420 and see what happens.  I don't think you'll need a current divider as suggested.