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4-20mA receiver

Pablo Cottens
Genius 3020 points
Other Parts Discussed in Thread: RCV420, OPA333

Hello,

I'm creating an application for process control. The other day the person in charge of the project told me that the control module must receive information from sensors that send information in 4-20mA instead of 0-5V, and I've never done anything like that.

I was wondering: Is the RCV420 the only thing necessary to receive information from those sensors? Do you recommend any other ICs? To tell you the truth I'm completely lost here.

PS: The RCV420 would interface with an MSP430 microcontroller and then send the information to a RaspBerry Pi via ModBus.

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    TI__Guru 62935 points

    Hello Pablo,

    The RCV420 is the only completely integrated solution that we have to offer for 4-20mA receivers.  However if you only need one receiver per loop then the circuit can be constructed with a good tolerance, low-TC shunt resistor and a precision op-amp such as the OPA333 which could share the same power-supply as the MSP430.  Here is an example of such a circuit.  This would have to slightly modified for +3.3V operation by lowering the resistance from 250 Ohms to say 100 Ohms or so.

    4130.4-20mA_Receiver.TSC

    Hope this helps!