I am working on a circuit to convert 4-20 mA signal to 0-5 V to finnaly read with an analog input of an MCU (PIC16F886). The IC I'm using to convert the signal is the RCV420K which works fine. On the documentation of the IC it says that it needs to have -1.25 V on the output at 0 mA so at 4 mA can be 0 V. I am reading the voltage signal with no problems but when I unplug the signal from the IC the voltage goes negative and I suspect it is going to be harmful for the MCU.
The thing is the IC outputs very little current (0.10 mA on my readings) but when the signal source is removed it reads -1.0 mA. Is this safe for my MCU? If not, Is there any way to ground the negative signal so it doesn't affect the MCU?
Thanks in advance!! I'll attach an schematic.