Electronic – Reverse polarity protection on AD623 inputs used to measure low voltages on a sense resistor

current measurementinstrumentation-amplifierreverse-polarity

This circuit used to measure low voltages on a sense resistor is part of my current meter in arduino that measures currents from 0.005ma to 5A.

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I configure the gain of the instrumentation amplifier with a value of 100.

On the sense resistor the min voltage on its terminals is 0.00005v and max voltage 0.05v.

Actually I have the circuit working ok but I need is a way of reverse polarity protection on the inputs of AD623 to protect for example if I connect the wrong way the inputs to measure current on a Li-Po battery.

Is there a way to get that protection and keep the accuracy of the circuit?

Best Answer

The data sheet advises this: -

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So personally I'd use resistors in series with each input just to be 100% certain that even unreasonable voltage levels on the shunt resistor are catered for.

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