MSP430F47197: How to increase Sigma-Delta ADC full-scale voltage

Hello Neeraj,

Thanks for your detailed post and detailed title. It really helps our community find similar questions they may have.

Neeraj sharma said:

I am using Msp430F47197 for MCCB application, the full-scale voltage of all ADC channels is +-500 mV

That's correct.

Neeraj sharma said:

In my application, I need ADC full-scale voltage up to 1.0Volt/1000mV, required for RMS current measurement up-to 1000Amps

What current sensor are you using? Current transformer? Shunt?

Neeraj sharma said:

Is it possible to increase sigma-delta ADC Input full-scale voltage??

If Yes, How can I achieve it in MSP430F47197 MCU via Internal or External ref.?

Yes, but slightly. Instead, I would recommend sizing your current sensor or its related components to stay within the full-scale range (FSR). Better yet, why don't you consider using the MSP430F6779A with the Energy Measurement Design Center and software library? The F6779A has a full-scale range of +/-940 mV with the internal voltage reference.

If you want to use an external reference, you can refer to the equation in the datasheet near the ADC performance section and re-calculate the FSR.

Regards,

James