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I have a 6 input analog multiplexer connected to a 12Bit SAR ADC on a PSoC5LP. I want to connect one of the Mux inputs to the internal analog ground of the PSoC5LP in order to get a 0V offset reading through the Mux. How can I achieve this.
I know I can use a pin connected to 0V on the outside, but the PCB is already made, so it is not an option.
Any suggestions how such a routing can be achieved will be welcome.