Single ended input reference for SAR set as Differential Inputs

DaHu_285096 · ‎Oct 16, 2019

I have a project with 2 x Differential analog input requirement and 2 x Single ended analog input.

The SAR SEQ component is set up as differential input with internal reference for the differential inputs ok.

What is usually done to set the second input for the single ended measurement? I tried connecting to VSSA ref but the program cmplained about vdac output not connected for some reason.

I don't suppose I could put a couple of Digital LOW components on those pins to reference to ground?

Really don't want to waste 2 IO pins to get ground refs.

Thanks

Len_CONSULTRON · ‎Oct 17, 2019

DaHu,

You can use GrC recommendation but you would have to use a SAR + a mux where you control the mux in your code.

The SEQ SAR as BrRu indicated provides compile/build errors when you connect the inputs to anything but a analog pin.

Len

Len
"Engineering is an Art. The Art of Compromise."

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Single ended input reference for SAR set as Differential Inputs

Single ended input reference for SAR set as Differential Inputs

Re: Single ended input reference for SAR set as Differential Inputs