Can't use V5 analog in PGA mode

Demo code shows a V5 mode for Analog in, using 2x PGA of  MCP3424 chip.

But this mode can't be used due to the configuration of the analog input stage, which has the zero at 5V.

So 10V corresponds to -5 to +5.

In the 5V range, what we get is -2.5 to 2.5V, which corresponds to 2.5 to 7.5V related to ground.

In order to use the PGA function, something should be changed in the design.

The only valid use I can see is in the case of a weathstone bridge, or a resistive sensor in a divider.

In this case, could we also add x4 and x8 ranges?

I looked at the library and it is just a matter of listing.

Stefano Giuseppe Bonvini
Stefano Giuseppe Bonvini
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Asked on 10/28/20, 12:08 PM

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Asked: 10/28/20, 12:08 PM
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Last updated: 10/28/20, 12:08 PM