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TSS721A application circuit

Other Parts Discussed in Thread: TSS721A

Hi;

I want to ask some questions about the application circuits of the TSS721A meter bus IC:

We are using TSS721A  in a Remote supply/Battery support configuration (figure 9 on slas222.pdf )On slas222.pdf of TSS721A,it is given that an application circuit of

TSS721A from a battery:

It is told that CSTC : CVDD >=4:1 should be met.Does this condition have to be satisfied for other application circuits?What happens if it is chosen improper?

Other question is:What  does "single load 1UL" and  "double load 2UL" stands for?

My last question is :Is it possible to use FND338P instead of BSS84 for Remote supply/Battery support configuration?

Thanks

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