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Detection awaken Delta 1 - ST25R3916B

ignacio
Associate II

Hello,

I would like to go a bit deep in the inductive wake up function. Unfortunatly seems that i will need to work with delta 1 at least for the moment, but due that it is a battery powered device i need to avoid as much as fake awake when there is no RFID card in front.

1) Im playing with your 3916B Discovery kit connected to  my antena instead ST antena board, and im seeing for example that on phase awaken, mostly of the “fakes” are values under the reference, like i set as reference 120 and fake shows a value of 119, never 121. Is that realistic to say that fakes will follow that logic? Or it is just coincidence…

2) Has ST any statistics about behaviour with Delta 1?

3) In addition, my feeling is that Just rebooting sometimes the reference is taken for example as 120 and sometimes in a range of 140. i think im not modifying anything. Any idea about why this could be? I mean, is normal to read such different values as reference? Im using Discovery firmware, with no modification.

4) Is is possible to set awaken with delta 1 but only +1 not –1?

5) is it possible to configure the transceiver to trigger the interrupt not at the first delta 1 detection and to do it for example after 3 times in a specific time range?

6) Is it ok to use Amplitud and phase awaken at same time? Or this could trigger me other problems

7) any idea of how to minimizate this fake awakes?

 

Any help will be higly apreciated, thanks!!

 

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