In the Optiga Trust M datasheet, the exposed centre pad is labelled as n.c. but with the following comment

Connect the exposed pad with the copper area in the PCB to improve thermal dissipation.

Can this pad be connected to ground? or must any connection be floating?

thanks in advance

Hello,

I use Optiga Trust M Eval Kit to integrate Optiga Trust M in our product. We use the following example: 

https://github.com/Infineon/optiga-trust-m/blob/develop/examples/utilities/authenticate_chip/example_authenticate_chip.c

We observed that pal_crypt_verify_signature independently of Keys, Digest and Signature delivers return code 0xB380. This return code we cannot decrpyt according to the existing return codes. 
The return code is independent of the input data. We used input data from example_optiga_crypt_ecdsa_verify.c as well as python-generated random data. 

Please, explain why pal_crypt_verify_signature fails.

Best regards,