two rings surrounding thermal pad of CY8C20434-12LKXI (32 QFN)

Question: There are two rings surrounding the thermal pad on the bottom of the chip. Is it safe if they are all connected together (soldered in manufacturing)?

 

Answer:

Yes, they can all be connected. In fact, they are connected internally. The reason Amkor, our package supplier, makes them that way is for bonding and stress relief purposes.