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TMS320F28379D: 176Pin Package Exposed Pad

Part Number: TMS320F28379D

I am working on hardware design with TMS320F28379DPTPS, I dont have a actual part on hand, I would like to know the actual size of the exposed pad. The drawing show the pad size is about 8 mm by 8 mm,  and the recommended pcb pad size on top layer is about 22mm X 22 mm,  do I have to use this big pad for this micro controller?  Anyone has an actual picture of this part? Thanks.