For those who are curious about the internals of the SI570, the following patent looks like the blue print of this chip: 73, Guido PE1NNZ
[1] Silicon Laboratories Inc., Patent 7288998, http://www.google.com/patents?id=CK6RAAAAEBAJ&dq=7288998
For those who are curious about the internals of the SI570, the following patent looks like the blue print of this chip: 73, Guido PE1NNZ
[1] Silicon Laboratories Inc., Patent 7288998, http://www.google.com/patents?id=CK6RAAAAEBAJ&dq=7288998