Xeltek Programming Adaptor: S680 - 64-pin QFP to 100-pin PEP3000 Connector The Xeltek S680 is a Programming Adaptor which converts a device in QFP64 package to the 100-pin PEP3000 Connector. This adaptor only works with the 3000U programmer and requires that the PEP3000 adaptor is already fitted to the programmer.