The datasheet for the 16F687ML in the 20 pin QFN package shows an exposed metal pad on the bottom of the chip, but does not, as far as I can tell, show what that pad connects to. Is it Vss? Something else? Thanks! Harold -- FCC Rules Updated Daily at http://www.hallikainen.com - Advertising opportunities available! -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist