In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote: I run alot of mine at 3.3V and never have had a problem programming them. I assume you have the USB version of the SX-Key ? The serial version does need 5.0V to program. Bean. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=410638#m410709 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2009 (http://www.dotNetBB.com)