In SX Microcontrollers, SX/B Compiler and SX-Key Tool, sylvie369 wrote:

Okay, I got an SX-Key in the daily deal, and a couple of SX-28 DIP chips. I thought I could use the SX-Key to program the chips in a breadboard, but it's not working as I'd hoped. I'm getting a "Vpp generation failure" each time I try to program the chip. In addition, the SX-Key gets hot. 
 

First question: am I wrong in my assumption that this can work? 

 

If not, then here's what I've got (see photo): 

 

A wire from OSC1 of the SX-Key to pin 27 of the SX 28. 

A wire from OSC2 of the SX-Key to pin 26 of the SX 28

A wire from VSS on the SX-Key to pin 4 of the SX 28

A wire from pin 2 of the SX 28 to pin 28 of the SX 28. 

(I have also tried this with a 10K resistor from pin 28 to Vcc instead, with the same results)

 

I have a 5V breadboard supply, +5V going into pin 2 of the SX 28, ground going into pin 4 of the SX 28. I have checked the supply, and I am getting 5V. I have traded it out with another 5V supply (from a Stamp protoboard) with the same results. 

 

As I understand it, a Vpp generation failure refers to the inability to generate the voltage needed for programming. Is this perhaps just inadequate power supply?

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=365097

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)