PDB "Vpp Generation Failed" question
John Couture
Posts: 370
Before bothering tech support, I figured I'd ask here.
I'm teaching a class using the SX and the Professional Dev Boards.· We seem to be having trouble with a couple of components.
New PDB used by student.· He keeps getting "Vpp Generation Failed".· If I remember correctly from previous discussions, this means that the Key or Blitz cannot get the higher voltage to the chip to erase and program it. Here's what I tried:
1) Numbered the boards so that I can track problems in the future
2) PDB # 8001 give me "Vpp Generation Failed" when used with both an SX-Key (with USB converter) and an SX-Blitz.· Using 4mhz resonator.
I think I have narrowed it down to the PDB because:
3) When I use thet same SX-Key with another board, the key·works fine.
4) When I use the same SX-Key with another board, the blitz works fine.
5) When I changed the power supply from a 7.5Vdc to 9.8Vdc, I still get the Vpp error.
Did I miss something?
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John J. Couture
San Diego Miramar College
I'm teaching a class using the SX and the Professional Dev Boards.· We seem to be having trouble with a couple of components.
New PDB used by student.· He keeps getting "Vpp Generation Failed".· If I remember correctly from previous discussions, this means that the Key or Blitz cannot get the higher voltage to the chip to erase and program it. Here's what I tried:
1) Numbered the boards so that I can track problems in the future
2) PDB # 8001 give me "Vpp Generation Failed" when used with both an SX-Key (with USB converter) and an SX-Blitz.· Using 4mhz resonator.
I think I have narrowed it down to the PDB because:
3) When I use thet same SX-Key with another board, the key·works fine.
4) When I use the same SX-Key with another board, the blitz works fine.
5) When I changed the power supply from a 7.5Vdc to 9.8Vdc, I still get the Vpp error.
Did I miss something?
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John J. Couture
San Diego Miramar College
Comments
Thanks,
Dave
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Dave Andreae
Parallax Tech Support·
Try another SX28 chip in the PDB.
Bean.
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Dave, no setup (i.e. no wires attached), I purposely wanted to try a blank Prof Dev Board so as to not muddy up the problem.
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John J. Couture
San Diego Miramar College
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John J. Couture
San Diego Miramar College
It would seem that it is toast.
Instead of throwing it away it might be worth trying to carefully sanding/filing/grinding down the top to expose the die. The students will get a kick out of seeing what is actually inside the chip.
Bean.
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Shawn Lowe
Maybe I should have waited to do that......
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John J. Couture
San Diego Miramar College