SX "Vpp generation failed"

Bobb Fwed

I am brand new to the SX key, but have been using the BS2 chip for a while. I bought an SX-Blitz, Tech board, a couple oscillators, and a few SX28s.

The first couple times I tried programming the chip is seemed to work, but I wasn't able to get it do do anything like I want. Now when I try to program the chip it gives me "Vpp generation failed". I double checked that there is no bent pins on the chip, and the chip is in the right direction; the incoming (into the board...then there is a regulator) voltage is 8.05V from a regulated power supply which can provide up to 10 amps.

Does the type of USB cord connected to the Blitz affect how it works. I have a relatively standard USB to USB-mini cable. But I have noticed that one of the orange components on the Blitz looks blackened, wondering if it normally looks like that.

I am using the software SX-Key v. 3.2.3 on Windows Vista.

Guenther Daubach

To program or erase an SX chip, it is necessary that a voltage of about 12 Volt (the so-called "Vpp") is applied to the OSC1 pin. The SX-Blitz has an on-board voltage converter to generate this voltage. When the IDE reports the "Vpp generation failed" error, this voltage could not be established in a certain period of time. Possible reasons are:

- Additional load on the OSC1 pin caused by external components connected, e.g. an external clock generator
- Supply voltage too low (should be 5 Volt for the SX-Blitz) and/or not stabilized
- Defective SX device with a short on the OSC1 pin
- Defective SX-Key/SX-Blitz

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Greetings from Germany,

G

Bobb Fwed

Thanks for the info. Based on what I saw, I am pretty sure it is the Blitz I had. I have already got an RMA and am sending it back.