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'[SX] "Chip connection Failed"'
2006\05\11@203906 by Mag748n/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Mag748 wrote:

I receive this error now whenever I try to download anything to my SX28. What does this mean?

Also, how do I connect a resonator to the SX without the SX Tech board?

Thanks,
Marcus
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2006\05\11@204439 by Peter Van der Zeen/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi Mag748;
The most common reason for that type of message is a bad connector on your SX-Key.

It happens to me frequently, and I just jiggle the thing side to side, then usually all is well again.

On occasion the IDE program locks up, then I need to close and re-open it, and all is well.


Cheers,
Peter (pjv)
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2006\05\11@233831 by Mag748n/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Mag748 wrote:

I have 2 SX28 chips and it only happens with one of them. I think its a problem with the chip. I was wondering if any techies knew what was wrong with the chip itself. Maybe a bad eeprom? dont know.
Thanks pjv.

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2006\05\12@074027 by beann/a

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

If it's a bad chip, it's a bad chip. It really doesn't make sense to troubleshoot a $4 chip. Just chuck it.
Bean.

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2006\05\12@075816 by Mag748n/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Mag748 wrote:

Ok. Now where can I find an answer to the second question?

Thanks,
Marcus
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2006\05\12@094748 by Forrestn/a

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

>>Also, how do I connect a resonator to the SX without the SX Tech board?<<
Solder works well
 :-)
If you want a better answer, then you'll need to refine your question.

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2006\05\12@180332 by Mag748n/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Mag748 wrote:

Sorry. Here is a better explanation.

I have a 3 pin 20 MHz resonator (it's a little tan blobby thing with three pins coming out of the bottom). I put it in the socket on the SX Tech board and it works fine. Now I want to transfer this to a perf board. Right now I have the leftmost pin connected to pin 26 on the SX and the right most pin connected to pin 27 on the SX. And the middle pin of the resonator is connected to ground. Is this correct? And also, does the MCLR pin have to be connected to anything with this set up?

Thank you,
Marcus.

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2006\05\12@183001 by beann/a

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

Sounds like you have the resonator connected correctly.

You MAY (or may not) need a resistor across the outermost pins of the resonator. It usually works without a resistor, but it is recommended.

The MCLR pin must be connected to Vcc with a 10K resistor.

You should also use one of the brown-out-reset settings on the device line of your program. BOR42 if you are using 5volts.

Bean.

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2006\05\13@130043 by Mag748n/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Mag748 wrote:

One more thing, I noticed large capacitors on the BOE next to the power input. Are these for filtering purposes? and should I have any on my perf board?
Thank you,
Marcus
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2006\05\13@134827 by Forrestn/a

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

Those capacitors are required if you're using a voltage regulator such as the 7805 or 2940-5. Check the voltage regulator data sheet for recommended capacitor types and values.

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2006\05\17@204918 by holdsthechainsn/a

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

I had this problem recently.

Don't throw anything out without trying a fresh battery if you're using a battery powered device.

I almost ruined my SX-key trying to figure out what was wrong.

Also, turn down (off) the fifo buffers on the comport uart.

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'[SX] sx48 and a "vpp generation failed" '
2006\12\18@091518 by Johnson Rodn/a
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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Johnson Rod wrote:

i checked out a previous thread http://forums.parallax.com/forums/default.aspx?f=7&m=139996&g=140150#m140150 my +5vdc seems fine, my header is identical to serveral other successful projects, and my xtal is very close to the mcu.

pin2 is connected to osc1 and pin3 to osc2 on the sx-key.

when i looked up http://www.parallax.com/dl/docs/prod/datast/SX48BD-Data-v1.5.pdf for the pin assignments i noticed that i may have soldered the sx48 upside down.

con some confirm?

ps the flash made my solder job look much worse than it is and i've already tested the device for solder bridges.

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2006\12\19@172638 by Sparks-R-Funn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Sparks-R-Fun wrote:

Nick,
  I'll confirm it for you.  You need to position your chip 90 degree clockwise from how you have it shown.  I confirmed this by examining an SX48 protoboard in addition to the document you referenced.  When positioned with the text upright (as you have it shown) the oscillator pins will be found at the bottom edge of the chip.  But the text is not what you should use as a reference.  Use the dot for proper alignment rather than the text.  The dot is your friend!  It should be positioned in the upper left hand corner for the board orientation you have shown.

  Also, it is good practice to connect ALL of the power pins.  Multiple pins are provided for good electrical performance which includes allowing for the rated amount of current to flow through those tiny pins.  It is possible that your circuit will work just fine without all of them being connected.   Just keep in mind that whenever possible it is a good idea to connect them.

- Sparks
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2006\12\22@093241 by Johnson Rodn/a

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

thx sparks, i incorrectly assumed the logo and text was gospel. oops
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'[SX] PDB "Vpp Generation Failed" questio'
2008\02\07@114422 by johncouturen/a
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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, johncouture wrote:

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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2008\02\07@115628 by dandreae1n/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, dandreae1 wrote:

Can you add a picture of your set up so that we can see your board?


Thanks,

Dave
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2008\02\07@120501 by beann/a

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

Did any of the SX pins get bent when inserting it ?

Try another SX28 chip in the PDB.

Bean.

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2008\02\07@120858 by johncouturen/a

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

Bean, All pins ok.

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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2008\02\07@121357 by johncouturen/a

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

Bean, just inserted a new chip.  Seems to be ok.  Thus, throw out old chip?

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2008\02\08@060020 by beann/a

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

John,
 It would seem that it is toast.

 Instead of throwing it away it might be worth trying to carefully sanding 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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2008\02\08@101430 by Shawn Lowen/a

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

Thats a good idea, bean!

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2008\02\11@133522 by johncouturen/a

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

Thanks Bean!  Lucky I bought extras!

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'[SX] SX "Vpp generation failed"'
2008\04\07@145810 by bobbfwedn/a
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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bobbfwed wrote:

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.

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2008\04\08@095225 by g_daubachn/a

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

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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2008\04\08@194525 by bobbfwedn/a

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

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.

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