Spudmn's Puma board build

Post by **Fred** » Tue Mar 15, 2011 8:38 am

Fred wrote:Don't "nah" me... how rude!

nitrousnrg wrote:Ooh, you only have the cpu.

Can you get a 16MHz SMD crystal and the 0805 stuff?

Are you going to apologise? Or just ignore what you did?

nitrousnrg · Post by **nitrousnrg** » Tue Mar 15, 2011 3:15 pm

Fred wrote:Are you going to apologise? Or just ignore what you did?

Nah :p I thought you were kidding, 'nah' is not rude at all from where I come. Sorry for the inconvenience.

Spudmn · Post by **Spudmn** » Wed Mar 16, 2011 3:11 am

Marcos

What components should I use on the PLL.

The BOM says 3.3nf 330pF and 3.9K

Your notes on the schematic say 27nf 2.2 nf and 1K

nitrousnrg · Post by **nitrousnrg** » Wed Mar 16, 2011 3:31 am

All my boards used:

3.3nF
220pF
3.3kohm

I didn't had the correct values to build the PLL as I wanted (with a sligthy tighter bandwith)

Spudmn · Post by **Spudmn** » Mon Mar 21, 2011 8:39 pm

Finally found some time to get back to my Puma build.

Marcos How accurate to I need to be with the PLL components. There are now 3 different combinations of components for this part of the circuit.

I am having trouble finding a 3.3nf but I do have a 2.2nf, Will this do?

nitrousnrg · Post by **nitrousnrg** » Mon Mar 21, 2011 10:10 pm

Check the datasheet, page 1271. The datasheet itself did a fairly rough approximation, so you'll be fine.

The other capacitor will have to be between:

2.2nF / 20 and 2.2nF /10

Spudmn · Post by **Spudmn** » Tue Mar 22, 2011 8:33 pm

OK I have a 2n2 for C93 and a 220pF for C94 but I am having trouble trying to work out what R175 should be now.

Can anyone help?

nitrousnrg · Post by **nitrousnrg** » Tue Mar 22, 2011 10:35 pm

6.8kOhm will be fine. You'll have a loop bandwidth of 30khz instead of 20khz, which is no big difference :-)

Spudmn · Post by **Spudmn** » Wed Mar 23, 2011 12:27 am

Thanks

Spudmn · Post by **Spudmn** » Sun Mar 27, 2011 8:17 pm

I now have the Micro soldered on and I am putting together a temporary RS232 interface.

Marcos. there is a Cap C? Near the BDM. Do I need to put this on?

Fred. I can get a Win Laptop. What software should I but on it?

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