Re:pncconf - feature requests

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14 years 2 months ago #22833 by cmorley
Replied by cmorley on topic Re:pncconf - feature requests
hmm my art got screwed up - i think i get it anyways. thanks

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14 years 2 months ago - 14 years 2 months ago #22834 by PCW
Replied by PCW on topic Re:pncconf - feature requests
3.3V
/
\
/
\
/ <
ANALOG IN
\
/
GND

Ha had to find out how to escape the backslashes...
Last edit: 14 years 2 months ago by PCW.

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14 years 2 months ago #22835 by cmorley
Replied by cmorley on topic Re:pncconf - feature requests
you jedi powers are strong :) thanks

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13 years 11 months ago - 13 years 11 months ago #26992 by Psykhon
Replied by Psykhon on topic Suggestion
I have been having some issues with 5i25 and G540. It turns out that timing parameters are too tight in pncconf and with a small increase, everything is smoth, here are the minimun values that works:
Code:
DIRSETUP = 250 DIRHOLD = 250 STEPLEN = 1100 STEPSPACE = 2100

So my suggestion is if this can be taken as defaults in pncconf when a 5i25 and G540 combo is selected

Regards
Last edit: 13 years 11 months ago by Psykhon. Reason: typo

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13 years 11 months ago #26994 by Psykhon
Replied by Psykhon on topic Suggestion
in this post you can see how I made the 5i25 generate the charge pump for G540 with losts of help from PCW, I guess this will also be a good addition for pncconf

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13 years 11 months ago #27054 by PCW
Replied by PCW on topic Suggestion
Chris, if you change the G540 timings, I would suggest:

DIRSETUP = 700
DIRHOLD = 700
STEPLEN = 1500
STEPSPACE = 2500

As these are steplen and stepspace values that will not impact the maximum the G540 step rate of 250 KHz, and theres no reason for the setup and hold times to be so small. With these timings, all signals have 500 ns margin from the G540 minimums.

(250 KHz is somewhat unlikely also since this is 7500 RPM!)

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