RetroBSD

2.11BSD operating system for microcontrollers
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PostPosted: Fri Oct 04, 2013 10:23 am 
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Joined: Mon Nov 12, 2012 3:17 pm
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Location: Bratislava, Slovakia
No criticism detected and I really appreciate your inputs and experience ;-)

1, Yes, TPD2EUSB30D looks nice. Especially the 3-pin variant seems to fit my overcrowded design.
2, I have to think a lot about it. Every board revision takes time and money, so there is little room for experimentation :)
3, The capacitor for PCF8563 is specified in datasheet. My usual RTC devcies don't need it, though. Cap in paralell with battery is good suggestion. Ceramic caps do have quite low leakage, it should be OK.
4, I'll include space for SMD B or C sized tantallum capacitor, it definitely won't hurt.
Unless one does it really bad - http://www.baldengineer.com/blog/2013/0 ... apacitors/ :)

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PostPosted: Fri Oct 04, 2013 10:32 am 
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Joined: Sun Apr 21, 2013 8:46 am
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jaromir wrote:


Yes, the good old exploding caps... :) Well, I am sure you know your stuff and that won't happen.


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PostPosted: Fri Oct 04, 2013 1:02 pm 
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What about a bigger sized board - 10cmx5cm - with an wiz5100 on it? Also the board could become less dense.. and with better grounding.. more space for pin headers.. less heat per square cm.. and all parts populated on the top side only..

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PostPosted: Fri Oct 04, 2013 1:28 pm 
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Once upon a time I started to draw such as board...


Attachments:
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PostPosted: Fri Oct 04, 2013 3:32 pm 
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Still thinking whether the pic32mx is still in regarding retrobsd. Maybe we have to move the focus on the pic32mz. Some people have received the samples already. Even the new pic32mx might have got the half of the current, still the sw vs. ramsize issues are there, and, based on this year's pace of sw development for the current pic32mx and activity on this forum I think the pic32mx retrobsd era is over. So it seems to me - if you are keen on pic32 and retrobsd - go for the pic32mz and do spend your time with the newest tech.. There are so many challenges with pic32mz implementation that you certainly will enjoy it :)

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PostPosted: Mon Oct 07, 2013 3:11 am 
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Joined: Sun Apr 21, 2013 8:46 am
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Jaromir,
one more thing. I see the USB is in device mode in the schematic. It's probably worth to have a host one as well (not sure whether the OS supports that at this stage). It is not a big deal technically - only one extra type A connector plus a load switch. I'd recommend AAT4610B - SOT23-5 and very cheap.


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