Added SMD Crystal replacing TH Oscillator

fossasia / pslab-hardware

PSLab Hardware Design and Schematics https://pslab.io

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Added SMD Crystal replacing TH Oscillator #10

Closed CloudyPadmal closed 7 years ago

CloudyPadmal commented 7 years ago

@jithinbp I've created a copy of the project with the name PSLab_OSC and added the FOX924B Oscillators. Put it to the top layer as the PIC and routed. Can you please review if it's correct? :) Thanks a lot!!

jithinbp commented 7 years ago

Hi @CloudyPadmal I checked out your changed by cloning into your fork . Connections look good . :) However, I think it can't be merged because you have edited the main project schematic itself instead of a separate copy.

A couple of other points:

12 MHz TCXO is indeed available from Fox , and you accordingly routed its clock to MCP2200 also in parallel. Last year I had some issues with 12MHz being priced higher than 25MHz, so I had used different PLL postscaler and prescaler settings in the firmware to get the same Fp=64MHz for a 25MHz input clock. A separate 4-pin passive crystal was used for MCP2200.

CloudyPadmal commented 7 years ago

Hello @jithinbp Ah it seems I haven't created the copy correctly! I'll fix it and send a PR soon! Is it okay if I copy the content to a new folder and make edits there? KiCAD doesn't have a way to save as it seems!!

CloudyPadmal commented 7 years ago

And for the MCP2200 OSC, should I connect the same oscillator or should I add another one?

jithinbp commented 7 years ago

If you're making a separate copy, I think we can call it something that indicates it has higher precision. Analog reference can also be a higher precision one here. Maybe we should consult @mario first. But it might be painful to keep all the other hardware changes synced in both directories.

As for separate crystal, I don't think it's necessary now. 12mhz is priced the same as 25mhz on Mouser.

On 12 May 2017 9:39 p.m., "Padmal" notifications@github.com wrote:

And for the MCP2200 OSC, should I connect the same oscillator or should I add another one?

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CloudyPadmal commented 7 years ago

It's a different user tagged by mistake! @mariobehling !