zeke

That connector is a simple 0.050" spaced header which means that it's nothing exotic - just tiny.
 
MDFLY has them suuuuuuuuper cheep.
 
Male connectors.
 
Female connectors.
 
Cue the MC Hammer song "Can't Touch This".
 

..................
 
Can't Touch This!

 
Don't boo me. I just need more sleep.

Just click that little thumb sign for me :mrgreen:
 
BTW, just to be picky, it looks like R8 & R9 are about 0.040" apart. The kinks in the USB N&P tracks cause an impedance discontinuity. To avoid that, you could skooch R8 and R9 closer together so that their sides line up with the track edges. It will then look like a straight line.
 
Good work!
:thumbup:

I'm not sure what the crossover is specifically.
 

If you have a ton of TH crystals then your choice makes sense. The guy you sell this board to may not though.
 
The only gotcha with a TH crystal is that you can't let the body of the crystal touch the ground plane you've poured under it. If it does then it probably is also touching the tracks coming from the crystal pins and that shorts out the crystal. That's why TH crystals had insulator pads on them in ancient days.
 
The USB tracks should make the straightest line between the connector and the chip as reasonably possible. Make sure the tracks are 0.010" wide. Make sure they have a 0.010" space between them. That's it. Any components that have to attach to the USB tracks should do so at a 90' angle so that the track path isn't disturbed. It is also preferable to minimize their length, if possible.
 
I haven't consulted the design files for TI's 5529 board so I don't understand their design selections. The 27 ohm resistors are there to minimize the transient responses that occur on the USB lines. They limit the current spikes but they also lower the maximum speed on that transmission line. I guess it all depends upon the MCU and what it expects. For comparison, the FTDI chips want 0 to 10 ohms there.
 
There's no need to worry about your EE skills. You are demonstrating good EE skills with your work. Just because I'm buffing your layout doesn't mean it's a bad design. I'm sure the design will work. I'm just offering a contrasting opinion for you to compare against. It's like two artists talking about a work of art - a matter of taste and opinion for the most part.
 
Again, GOOD JOB! And I mean it! :thumbup:

Crossing the trace is not a good thing. Blows the transmission line characteristics all to "H.E. double hockey sticks". It will result in slow USB speeds and other unintended consequences.
 
Re-route the USB traces off the backside of their pads and they will re-orient themselves properly to the USB connector.
 
You'll have to move the PUR trace to the frontside of its pad and then, using vias, route it over to the switch.
 
You'll then be able to keep the VBUS trace on the topside. Just re-route it off the frontside of its pad as well.

One other thing to look into is using numpy/scipy for number crunching. I have been using that combo both for work and at home for a couple of years now.

Crossing the trace is not a good thing. Blows the transmission line characteristics all to "H.E. double hockey sticks". It will result in slow USB speeds and other unintended consequences.
 
Re-route the USB traces off the backside of their pads and they will re-orient themselves properly to the USB connector.
 
You'll have to move the PUR trace to the frontside of its pad and then, using vias, route it over to the switch.
 
You'll then be able to keep the VBUS trace on the topside. Just re-route it off the frontside of its pad as well.

Been eagerly awaiting mine. Now I am just wondering why TI's F4 kit is so expensive.

I believe RobG already implemented a hardware debounce circuit.
 
I wonder which post that's hiding in?
 
Oh! It's this one. Back on page 2 there are a couple hardware debounce circuits.

Also, notice that you can enter to win a Fluke meter here.
 
Yes. It's a second contest.

Also, notice that you can enter to win a Fluke meter here.
 
Yes. It's a second contest.

I know not many buy directly from Fluke. But if you do:
 

All CCS licenses seem to currently work on Platinum. See the pricing promotion details here (first section in red): http://www.ti.com/tool/ccstudio
 
I have confirmed that this license works for CCS V4 Platinum on Windows, node locked (via MAC address). I removed my 16K code-limited version and replaced it with Platinum.
 
I have also confirmed that this works for CCS V5 on Linux, node locked. I am assuming it is Platinum since there is only one version available to beta test, and it's got support for all of the DSPs and has DSP/BIOS. Still no MSP430 support though (on Linux).
 
When you validate the license, it will ask you if you want to download the software. Click yes and it automatically provides a link to Platinum V4 / Windows.

Dataq also makes that kind of stuff.

Seriously, how come noone asked for this before? :twisted:

Well i ordered one yesterday along with a breakout board by sparkfun. Ill be sure to let you know how it went.

If you have a ton of TH crystals then your choice makes sense. The guy you sell this board to may not though.
 
The only gotcha with a TH crystal is that you can't let the body of the crystal touch the ground plane you've poured under it. If it does then it probably is also touching the tracks coming from the crystal pins and that shorts out the crystal. That's why TH crystals had insulator pads on them in ancient days.
 
The USB tracks should make the straightest line between the connector and the chip as reasonably possible. Make sure the tracks are 0.010" wide. Make sure they have a 0.010" space between them. That's it. Any components that have to attach to the USB tracks should do so at a 90' angle so that the track path isn't disturbed. It is also preferable to minimize their length, if possible.
 
I haven't consulted the design files for TI's 5529 board so I don't understand their design selections. The 27 ohm resistors are there to minimize the transient responses that occur on the USB lines. They limit the current spikes but they also lower the maximum speed on that transmission line. I guess it all depends upon the MCU and what it expects. For comparison, the FTDI chips want 0 to 10 ohms there.
 
There's no need to worry about your EE skills. You are demonstrating good EE skills with your work. Just because I'm buffing your layout doesn't mean it's a bad design. I'm sure the design will work. I'm just offering a contrasting opinion for you to compare against. It's like two artists talking about a work of art - a matter of taste and opinion for the most part.
 
Again, GOOD JOB! And I mean it! :thumbup:

Remember. Nothing personal.
 
The first thing I always look at is the crystals.
 
A guy I used to work for thought he was hot **** as a layout artist because he could a) buy the $6000 software with pocket change and knew how to engage the autorouter function. His precious autorouter managed to make one leg of the crystal 4cm long and the other leg 8cm long while passing through at least two vias!
 
I had to break it to him that his board wouldn't run even at 32kHz. I thought I was going to get fired.
 
Anyhoo. Water under the bridge.
 
This is just a few of my observations.
 

- Ground the body of XT1 (32kHz). Make sure to use a big thermal relief pad just like your 0.032" through-hole grounds.
- Switch XT2 to an HC49/U style crystal. It's SMD, easy to obtain and super easy to work with. (eg: Abracon ABLS-16.000MHZ-B4-T)
- Rotate R5 and C4 a quarter turn so that their common pads are closer together
- Rotate R4 and C3 a quarter turn so that their common pads are closer together also.
- The USB lines must be routed as an impedance controlled transmission line. 0.010" tracks spaced at 0.010" over top of ground plane on the other side should maintain 50ohms.
- Add in two ESD surge protectors between the USB N & P lines and ground. eg: Littelfuse PGB1010603NR. Place them close to the USB connector ahead of R8 and R9
- R10, C13 and C14 on the USB N and P lines. Why? I can't see that being a good thing. Is that in a TI App Note?
- Change R8 and R9 to 10ohm. Did TI suggest that value?

 
I can see your preferred layout pattern (45') and I can see the attention to detail.
 
Good use of ground vias.
 
All in all, good job!
 
I hope that was helpful.

I am learning Python in college right now as an experienced programmer. We are using one of the books linked on that list you showed: http://www.greenteapress.com/thinkpytho ... ython.html
It's a pretty good book but is a bit basic. Python is pretty darn easy to learn just sitting down and trying with Google at your side.
 
I also use PyQt /PyQwt at work and its pretty neat. A lot easier than Java and Swing in my mind. The development in Python is freaking fast. I'd recommend it.

https://sourcery.mentor.com/sgpp/lite/a ... plate=lite
 
You want the EABI one, as far as I can tell.
 
The following links may also be of interest (to some):
 
https://github.com/texane/stlink
http://code.google.com/p/stm32flash/
 
(Haven't tried any of these, just have them stashed away ).

I just stumbled upon the legal motherload of python ebooks here.

I just noticed pyQwt.
 
Take a look at these screenshots.
 
Kinda gets me excited.

I got a call from a sales droid from Embarcadero today. He wanted me to buy RadStudio XE2. 10% off until the end of the month. I asked him "Where have you been since 2005? C++Builder has been a walking zombie since then."
 
That got me thinking of the alternatives to their mega dollar programming environment. Python and Qt came to mind.
 
So, while googling for python gui programming, I stumbled onto Google's python class tonight.
 
I watched the first video on youtube. I think I'll be watching the rest of them.
 
I've also put this author on my reading list: Mark Summerfield
 
I am hoping that I can make interactive programs kinda like this live data monitor only with two way communication.
 
Anyhow... I'm starting with Google's online Python class.

I got a call from a sales droid from Embarcadero today. He wanted me to buy RadStudio XE2. 10% off until the end of the month. I asked him "Where have you been since 2005? C++Builder has been a walking zombie since then."
 
That got me thinking of the alternatives to their mega dollar programming environment. Python and Qt came to mind.
 
So, while googling for python gui programming, I stumbled onto Google's python class tonight.
 
I watched the first video on youtube. I think I'll be watching the rest of them.
 
I've also put this author on my reading list: Mark Summerfield
 
I am hoping that I can make interactive programs kinda like this live data monitor only with two way communication.
 
Anyhow... I'm starting with Google's online Python class.

Check the footnote at the bottom of the page.
 
It's Lucid Lime style by Eric S