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Topic: ATMEL Mega1284P evaluation board avalible (Read 76 times) previous topic - next topic

CrossRoads

Looks like it could fit, have to see if its routable or not. Kinda jammed up by the SD card driver & RS232 driver.
Still no JTAG/ICSP headers.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

retrolefty

#11
May 15, 2011, 12:13 am Last Edit: May 15, 2011, 12:23 am by retrolefty Reason: 1

I think that's one major advantage of the 1284 - you can get it in DIP :)


That was my whole point. I homebrew some of my stuff, but only in DIP version, too old and tired to do major smd hand soldered layouts.

Another question is the 1284 and 644p pin compatable in the DIP versions? An arduino board that could utilize DIP 644p and 1284 would open my wallet, assuming the IDE software could be made to work with it by mear mortals like myself.  :D

EDIT: Answered my own question by reviewing datasheets: 644p and 1284 are pin compatible in 40pin dip version at least.

Lefty

tastewar

For my own personal interest, DIP vs SMD isn't a big deal. I think conceptually I like the idea of DIP as it does afford more flexibility. But, as to the RS-232, for my own (current) need, just some form of header would be even better, as I need (well, want) to get to an RJ-11.

Graynomad

I'd ditch the DB9 and use a header. You can get IDC DB connectors that use ribbon cable so they still look neet and can easily be mounted remotely, makes fitting the board into an enclosure easier and you can swap from male to female without desoldering a connector.

That should route easily (manually of course :)), using the DIP doesn't really make it worse because you can run 2 lines between pins, whereas the TQFP is basically a no go zone for one layer.

Please get rid of the huge USB connector and use a mini B.
 
Add a jumper (not a solder bridge) for the auto reset so it can easily be disabled.

The headers at the end of the chip are pretty close, Ok if you use a screw driver to remove the chip from the other end but may get in the way of a chip puller.

Crystal too close to the chip, especially with a socket.

I'll shut up now, I guess it's just a quick mock up but thought I'd highlight a couple of things anyway.

______
Rob


Rob Gray aka the GRAYnomad www.robgray.com

CrossRoads

#14
May 15, 2011, 03:24 am Last Edit: May 15, 2011, 03:33 am by CrossRoads Reason: 1
Well, I got the schematic redone for the DIP, added solder bridge fields to route I2C or A4/A5 to the shield header.
Can change the solder bridge things to pins when I see that it routes okay, same with moving the crystal a scooch and pulling the DB9 off.
Will look at the header spacing also, can move if the db9 is gone.
USB change as well.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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