Arduino Forum

Forum 2005-2010 (read only) => General => Bar Sport => Topic started by: jezuz on May 31, 2010, 05:32 am

Title: ATMEGA chip's 5v and gnd pins?
Post by: jezuz on May 31, 2010, 05:32 am
I'm working on a PCB design in eagle and now that I'm on the routing stage I've realized how tough it is to get *every* 5v pin on the 1280 connected properly (due to space constraints). So my question is, do all the 5v pins on the 1280 (or any ATMEGA chip for that matter) need to be connected or are they all internally connected anyway?

Title: Re: ATMEGA chip's 5v and gnd pins?
Post by: retrolefty on May 31, 2010, 06:21 am
If you check the Atmel data sheet they say you must supply Vcc power to all designated pins, at least that is my memory.

As far as routing all the I/O pins, you might want to check out the Seeeduino site, their mega board (which is the same form factor size as the smaller Arduino board by the way) routes all the I/O pins to connector pads. They have the various board layout files avalible for downloading.

Lefty
Title: Re: ATMEGA chip's 5v and gnd pins?
Post by: jezuz on May 31, 2010, 06:23 am
Cool, thanks. I was just wondering about the 5v pins because they *tend* to take up extra space, making the routing process more of a hassle.