I've just assembled a new board using an SMD processor for the first time (http://be.farnell.com/atmel/atmega328p-au/mcu-8bit-avr-32k-flash-32tqfp/dp/1715486) Atmega328P-AU.
Until now, I've always worked with DIP-28 version, so I'm familiar with that. For this particular design however, I needed to go SMD because of space restrictions. I have never tried to upload either the bootloader or a sketch through the ICSP header, but for this project it will be the way to go, so I've put that on the print as well.
The problems begins earlier, but I might be overlooking something obvious. I have installed only the following things:
-The processor itself, 5V on pins 4,6 and 18, GND on pins 3,5,21.
-a 10k resistor to the 5V on pin 29.
-a 16Mhz crystal between pin 7 and 8, and both with a 22pF cap to GND.
There are other traces on the PCB of course, but I haven't connected them to make finding the problem easier.
When I look with my scope on either pin 7 or 8, I get no clock. I'm used to see a 16Mhz sinus on the DIP-28 package, but I see absolutely no activity here.
The processor is straight out-of-the-box, so no bootloader/sketch has been loaded yet. Is it maybe using it's internal 8Mhz oscillator or something like that?
Any ideas would be greatly appreciated!