Hi,
I have followed the instructions in the spark fun tutorial http://www.sparkfun.com/commerce/tutori … als_id=108 whichs tells you how to layout a FT232 Breakout board.
I used this design to create a small host board for a ATMega328.
I have not yet soldered my ATMega onto the board, but instead tried to get the PC to see the chip, unfortunaltely the PC does not see the chip at all, I dont even get a ‘Device not recognised’. It seems to not do anything at all!! I have checked for any shorts, and my circuit is very very similar to the sparkfun tutorial.
Would anyone who has used this chip be so kind as to look at my circuit and see if I’ve made any obvious flaws?
Here is the schematic: http://www.jamesdcarter.com/schematic.png
Here is the board layout: http://www.jamesdcarter.com/circuit.png
Many Many thanks.
I don’t see any problems with the schematic around the FT232R. Did you etch this board yourself? It looks like you need to get out the multimeter and start checking connections and make sure there aren’t any shorts. Look for silly things as well, like soldering the chip on backwards.
All those decoupling and power filtering capacitors should have been between the power input from the USB connector and everything else. Putting them off to the side doesn’t help. Your decoupling caps for the AVR should be closer to the pins.
You have your Laser and I2C connectors labeled backwards.
Mark,
Thank you very much for your reply, I have checked the chip, it is on the right way round. I have had quite a lot of multimeter probing, but will do more.
Yes I etched this board myself: http://www.jamesdcarter.com/IMAG0087.jpg
Also, thanks for the info about the decoupling caps - I will do this next time, this is my first real board.
yah time for a multimeter.
the best resource for the FT232R is the datasheet.
it has all the schematics youll need for any application.
also make sure you are looking in the control panel when u connect it becuase you may already have the generic FTDI vid and pid drivers installed for some other device in your system.
so instead of getting a new hardware box, you just get a USB connect sound,… (turn speakers on…)
