Hello all
I am having a go at designing my own PCB for a project. My first design uses a standard Teensy 3.2 directly mounted on top of the pcb for ease.
However, this uses up a lot of real estate, especially as I am not actually using that many of the pins.
I thought my second attempt would be to try and reproduce a Teensy 3.2 in component form. I found the circuit diagram, but I have questions about a few of the parts/connections.
But, this is my first attempt, so not really sure what the heck I am doing (but there is only one way to learn).
https://www.pjrc.com/teensy/schematic.html
1. Ferrite coils connected to pins 7 and pins 16. What value? I guessed 120R?
2. Resistors that are unmarked (470? attached to pin 14, 33? attached to pins 5 & 6). Again, I am assuming these are 470R and 33R.
3. Diodes on pin 23. What is 1A?
4. Capacitors. They are shown as having polarity, yet surely these are just small polyester type caps?
I believe I can eliminate most of the capacitor/ferrite suppression that feeds AGND, as I am not using any analogue inputs (therefore not using AGND).
Anything else I should be aware of? (Apart from the chances of it working first time are slim!). The Crystal. I understand this needs to be surrounded by a ground plane?
I can imagine the eyes rolling as I type
I am having a go at designing my own PCB for a project. My first design uses a standard Teensy 3.2 directly mounted on top of the pcb for ease.
However, this uses up a lot of real estate, especially as I am not actually using that many of the pins.
I thought my second attempt would be to try and reproduce a Teensy 3.2 in component form. I found the circuit diagram, but I have questions about a few of the parts/connections.
But, this is my first attempt, so not really sure what the heck I am doing (but there is only one way to learn).
https://www.pjrc.com/teensy/schematic.html
1. Ferrite coils connected to pins 7 and pins 16. What value? I guessed 120R?
2. Resistors that are unmarked (470? attached to pin 14, 33? attached to pins 5 & 6). Again, I am assuming these are 470R and 33R.
3. Diodes on pin 23. What is 1A?
4. Capacitors. They are shown as having polarity, yet surely these are just small polyester type caps?
I believe I can eliminate most of the capacitor/ferrite suppression that feeds AGND, as I am not using any analogue inputs (therefore not using AGND).
Anything else I should be aware of? (Apart from the chances of it working first time are slim!). The Crystal. I understand this needs to be surrounded by a ground plane?
I can imagine the eyes rolling as I type