I need a crystal oscillator for an atmega 328p IC. I am making my own pcb. I will be ordering from jlcpcb. There are too many smd options. Can someone point me in the right direction ? Model number or something ? I have no idea how to choose. I am basically using a few digital pins on the atmega
Do you mean a crystal, which is normally 16MHz e.g. on Arduino Uno, or do you really mean a crystal oscillator?
The former needs to be connected to something which makes it oscillate, which the 328p will do. The latter will generate the required frequency just by being powered.
Yes but only two are in stock
i just started pcb design and schematics. I need a crystal oscillator from what I have read. I will then connect it to two capacitors
On jlcpcb ? Because I found a whole bunch of them
On the picture you can see the symbol. That's what I need. Is it a crystal or a crystal oscillator ?
It's a crystal
You need a crystal for your circuit. There are also crystal oscillators in a can. That can contains both the crystal and a transistor to make a complete oscillator. But that is not what your circuit requires. Maybe your next project will want a complete oscillator, but they are used primarily to reduce the size of the physical circuit board.
I select 16MHz and in stock only two are listed
Your board should have a 100nF ceramic decoupling capacitor connected to 328p between VCC and GND. It should be as close as possible to the VCC and GND pins of the 328p. A 100 uF electrolytic between VCC and GND somewhere on the PCB would probably also be a good idea.
sounds good. thanks
Don't know.
Can you post the data sheet?
Need to know the specifications and load capacitance.
If you are selecting parts from EasyEDA, many times the inventory is wrong!
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If this is your first 328p schematic design, then before doing the PCB layout it might be worth posting the schematic on this forum to ask for a check of it before you spend time on the PCB layout. Similarly, if you haven't done a PCB layout before, it would be worth asking for a check of it before you send the gerber files off to get it made. The schematic you posted seems incomplete, e.g. if you intend to program it with an ICSP programmer then it will need a 2x3 header for the programmer.
Yes that will work.
The capacitors should be 18pf
ok thank you. does the rest look descent ?