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I had an Arduino UNO (ATmega168) standalone working, but I need more pins, and I decided to use the ATmega2560, I was searching for some schematics, and none of them shown an ATmega2560 standalone, only the full Arduino, with the FTDI, power transformers... etc integrated. So taking parts from those designs, I made this, but I don't know if it's enough or I need Something more: enter image description here

Note: VCC2 is connected to 5V.

Arnyminer Z
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2 Answers2

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You need more decoupling capacitors - one per VCC and AVCC pin, plus a larger (10µF) for the whole chip.

You need a pullup resistor (and maybe button) on RESET.

Majenko
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  1. check the datasheet;

  2. I would put a pull-up on the reset pin, plus a small capacitor;

  3. crystal + capacitors as optional;

  4. AVCC to VCC with filtering, if you need good analog performance;

  5. separate Vbat domain, if it has one.

...

dannyf
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