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Topic: help understanding 556-ATmega328p-pu pins (Read 2280 times) previous topic - next topic

joshp689

I have a ATmega328p-pu MC and I know the in/out pins but there are more then 1 ground, and I didn't see an "IN" power for the MC. does any one have a diagram for the MC that's in layman's terms?

larryd

Here are 3 WEB sites for you to review:

http://www.pighixxx.com/downloads/the-definitive-arduino-pinout-diagram/
http://arduino.cc/en/Main/arduinoBoardUno
http://www.gammon.com.au/forum/?id=11473
No technical PMs.
If you are asked a question, please respond with an answer.
If you are asked for more information, please supply it.
If you need clarification, ask for help.

joshp689

is the "vcc" the pin I would supply power to the MC?

larryd

Yes VCC is connected to +5Volts on the 328.
No technical PMs.
If you are asked a question, please respond with an answer.
If you are asked for more information, please supply it.
If you need clarification, ask for help.

joshp689


Yes VCC is connected to +5Volts on the 328.


which "VCC"? they have two, one on each side?

CrossRoads

Any and all VCC and AVCC pins must be connected to 5V.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

joshp689


Any and all VCC and AVCC pins must be connected to 5V.


when you say must, do you mean I have to have 5v to that pin or that pin can only take 5v?

fungus



Any and all VCC and AVCC pins must be connected to 5V.


when you say must, do you mean I have to have 5v to that pin or that pin can only take 5v?


http://www.merriam-webster.com/dictionary/must
Advanced Arduino

CrossRoads

Quote
I have to have 5v to that pin or that pin can only take 5v?

Yes & mostly Yes.
You must supply 5V to that pin (VCC/AVCC power the chip internally).
Absolute Max is 6V, no more than 5.5V is recommended per the datasheet.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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