How to run ATmega328P-PU using 3.7v Lipo 600mAh?

Question

I want to run bare ATmega328P-PU using 3.7v 600mAh Lipo Battery. The Lipo is used to run Nano Quadcopter. The discharge rate is 20C.

My Question is: 1. Will connecting Lipo to my atmega directly fry up my chip? 2. Do I need any Voltage regulator?

What does the Atmega data sheet say about permissible supply voltages? — , Dec 22 '14 at 14:16
The voltage should be fine for your 328P, provided you lower your clock speed enough. But the motors in your QC might generate significant noise and/or voltage spikes that could trouble or even damage your micro. — marcelm, May 25 '16 at 16:31

score 3 · Accepted Answer · answered Dec 22 '14 at 14:18

3

Page 2 of your datasheet:

Operating Voltage:
 1.8 - 5.5V

So yes you can connect it directly without a voltage regulator

answered Dec 22 '14 at 14:18

GmodCake

4

And if you do decide to connect it directly, be sure to add some bulk capacitance, along with standard decoupling. – Matt Young Dec 22 '14 at 14:28
Will current provided by lipo fry up my atmega? – AngryBird Dec 22 '14 at 16:04
Well no, the current will depends on the needs of the atmega – GmodCake Dec 22 '14 at 16:25
I don't know why but my one atmega chip is not working now, because I provided about 1.8 A current once, voltage was 5.1V – AngryBird Dec 22 '14 at 16:26
Well from my little knowledge, the current of a atmega is only a couple of mA, if you got to Amps, maybe you miss wired something ... – GmodCake Dec 22 '14 at 16:29
What else is connected to your mega ? Robot ? motor? This could be the reason ... – GmodCake Dec 22 '14 at 16:32
Will the change in voltage as the battery is discharged make the internal clock inaccurate? – osvein Jul 18 '15 at 19:00
If you quote the voltage from the datasheet, also quote that it's only guaranteed to run at 10MHz @ 3.7V. – marcelm May 25 '16 at 16:28

score 2 · Answer 2 · edited May 25 '16 at 15:29

2

You can connect it directly, but note that the frequency you run it at is affected by voltage:

0- 4MHz@1.8 - 5.5V

0 - 10MHz@2.7 - 5.5V

0 - 20MHz@ 4.5 - 5.5V

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edited May 25 '16 at 15:29

Community

answered Dec 22 '14 at 14:28

kolosy

In practice though, you *can* clock the newer avr parts at ~16MHz down at 2.7 even though the datasheet says otherwise. I just wouldn't trust it for anything where timing is critical... – Luke Gary May 25 '16 at 19:15

2 Answers2