[minima] Re: About running ATmega328 at 3v3
- From: Ashhar Farhan <farhanbox@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Fri, 7 Feb 2014 00:33:22 +0530
if you configured your PC serial port to run at 4800 instead of 9600
everything would work all the same. the same chip, at 3.3v, 8 mhz and the
timing software will slow down by half. i could try it out and report back
- f
On Thu, Feb 6, 2014 at 9:33 PM, Paolo Cravero <paolo.cravero@xxxxxxxxx>wrote:
> Farhan, it was not my intention to push towards a 3v3 only configuration.
> I wanted to share some thoughts about feasibility and I like the way it is
> now (standard 5V Arduino chip and 3v3 Si570): the change in library file is
> the most straightforward of all solutions.
>
> For those worried of frying the Si570 control lines if they forget to
> modify the library, the datasheet under Absolute Maximum Ratings mentions
> "-0.5 to VDD + 0.3" Volts for V_i (input voltage). Wouldn't a Schottky
> diode in parallel to 3V3 pullup resistors be a safeguard good enough?
>
> Atmega pin on left, 3v3 on right:
> |------|>|-----|
> |---/\/\/\/\---|
>
>
>
> 73,
> Paolo
> <http://bit.ly/VtE3c4>
>
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