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Member Since: December 7, 2011

Country: United States

  • According to the ATmega328 datasheet, Vih is 0.6Vcc at Supply voltage of 5v.

    So Vih in my case is 3v.

    I'm probably not going to find a datasheet for an iPhone 3G (my 3.3v device) so i'll just have to try it and find out!

    Thanks for your help :)

  • Why can't I just use a simple resistive voltage divider with 1.5k + 3k in series, take the output across the 3k resistor to get 3.3v?

    That would be used on the TX line of the 5v device. Is it because the +3.3v on the other device's TX isn't a strong enough logic high for the +5v device's RX?

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