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1  Using Arduino / Microcontrollers / Re: ATMEGA328 and PL2303HX on: March 10, 2013, 08:22:41 am
In the datasheet it is stated for the RX pin "SCHMITT In, 5V Tolerant, Input Pad. Level and Driving Capability decided by VDD_325.'

So basically if i powered pin 4 VDD_325 with 5v it should work fine.
2  Using Arduino / Microcontrollers / Re: ATMEGA328 and PL2303HX on: March 10, 2013, 08:03:38 am
I guess you were reading the datasheet of the PL2303 not the PL2303HX because in the datasheet of the PL2303HX it is stated that pin 4 VDD325:

Quote
RS232 VDD. The power pins for the serial port signals . When the serial port is 3.3V, this should be 3.3V. When the serial port is 2.5V, this should be 2.5V

Edit:
http://aitendo3.sakura.ne.jp/aitendo_data/product_img/ic/audio/PL-2303HX_Documents_Application%20Notes.pdf

You can check it out for comparison and there's also a schematic at the end, I just want to know if it'll work with 5v directly.
3  Using Arduino / Microcontrollers / ATMEGA328 and PL2303HX on: March 10, 2013, 06:34:05 am
Can I connect the Serial ports of the PL2303HX to the ATMEGA328, as I read online, the tolerance level of the serial port signal of the PL2303HX are 2-3.3v but the ATMEGA328 tolerance is 5v.

Should I hook up a voltage divider between the TX of the ATMEGA328 and the RX of the PL2303? or would the PL2303HX can tolerate 5v?

Thanks.
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