UART 3.3V or 5.0V?

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pilamaster
Posts: 7
Joined: Fri Dec 25, 2009 3:05 am

UART 3.3V or 5.0V?

Post by pilamaster » Mon Jan 18, 2010 4:48 am

After discovering documentation i came to the conclusion that UART(CON1 and CON2 on mini2440 board) working levels are +-3.3V. Is it right?
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nicolas
Posts: 162
Joined: Sun Jun 07, 2009 4:32 pm

Re: UART 3.3V or 5.0V?

Post by nicolas » Mon Jan 18, 2010 2:59 pm

The uart's coming from the S3C2440 are 3.3v
The physicalserial port header on the mini24440 goes thru a level shifter (max232) which is +-12v.
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pilamaster
Posts: 7
Joined: Fri Dec 25, 2009 3:05 am

Re: UART 3.3V or 5.0V?

Post by pilamaster » Tue Jan 19, 2010 2:26 am

I know that physical port header works through level converter. I want to connect BT-device which works with +-3.3V TTL directly to UART, you confirm my conclusion, thanks a lot.
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