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problem with printf using PIC16F687 - garbage on RS232
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hanhao



Joined: 21 Mar 2007
Posts: 24

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PostPosted: Tue Mar 27, 2007 1:17 am     Reply with quote
finally got it to work using the surface mount sipex chip
pretty bad noise on the negative voltage but still readable

but now it seems that i have to read on 38400 baud rate when i have programmed it at 9600

does anyone knows why?
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Tue Mar 27, 2007 8:04 am     Reply with quote
Most likely because this negative voltage is generated inside the sipex chip with a charge pump. It can look ugly. But if it works it works...
Did you remember all the caps required on the circuit. Most charge pumps will have a cap to smooooooth this out the generated voltage.
Looking at the spec. it would be c2- on pin 3.
http://www.sipex.com/Files/Datasheets/SP3249E.pdf
page 4
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