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Hi Joe, are you sure about MAX ic that its not a serial decoder, and just a level shifter, if so...then i can simply use a zener diode to drop voltage and a 40XX buffer ic to up the level without any inversion...Originally Posted by Joe S.
Best Regards
Jamshid Dastur
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Aw heck no, I'm not SURE about anything! I thought you wanted to switch a 5v level with 3v, I guess you want to go the other way.
If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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There simply is no "Happy Spam" If you do it you will disappear from this forum.
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Jamshid, you should use a MAX3232 not a Max233. But there is a simpler way to interface serial TTL to a serial 3V, this is using a partition of resistors. Use for each line (Tx & Rx) 3x10K resistor in series from pic pin to ground. Connect the 3 V serial device to the second resistor so that you have 20K from ground for the 3 V device and 30K for the TTL. This is the system I use and it works fine.
Al.
Last edited by aratti; - 24th December 2008 at 21:37.
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