On Sat, 3 Mar 2001, Doug Sutherland wrote: > James, > > I still think that DS275 is a better alternative. It has two 5 volt input > pins and uses an internal voltage doubler and inverter to generate the +/- > 10 volts for RS232 compatibility (instead of external capacitors). > > > Does that mean I will need to power the MAX232 off of something > > other than the serial port? > > I'm a bit confused by this. Are you planning to power the PIC off some > other serial port? If not I say skip all that nonsense and just use 5 > volts from a regulator, for both the PIC and MAX232. what I was asking was whether i was going to be able to use connection to the serial port or to exactly that. What I've decided on is using the max232 (already ordered) for testin purposes, and seeing what I want to do for other powering options later on once I worry about getting the damn assembly code working first. I am definitely a C guy and this assembly is driving me insane. But enough of a tangent, I have to go cook my pics now... take your pick whether i mean using UV to erase them or making them spark n smoke >The number of > circuit diagrams in the MAX232 data sheets ismind boggling. For simple > RS232 conversion to connect the PIC to a PC, all you need to connect > on the MAX232 is 5 volts and GND, TTL in and out, and RS232 in and out. > You usually also need to add a bunch of capacitors to generate the 10 > volts, although there are some versions of MAX232 that don't require > this. The DS275 is much simpler. It's designed to do exactly what you > are doing in a simple and small form factor. The venerable MAX232 is a > lot more flexible, but flexibility always costs in one way or another. > I bet the DS275 draws less power too. Check out the data sheet ... > > -- Doug > > > > Does a max232 draw more power, > > where it would exceed the spec of no more than 5mA? A 16c71 draws about > > 2mA; I can't expect that the MAX232 would draw more than 3, am I wrong? > > Am I missing some other crucial point here? > > > > > > > > James Davidheiser > > Drexel University > > Department of Physics > > > > "Tell a man that there are 400 billion stars and he'll believe you" > > "Say a bench has wet paint and he has to touch it" > > > > -- > > Subscription/unsubscription/info requests: send e-mail with subject of > > "subscribe", "unsubscribe", or "info" to> > Wear-Hard Mailing List Archive (searchable): http://wearables.blu.org > > please, Please, *PLEASE* don't subscribe through a forward/false domain > > -- > Subscription/unsubscription/info requests: send e-mail with subject of > "subscribe", "unsubscribe", or "info" to
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