RS-232 to TTL cable with MAX232

Posted on Oct 21, 2012

Here is a diagram of the internals of the MAX232A. It shows a double charge pump voltage doubler and a +10v to -10v voltage inverter. The voltages output are used to generate the RS-232 compliant signals. The MAX232A has provisions for two serial ports on the same physical package. Most people only connect one of them. You can get a data sheet for the MAX232 and friends from Maxim.

RS-232 to TTL cable with MAX232
Click here to download the full size of the above Circuit.

There are two camps on how to implement serial ports on a robot. One says stick the MAX232 on the robot. The other says don't. I kind of like the don't category! Most of my robots are autonomous, so I don't really need the MAX232 onboard consuming power.

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