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Unread 09-10-2014, 10:50
Aren Siekmeier's Avatar
Aren Siekmeier Aren Siekmeier is offline
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FRC #2175 (The Fighting Calculators)
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Re: 2015 Beta Testing - PWM voltage levels

Quote:
Originally Posted by Mark McLeod View Post
The 3.3v/5v internal jumper only affects the DIO power output.
The PWM signals are always 5v max.
The PWM power is always 6v. The motor controllers have this line disconnected, so power on it doesn't affect them.
I was wondering today about how exactly all the signals are pulled up/down.

I've seen in the myRIO docs that all the DIO pins are pulled up to 3.3V with a 40k (or 2k for the shared I2C pins).

Are the main PWM pins pulled down to ground like they were 09-14? How strong/weak is the pull down?

And most importantly, if main PWMs are pulled down and all DIOs are pulled up, what is the roboRIO doing with the shared PWM pins on the MXP breakout?
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