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ATD reference voltage

Question asked by thommes on Oct 10, 2012
Latest reply on Oct 12, 2012 by thommes

Hello,

 

I want to use the ATD on the MC9S12D64 with an external reference voltage. I want to use the LM336-5.0 as a 5V reference voltage. It has an operating current up to 10mA. No i want to connect this voltage to the Vdda and the Vrh Pin, but I am not sure if this is possible. What is the highest current for these two Pins?

Is it the 2.5mA like the digital I/O's? Then i could use it this way, or not? I'm really new in building Hardware, so i would be very thankful for an answer.

Just if it is important: Vregen, Vddr,Vddx, BKGD and Reset i want to supply by a different voltageregulator.

This is what my Power supply looks like:

V_Regler2.GIF

Sorry for my bad english. Thanks and regards,

 

Thomas

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