lpcware

LPC11C24 CAN supply

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Nov 21, 2016 by alexandreturrel
Content originally posted in LPCWare by munoa9 on Tue Jun 07 01:59:35 MST 2016
Hello,

I would like to clarify an issue about the CAN I/O supply pin VDD_CAN, I hope someone can help.
In the datasheet says this pin operates between 2.8 and 5.5 V, but they also say that it has to be connected to microcontroller's VDD pin which is 1.8 to 3.6V. This makes me confused. I don't see why these pins have different supply ranges if they should be connected together.

In order to find some examples, I have purchased a dev kit from Olimex and they connect VDD_CAN to 5V. I didn't have any problems so far, but I wonder if this design is robust.
https://www.olimex.com/Products/ARM/NXP/LPC-P11C24/

On the other hand, I see in the LPCXpresso LPC11C24 dev kit, that pin is connected to 3.3V.
http://www.embeddedartists.com/sites/default/files/docs/schematics/LPCXpressoLPC11C24revB.pdf

Does someone have more information about this pin? Is it fine to connect VDD to 3.3V and VDD_CAN to 5V?

Thank you in advance.

Best regards,
Jon




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