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HCS12 VDD1,2 Supply pins

Question asked by Pedro Ferreira on Jul 14, 2017
Latest reply on Jul 20, 2017 by Radek Sestak

Good afternoon,

We are making use of a microcontroller from the former HCS12 family, namely MC9S12XDP512CAG.

Due to a manufacturing issue, the pins VDD1,2 are mistakenly connected to a 3.3V source, instead of left open (for internal voltage regulator, since VREGEN is connected to 3.3V).

In the datasheet it says explicitly that these pins should have no load and should not be connected together.
VDDPLL is free (not connected to 3.3V).

The boards work and seem not to have any issue. Detected by now.

We’d like to know what could be the repercussions of this issue.
And in terms of danger/damage, accuracy or life cycle of the processor?

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