DC1 and DC2 pin of the ST10F269 connected to Vcc

petertheunissen9 · ‎2006-03-29

Posted on March 29, 2006 at 12:35

petertheunissen9 · ‎2006-03-28

Posted on March 29, 2006 at 09:19

Hello,

I connected the DC1 and DC2 pins of the ST10F269 abusively to +5V and worked with that PCB for days (yes I know, it's very stupid, but the PCB was first designed for a C167CR). It worked without any problem (as it seems). Now I fixed it.

Can anyone tell me if this can cause permanent damage to the controller?

Thanks for a fast response!

najoua · ‎2006-03-29

Posted on March 29, 2006 at 10:48

Hello,

The DC1 and DC2 pins are used for decoupling the internally generated 3.3V core logic supply. They must NOT be connected to 5.0V external supply.

These pins should be connected to decoupling capacitors which are mandatory, otherwise the internal regulator will not work correctly.

So your PCB should be re-designed in order to introduce the decoupling capacitors.

Regards,

Najoua.

petertheunissen9 · ‎2006-03-29

Posted on March 29, 2006 at 11:06

Hello,

We are already changing the PCBs. However, the problem is that we have several PCB's which have been operated for days with this error. So my question is: is it likely that the microcontrollers are damaged? If so, then we have to exchange them after changing the PCB.

Best regards,

Peter

[ This message was edited by: Peter_ on 29-03-2006 15:11 ]

najoua · ‎2006-03-29

Posted on March 29, 2006 at 12:35

Hello again Peter,

Yes, it is likely that the microcontrollers are damaged so it will be better to exchange them.

Regards,

Najoua.