Dave Jones

MCF52233 / MCF52235 VSSPLL pin

Discussion created by Dave Jones on Oct 21, 2008
Latest reply on Oct 26, 2008 by Robert Gaftel
I am confused. In the schematic that came with the M52235EVB the VSSPLL signal seems to be connected to bypass caps and the caps for the crystal, but has no path to the board ground.

In the 52235 datasheet it shows a typical connection with that pin tied to ground.

Which is correct? Is the schematic wrong for the EVB and the VSSPLL is really tied to ground (directly or via a ferrite bead?) Or is it really being used for connecting those caps to the chip and truely is not being connected to the board ground??

I'm trying to finish a PCB layout today and need this info ASAP.