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Original question:

RM44L920: GIO open drain output characterisic

RM44L920: Hercules™ safety microcontrollers forum

Charles Cammarata45
Intellectual 270 points
Part Number: RM44L920

When using a crystal with connections to the metal case, the crystal manufacturer suggests to tie to GND.

Is it better to tie the crystal case to signal GND or KELVIN GND?

  • 0
    TI__Guru**** 186196 points

    Hello,

    The external crystal load capacitors should be tied back to Kelvin_GND. Kelvin_GND is not intended to be shorted to other GND lines externally. The reason not to tie Kelvin_GND to the PCB ground is so that you keep high switching currents out of this signal.

    About how to connect the crystal case, we don't have any recommendation. I'd go with tie the crystal case to the PCB ground.