Grounding

[VP63]

Hello,

I am using MCU S12ZVMC with external Xtal.

Should I connect VSS1 pin to the exposed pad and then Xtal local ground to pin VSS1?

Thanks in advance!

[lama]

Hi,

The AN5207:

All GROUND pins of the microcontroller (VSSX1, VSSX2, VSS1, VSS2, VSSA, and VSSB, VSSC) must be connected together.

The reference manual:

1.7.4 Package and Pinouts

…

…

The following package options are offered.

• 80LQFP-EP (exposed pad) with internal CANPHY and CAN VREG.
• 64LQFP-EP (exposed pad) with internal LINPHY or HV physical interface.
• 64LQFP-EP (exposed pad) with CAN VREG to support a low cost external CANPHY.
• 48LQFP-EP (exposed pad)

The exposed pad must be connected to a grounded contact pad on the PCB.

The exposed pad has an electrical connection within the package to VSSFLAG (VSSX die connection).

The pin out details are shown in the following diagrams. Signals in brackets denote routing options.

Best regards,

Ladislav