Power Management中的主题 Re: FS4503 Grounding

FS4503 Grounding

wade_liu — Tue, 10 Dec 2019 03:49:18 GMT

Hello!

Please help us clarify the following questions

1. Witch pin the return path of GATE_LS?(AGND or DGND)

2. GND of S32K144 is no distinction between digital and analog (No DGND,AGND, Only Vss), How do you recommend grounding while we use FS4503 & S32K144?

Thank you!!

Re: FS4503 Grounding

reyes — Tue, 10 Dec 2019 18:10:41 GMT

Hi,

[A1] Return path of GATE_LS is AGND. But at the end you can connect all the ground together as in the schematic in the following link: https://www.nxp.com/downloads/en/schematics/FRDMFS4503CAEVM-A-SCH.pdf

[A2] S32K144 have VSS (Ground) and VSSA (Analog Ground), but both must be shorted to a general GND at package level.

Have a great day,
Jose

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Re: FS4503 Grounding

wade_liu — Wed, 11 Dec 2019 06:44:44 GMT

Thank you for your information!

So, that's mean the return path of 12V battery (VSUP1/2) is also AGND?

I will connect AGND & DGND together, but I'm thinking about where to place common point on the PCB layout.

Re: FS4503 Grounding

reyes — Wed, 11 Dec 2019 17:33:50 GMT

Hi Wade,

Correct, the return path of 12V battery (VSUP1/2) is also AGND.

Connecting the AGND & DGND together can be done by placing an inductor (around 1uH or less) between them.

Regards,

Jose