S32K JTAG/SWD Pull-Ups and Pull-Downs

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S32K JTAG/SWD Pull-Ups and Pull-Downs

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damiendusha
Contributor II

Dear All,

I am attempting to reconcile the differences in the pull-up/down configuration between the hardware design guide and the EVK.

In the Hardware Design Guide p5-6, pull-ups/downs are "required" as follows:

pastedImage_1.png

However, the S32K144EVB schematics contains a pull-up only on TMS, and can be isolated from the OpenSDA processor via jumpers.

pastedImage_2.png

pastedImage_3.png

How does one reconcile the design of the EVK with the recommendations in the HW design guide?

Kind regards,

Damien.

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danielmartynek
NXP TechSupport
NXP TechSupport

Hello Damien,

Yes, the S32K144 EVB doesn't follow the recommendation.

However, the newer S32K1xx EVBs use use pull resistors already.

For example,

S32K148 EVB:

pastedImage_1.png

S32K146 EVB:

pastedImage_2.png

Regards,

Daniel

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2,328件の閲覧回数
danielmartynek
NXP TechSupport
NXP TechSupport

Hello Damien,

Yes, the S32K144 EVB doesn't follow the recommendation.

However, the newer S32K1xx EVBs use use pull resistors already.

For example,

S32K148 EVB:

pastedImage_1.png

S32K146 EVB:

pastedImage_2.png

Regards,

Daniel