How do I determine which revision I have of the S32K148EVB-Q176?

[jorge_cifuentes]

Hi,

I got two S32K148EVB-Q176 boards and two TJA1101 Ethernet daughter cards. I am planning to communicate two of these boards together, in the same network through their ethernet interfaces. I am using the lwip_s32k148 example. The documentation of the example has the following:

"The TJA1100 daughter board is configured as a RMII interface to properly work. However, the S32K148 EVB (RevA) is
by default configured to work with an MII interface.
In order for the example to work, resistors R123 and R514 must be populated and resistors R137 and R96 depopulated.
These changes are in place on the S32K148 EVB (RevC)."

My question is, how can I tell which Revision (A,C or whatever) I have of my S32K148EVB-Q176 boards? I would like to know if I should make those resistor changes or not on my boards.

The box in which the eval board came does not have any clear indication of the revision.

On the other hand, the PCB of the eval board has the following printed on the bottom side:
"170-29643 REV D"
It also has three stickers, one of them has the serial number and the other two have:
"SCH-29644 REV B"

"700-29644 REV X1"

As you can see I cannot clearly tell which revision of the board I have. Last but not least, the lwip example also says:
" The following boards are supported by this application:
- S32K148EVB-Q144"

My boards are S32K148EVB-Q176. To my understanding, that only represents the packing of the microcontroller. Does that mean that the lwip example will not work on my boards?

Any guidance will be greatly appreciated!

Best regards,
Jorge

[lukaszadrapa · Accepted solution]

Hi,

in short - your board is ready to go.

More details:

I can see the description talks about initial pre-production board marked as X-S32K148EVB-Q176. Marking of the schematic was SCH-29643. And yes, there were two versions A and C as described.

Production board is S32K148EVB-Q176 (without 'X' at the beginning) and marking of the schematic is SCH-29644. You have rev. B which is the latest. This revision B of 29644 board corresponds to revision C of 29643 when talking about R123, R96, R137 and R514.

R137 and R514 are placed, R123 and R96 are removed.

The description of the lwip example is obviously wrong. User guide shows correct description on page 7:

https://www.nxp.com/webapp/Download?colCode=S32K148-UM

And this corresponds to the schematic.

Regards,

Lukas

[jorge_cifuentes]

Hi Lukas,

Thank you very much for clarifying this and for the detailed explanation. I was one step from making these changes to my boards! From the user side, I think it would be better if NXP updates their documentation making reference also to the version of the board with the SCH code (e.g. SCH-29644 REV B) instead of just saying "REV A, REV C" as the "REV A, REV C" nomenclature is not clearly indicated on the physical boards.

Where can I submit a request to have the lwip example description updated so no more people like me get confused? hehe.

Thanks!

Best regards,

Jorge