VPP_TEST FCCU Configuration

[ahmedsoubky]

Greetings, 

I was wondering how to configure the FCCU to monitor the VPP_TEST pin to ensure that it is kept low ? 

Thanks in advance, 

Best Regards,

Ahmed Soubky

[ahmedsoubky]

Hi Peter,
Thanks for the answer. 
We are using MPC5744p micro. 
Furthermore, there is a requirement to configure the FCCU to monitor the VPP_TEST pin to ensure it is kept low. 
Is it enough to configure a reset reaction to the faults 40,41,42, and 43 in the FCCU ? 
Kind Regards, 
Ahmed

[petervlna · Accepted solution]

Hi,

Yes, these faults are there exactly for this purpose.

Furthermore they monitor also unintended TEST mode entry due to other various reasons like MC_ME failure.

I recommend you to configure reset reaction on all TCU faults (40 -43) as TEST mode should be used only during factory testing.

Peter

[ahmedsoubky]

Thank you very much!

[petervlna]

Hi,

FCCU can't monitor VPP_TEST pin. FCCU can monitor only faults described in FCCU chapter as NCFs.

But you didn't even specify your micro, so...

Just tie it to the ground.

Peter

[petervlna]

Hi,

Now I realized that there is no need to monitor this pin as FCCU monitor unexpected activation of TEST mode.

You can find more details here:

http://www.nxp.com/assets/documents/data/en/application-notes/AN5259.pdf?&fsrch=1&sr=1&pageNum=1 

Peter