MR-CANHUBK344 all LED flash when power on

[Andy1357]

Hi I am using MR-canhubk344, and I found when I power on the eval board, the LED (D24 D25 D26 D28 D29 D34 D43)will all flash, and I cannot download and do anything. Then I plug out and plug in again, everything looks good. This issue only occurred  when the first power on. Is there anything wrong? THank you

[Robin_Shen]

Hi

Please note the chapter 5.2 Note on PMIC and board power up sequence of MR-CANHUBK344 Hardware User Manual

The FS26 onboard PMIC by default implements a challenger window watchdog that will reset the S32K344 MCU continuously if the challenge is not handled in software.
To avoid this, the FS26 must be put into debug mode. This is done by removing the JP1 and then supplying exactly 12.0V on P27 or P28 and then inserting the JP1 jumper.

Now the reset LED D24 should no longer blink and the S32K344 will not be reset continuously by the FS26.

Best Regards,
Robin
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