Reset port issue

[jtpark]

Greetings,

I made my board by using S32K144UAVLH.

but RESET port occurred error event.

please refer to the attached.

When I constructed empty mcu to my board, I found issue of RESET port.

After that I programmed the example project(hello_clocks_s32K144) of board,

The RESET port still has a problem.

For example, The RESET port periodically falls and rises .

Can you tell me how to solve this problem?

Please help for this.

Thanks.

[danielmartynek]

Hello,

I would recommend AN12130 Production Flash Programming Best Practices for S32K1xx MCUs.
https://www.nxp.com/docs/en/application-note/AN12130.pdf

This one of the common problems mentioned in Section 5 of the AN.
When the flash is blank, the MCU keeps resetting itself due to core lockups.

The capacitance (10us) is too high.
Please refer to AN5426 Hardware Design Guidelines for S32K1xx Microcontrollers
Section 5.2.1 External pin RESET.
Capacitors smaller than 330 pF are recommended.

If the debugger tells you the project has been programmed successfully, there might be some SW issue.
Could you please load a very simple project or the default empty S32DS project and monitor the reset pin?
I mean a project that does not reconfigure clocks, power modes etc.

Regards,
Daniel