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I am using S32K358 with FS2633. When I test only the FS2633 section (MCU removed), the RSTB is released (HIGH) and the 3.3 V rail is present.
After assembling the MCU and all components, RSTB stays LOW, and the MCU does not boot.
If I connect a JTAG debugger, RSTB goes HIGH, I can successfully program the MCU, and the application runs normally. However, once I disconnect the JTAG, RSTB goes LOW again and the MCU stops running.
One observation is that the FS2633 RSTB output is a 3.3 V signal, while the S32K358 RESET line is pulled up to 5 V on my board. Despite this voltage difference, the system works correctly whenever the JTAG debugger is connected. Could this reset voltage level or the debugger be influencing the reset or power-up sequence?
Could this issue be related to the power-up sequence, reset timing, FS2633 startup configuration, or debugger-related behavior? Has anyone experienced a similar issue or have suggestions for debugging?
You'd better try to test by pulling up the FS2633 RSTB to 3.3 V and check whether this issue has or not.