uja1169 reset issue

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uja1169 reset issue

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949147417
Contributor I

Hello, I used S32K146 and UJA1169TK/F for Automotive project, after I programmed the S32K146 MCU, the first power cycle,our board can work normally, but in the next power cycle, SBC will reset MCU by 128ms period. MCU power supply is OK, why SBC reset MCU, watchdog is refreshed by SPI. Thanks, Can you help me?

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razva_tilimpea
NXP Employee
NXP Employee

Hi,

Could you describe how do you use the power cycles?

Best regards,

Razvan

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949147417
Contributor I

hello,after programmed the micro,remove JTAG

the first time power on the PCBA we build,sbc did not have reset issue,but the second power cycle SBC will Reset mcu

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razva_tilimpea
NXP Employee
NXP Employee

Hi,

First time when SBC is delivered it is in FNMC (watchdog is disabled). Probably first time when you flash the board everything is fine because the time between switching from FNMC to normal mode and watchdog feed is small enough to avoid reset.

Next time when you power on the board the SBC will be in normal mode and it expects to be feed after 128ms from power on. Please be sure that first feed event occurs in time.

Best regards,

Razvan

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949147417
Contributor I

great,we check the code and solve it,thanks

-Original-

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