UJA1135 (UJA113x) reset pin oscilates

[aliazidehak]

Hello,
I have used uja1135 (3V version) in my design. I have not programmed my MCU yet, but the reset pin of the SBC oscillates and don't go to logic 1 (shown in attached pictures). The on-time of reset pin is less than 1 us and the period is around 125 us. I have both 3.3V and 5V in my system. I have 20 boards and all are the same. Has anyone had this problem before?

Thanks

[guoweisun]

Hi,

Could you please give us schematic about your applcaition?

[aliazidehak]

The problem was not from the UJA1135. I was using S32k micro controller and it seems that without programming the flash, it keeps the RSTn line low.

[guoweisun]

Hi,

If this issue is about S32 MCU,so please submit a ticket about S32 MCU,because I can't support MCU.

Sorry about that!

[aliazidehak]

Hi,

It is not actually a problem, but it is how S32k micro-controller has been designed. Therefore, there is no problem in the system at all.

Thanks