LIN error when supply voltage is below 7v

[liuxing_hu]

MCU: s32k118

SBC: TJA1128

LIN stack is generated by s32ds using LDF

when supply voltage is below 7v, LIN error happened, but sbc normal work voltage is [5.5, 28]v

liuxing_hu_0-1651057972563.png

is it possible that software configuration cause this problem?

[PetrS]

Hi,

maybe SBC stays in CONFIG mode somehow or similar.
You have to distinguish between Config mode (mode where you initially program the SBC after first power up into the MTP Memory) and the Port mode (allowing diagnose/read some registers for wakeup source and status). These modes shall not be confused. Fig 5 and  6 in DS shall tell you weather you were in Port mode or Config mode. 
If the SBC has been programmed previously, the factory presets may need to be restored before reprogramming can begin. The MTP memory has a write counter to assess how often it has been configured.  When you configure it you need to close the write operation it with a correct CRC, otherwise you will not get out of Config mode. More info is in chapter 6.3.4.1 Programming of MTPNVM of the DS.

BR, Petr