topic LIN Communication in S12 / MagniV Microcontrollers

LIN Communication

LaZyMan — Tue, 22 Mar 2022 14:41:05 GMT

The motor controller we designed based on S912ZVML31 has LIN communication abnormality in the development process, which cannot be solved at present. The problems are as follows: In EMC BCI test, LIN line received interference and did not respond in low frequency band, mainly concentrated in the vicinity of 7-20mhz and 50MHZ. We also checked the hardware design but did not solve this problem, so I would like to know if it is the software level that causes this problem and whether it needs to be dealt with in the software. Whether this problem is related to the LIN TXD-Dominant timeout feature monitoring the LPTxD signal

Re: LIN Communication

danielmartynek — Wed, 23 Mar 2022 12:55:00 GMT

Hi @LaZyMan,

Can you read the LIN Interrupt Flags Register, or enable the LIN error interrupts LPIE?

Is the MCU otherwise working?

What is clock source of BUS_CLK?

Did you enable OSC clock monitor (CPMUOSC2_OMRE)?

Regards,

Daniel

Re: LIN Communication

LaZyMan — Wed, 30 Mar 2022 16:00:12 GMT

Dear Daniel

Sorry to reply you late.

After testing, we found that TVS caused this problem. If we remove TVS, the BCI test is OK. However, removing TVS will cause LIN Timeout error in other experiments, such as ESD. Do you have any good suggestions

Regards

Re: LIN Communication

danielmartynek — Fri, 01 Apr 2022 07:59:49 GMT

Hi @LaZyMan,

There is too little information, and this is out of scope of our technical support.anyway as this is an application issue.

ESD1 protection at LIN is optional (AN5207 S12ZVM HWDG)

BR, Daniel