[TJA1027][TJA1021]pin LIN of Lin transceiver is LOW level when Lin bus idle

[WYoung]

Setting pin SLP_N=1 first, then init Lin Channel. After sending data(Lin bus idle), pin LIN is low level for a while like this picture:

And if I init Lin Channel first, and then set pin SLP_N=1,this situation will not heppen.

Could you tell me why this happens?

[TomasVaverka]

Hi Wuyang,

1. Is blue signal TXD? The conflict between Lin initialization procedure and Lin network is reflected on the Lin signal.

2. This procedure is correct.

Could you tell us which specific Lin transceiver you are using and which project you are developing?

Best regards,

Tomas

[WYoung]

Hi Tomas,

Thanks for reply.

1.Is blue signal TXD

2.why this situation(Lin bus signal keep low level for a while when Lin bus is idle) happens?

3.I cannot understand the conflict you said. Besides, I cannot find relevant information form user manual to explain this situation.

4.which procredure is correct?

Setting pin SLP_N=1 first then init Lin channel or init Lin channel first then setting pin SPL_N=1 ?

5.We are using TJA1027 and TJA1021 to devepol a automobile MCU project.

BRs,

Wuyang