MC33660 for OBDII to support ISO9141

[kyleyang]

Hi experts

It is my first time to design a Kinetis MCU + MC33660 for OBDII application.

According to MC33660 datasheet, only support K-Line for OBDII and L-line is an option.

Is there anyone have OBDII design experience?

I don't know how to use or design L-line for OBDII.

Thanks.

[xiangjun_rong]

Hi, Kyle,

I suggest you download the user guide of MC33660 EVM board, maybe it can help you to understand the K-Line for OBDII, unfortunately, i have not experience for the K-Line design.

EVK MC33660 ISO K Line Serial Link Interface|Freescale

BR

Xiangjun Rong

[kyleyang · Accepted solution]

Hi Xiangjun Rong

Thanks, I have download it.

But I found something strange regarding the ESD protect part "MMBZ27VCLT1".

The reference schematic tie the Pin 1 to 2, but the typical usage is tie pin 1 to 3 or pin 2 to 3.