i.MX ProcessorsのトピックRe: Do we need to control impedance of CAN BUS ?

Do we need to control impedance of CAN BUS ?

peteramond — Tue, 07 Aug 2018 06:27:07 GMT

Hi All,

My hardware design is most similar to nitrogen6_max development board and I have included CAN BUS port to my custom design which is similar to Sabre Lite board (CAN BUS).

In my memory layout I controlled impedance as 100 Ohms for differential pair and 50 Ohms for single ended signals.

I can see in Sabre lite schematic design CAN BUS is not differential pair. Is that correct ? Don't we need to control impedance of the CAN BUS traces ? If yes what is the impedance value ?

Regards,

Kulunu.

Re: Do we need to control impedance of CAN BUS ?

Yuri — Tue, 07 Aug 2018 09:42:20 GMT

Hello,

The standard specifies a two-wire differential bus; the characteristic line impedance is 120 Ohm.

The i.MX6 Design recommendations about 100 Ohms for differential pair is quite reasonable for FlexCAN

too.

Have a great day,
Yuri

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