SN65HVD234-Q1: Interface forum

Devis Fracassi

Prodigy 185 points

Part Number: SN65HVD234-Q1

Dear all,

I need to connect 2 devices with canbus interface.

I have no ground reference. There are available only the CanH, CanL and Power+ pins.

How can I connect them in order to exchange can messages?

The positive pin of the first device is at 42 Vdc from its internal ground.

The positive pin of the second device is at 30 Vdc from its internal ground.

Can I connect the positive line and choose a canbus driver +/-15V common mode tollerant?

Any your help is very appreciated. Best regards.

Devis

over 4 years ago

0 Max Robertson over 4 years ago

TI__Guru 62910 points

Hi Devis,

What you describe seems to make sense - if the DC regulators are operating as expected, you would essentially have a 12-V common mode shift. If the transceiver could communicate across a 12-V common mode range, then, the data should make it through the link. You may want to verify the ground potential difference you actually get with this sort of set-up in order to validate the assumptions, though.

Max

0 Devis Fracassi over 4 years ago in reply to Max Robertson

Prodigy 185 points

Thank a lot for your support.

Regards.

Devis