RE: CAN-H and Vbatt Short

Have you only your Fujitsu CAN device on the bus?  You _must_ have at
least two nodes or it isn't a CAN bus.

John Dammeyer



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-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
PDE-Elect - Software Team 1
Sent: Monday, December 17, 2012 11:02 PM
To: 'CANLIST'
Subject: [CANLIST] CAN-H and Vbatt Short



Hi Techies,

I am facing one issue in my CAN-physical layer design.

I am using Fujitsu micro. I have a CAN messages only for Tx from my micro.
No Rx messages for my system.

When i am shorting CAN-H line and Battery voltage(11V to 14 V) line, my
controller generates the "Error passive" error.

Why this is happening.? And my design validation team doesn't agree this
point.

And then Error Passive doen't recover back to Error Active State even if i
removed the Short.

Pls help me out Is there any protection circuit vailable to avoid "Error
passive " State. Or If it happens in protocol suggest me some documents
for reference..

Regards,

BoopathiRaja.G