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Sharing one CAN BUS transcievers among two CAN controllers

O

Ofer_Lapid

Jan 1, 1970
0
I am playing with an idea to design a board with two can controllers
and wish to have them share on CAN transciever in a sort of wired-or
arrangement.
I will use the philips transciever.
Any advice will be apreciated.
Ofer
 
M

mkaras

Jan 1, 1970
0
Ofer_Lapid said:
I am playing with an idea to design a board with two can controllers
and wish to have them share on CAN transciever in a sort of wired-or
arrangement.
I will use the philips transciever.
Any advice will be apreciated.
Ofer


This is feasible as long as:
1) You have the two devices with separate CAN addresses for each
2) You add logic to the board such that transmit output pins (the
serial output lines) from the two CAN controllers are ORed properly so
that you do not have logic level contentions between the two signals.
At the worst case this second would require some additional transmit
enable signal from the two CAN controllers that will enable the
respective transmit output pin to the CAN bus transceiver.

- mkaras
 
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