Team, with TCAN332 Vcc at 3.3V, can 12V be applied at CANH (pin7)? The differential voltage (CANH-CANL) would be 12-0=12V.
It seems to fit the datasheet specs, but wanted to verify.
Thanks!
Viktorija
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Team, with TCAN332 Vcc at 3.3V, can 12V be applied at CANH (pin7)? The differential voltage (CANH-CANL) would be 12-0=12V.
It seems to fit the datasheet specs, but wanted to verify.
Thanks!
Viktorija
Hi Viktorija,
Yes, it is OK to have CANH at 12 V (or any voltage within the +/- 14-V maximum specification) while CANL remains at 0 V. Just be careful if this is a "hot plug" test that overshoots that can occur at the time of connection as a result of cable inductances do not violate the maximum voltage specification.
Regards,
Max
Max, follow up question:
So do we need to use 120 Ohm terminal resistance between the CANH and CANL pins? Or is this something that is already present in the internal circuitry of the TCAN332 chip? I couldn’t really find this information on the datasheet.
Thanks
Viktorija
Viktorija,
There is no termination circuit internal to TCAN332, so this must be implemented externally. Typically CAN buses will use two 120-Ohm resistances, one at each furthest end of the bus. For further reading on CAN termination, you can reference this blog:
Best regards,
Max