Hi team,
I find that the other device datasheet has the application system description as below. But we don't have similar description. So is TCAN1044 suitable for 12V and 24V system?
And what spec do we use to refer? And do the 12V system/ 24V system refer to power railway? Or communication railway?
Hale,
Please consider the TCAN1044A-Q1 in place of the TCAN1044-Q1 (but my answer applies to both).
I am assuming this is the TJA1042T data sheet you included. It looks like you might have attempted to upload a second image, but it did not work. However I think I get your question regardless.
Yes, we are capable of doing so. The TCAN1044A-Q1 calls this out specifically in the data sheet:
You might be referring to the older TCAN1044-Q1. That data sheet also called out the ±58 V bus fault protection, which implies that it is suitable for both 12 V and 24 V applications.
And what spec do we use to refer? And do the 12V system/ 24V system refer to power railway? Or communication railway?
For the 8-pin CAN devices, this refers to the capability of the CANH/CANL pins. However, normal CAN communication is on the order of 5 V (VCC). The reason this is needed is because of the possibility in a system that the CANH and/or CANL lines are accidentally connected to battery in use (maybe by a mechanic or during assembly).
In a car, "load dump" refers to the phenomenon where battery voltage spikes during ignition. In a 12 V system, this is clamped usually around 35 V to 40 V, while in a 24 V system it could be clamped up to 58 V. So, this means that the CANH and CANL pins can survive the worst-case situation of being accidentally shorted to battery supply during load dump.
Best,
Danny
