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SN65HVD1050-EP -- what happens if transceiver has voltage applied but is not supplied

Roland Jeremies
Prodigy 10 points
Other Parts Discussed in Thread: SN65HVD1050-EP

Hi,

What happens to a CAN BUS transceiver SN65HVD1050-EP, if I apply approx 10V permanently on the CAN-L and CAN-H pins, even if the CAN BUS transceiver is unpowered?

Background: here we have TVS in front of the transceiver outputs; and we want to determine the breakdown voltage of that TVS devices. With respect to Ground, a voltage of +10V or -10V will be applied to the CAN-L and CAN-H connections. The transceiver is not powered during this test/measuring. During that measurements, the power supply are current limited by approx. 5 to 10mA.

The TVS have a nominal voltage of 5V (standoff voltage). I know that this is not CAN conform, but it is a dedicated point to point connection between 2 systems. There is no need to be compliant against the CAN BUS spec with -27V and +34V...

Hope you have some information relating that.

Kind regards

Roland