TCAN1042HV-Q1: Bus Fault protection ±70 V condition

Kevin Huang8

Genius 5296 points

Part Number: TCAN1042HV-Q1
Other Parts Discussed in Thread: TCAN1042H

Hi Team,

When I add 60V voltage from the CANH and CANL pins, it will burn out. What is the test protection conditions for ±70V?

over 2 years ago

0 Eric Hackett over 2 years ago

TI__Guru* 75392 points

Kevin,

Are you applying the voltage to each CANH and CANL relative to GND? The device should survive up to 70V from CANH to GND or CANL to GND indefinitely.

Regards,

Eric Hackett

0 PYTsai over 2 years ago in reply to Eric Hackett

TI__Genius 12370 points

Hi Eric,

Yes, we apply the voltage to each CANH and CANL relative to GND.

May I clarify the correct set up for this 70V bus fault test.

1. do we need to power on the TCAN1042H ?

2. Do we need give "H" or "L" level to TXD pin

+1 Eric Hackett over 2 years ago in reply to PYTsai

TI__Guru* 75392 points

PY,

The device shouldn't need to be powered on for the 70V protection to work. And the state of the TXD pin shouldn't matter. As an experiment, can you try with the power on? And can you also capture the voltage on the pin as the power supply is turned on with an oscilloscope? I'm curious if there is a voltage spike initially that goes over 60V before settling, and maybe this is causing some damage.

Regards,

Eric Hackett

+1 PYTsai over 2 years ago in reply to Eric Hackett

TI__Genius 12370 points

Hi Eric,

Thanks for your support, we found the root cause. Customer had mounted the wrong device. It is not TCAN1042H

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TCAN1042HV-Q1: Bus Fault protection ±70 V condition