SN65HVD230: Device Failure

Mark Major

Prodigy 65 points

Part Number: SN65HVD230
Other Parts Discussed in Thread: ESD2CAN24-Q1, ESD2CAN36-Q1

Tool/software:

Using the SN65HVD230DR CAN transceiver with an MCP2515 CAN controller.

This is successful past circuit being used in a new application.

Running both chips from 3.3V from a RasPi4 compute module.

Wiring and connections are all verified correct.

With CAN bus open circuit, didn't find any problems after numerous power cycles (while testing other circuits on the board).

The CAN bus is only used for point-to-point communications with a CAN motor controller (CubeMars AK Series).

After making the CAN bus connection, our CAN transceiver chip immediately failed on first power-up, and also seems to have taken out the CAN motor controller.

Our chip now measures 2.5 ohms between the Vcc and ground pins.

Replacing with new chip on our board, it seems okay but haven't tried connecting to our remaining good CAN motor controller yet (gun shy).

Could the fact that the RasPi4 3.3V output is delayed about 150 ms have anything to do with the failure?

The motor and controller are powered up coincident with the RasPi, but our CAN circuit only powers up 150 ms later.

Thanks,

Mark

4 months ago

0 Sean Guo 4 months ago

TI__Mastermind 18380 points

Hi Mark,

I don't think the power up delay can damage this device.

Do you have a schematic could be share? Most times when the device gets damage is from electrical overstress when a voltage transient occurs. And you said VCC measures 2.5Ohms, can you please check if there was transients or surges on 3.3V output?

Regards,

Sean

0 Mark Major 4 months ago in reply to Sean Guo

Prodigy 65 points

Hi Sean. I can send you more info. What is your email address?

Mark

0 Sean Guo 4 months ago in reply to Mark Major

TI__Mastermind 18380 points

Hi Mark,

Please send to s-guo2@ti.com

Regards,

Sean

0 Mark Major 4 months ago in reply to Sean Guo

Prodigy 65 points

As I mentioned in the email, we hooked it up to our other motor controller and it seems to be working just fine. But of course we are still worried about why it failed the first time. You had mentioned about using a TVS diode for protection across the CAN bus, which sounds like a good idea. Do you have a particular part in mind that you would recommend for these applications?

Thanks,

Mark

0 Sean Guo 4 months ago in reply to Mark Major

TI__Mastermind 18380 points

Hi Mark,

TI has ESD2CAN24-Q1 designed specifically for CAN application, that's usually we would recommend to use in a 12V system. There is also ESD2CAN36-Q1 for 24V system.

Regards,

Sean

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SN65HVD230: Device Failure