TCAN330: the test result how to judge pass or fail?

Lawrence,

Please make note of the test conditions in the Switching parameters table when testing the transceiver timing. There needs to be 60 ohms termination and 100pF differential capacitance between CANH and CANL. In your circuit I see only 120 ohms termination and no load capactiance.

That being said, I'm not concerned with the timing values you have measured, but please try again with the correct loading conditions.

Regards,

Eric Hackett 

Hi, Support Team

here is our clinet measurment diagram as below chart:

if any, Please advise me.

Thanks,

Best regards,

Lawrence

Dear all, 
We measure all timing in system circuit, and it will be operated in actual situation.

So we need to judge the testing result is pass or fail.

Hi Lawrence,

The test results have no issue, however as Eric said, their testing conditions are different with the specification in datasheet. 

If possible, use the data sheet test condition (60Ohms, 100pF) and measure the loop delays to see if within the range.

Regards,

Sean

Dear Sean,

Thanks for your reply, but I can't understand the definition of spec, example for rising time typical 17ns as below red circle, 

What is the failed value for this parameter？

50ns is ok? even 100ns?  

Hi Mulder,

The rise and fall time was measuring the time it takes for the differential voltage to transition from 10% to 90% of its final dominant value. This was done on a simulated differential bus load of 60 Ohms and 100pF. No cabling, secondary transceivers, or other external loads were added. Because the test condition you described includes a different bus termination and load capacitance, the measured values are expected to be different from the typical values in datasheet. So we asked to measure these characteristics again with the setup I said above, if the purpose is to to verify datasheet values.

As we do not specify maximum values for these characteristics in the datasheet, it is difficult to say a pass/fail value. But even the test conditions were different, I don't see a significant deviation from the typical value in datasheet so I don't have concerns with the measurement results. In addition, I would recommend to measure the loop delays, as these are better defined in the datasheet with max value.

.

Regards,

Sean

Dear Sean,

Thanks for your reply.

Could you check the probe location is right or not in measurement point as below?

Hi Mulder,

Yes the probe location is correct. Ensure the bus loads match the datasheet test condition.

Regards,

Sean