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TCAN1145-Q1: Quality issue or tech issue? Cannot wake up TCAN1145.

Manu Chang
Intellectual 1980 points
Part Number: TCAN1145-Q1

Tool/software:

Hi,

My customers are facing a problem of one single chip of the TCAN1145-Q1, it cannot be waked up when there is wake up signal on the CAN BUS, as showed in figure1, yellow is the INH pin and blue is the differential signal between CANH and CANL. When doing the A-B-A tests, the failure went with this single chip. when comparing the to GND resistance of each pins, there is no big differences between the NG chip and the normal chip.

I write this email to ask: what kind of application situation that might cause this kind of non-wake up scenario? Or it seemed like more like a quality problem to you? 

Figure 1 failed one waveform

Figure 2 Normal one waveform

BR,

Manu

  • 0
    TI__Mastermind 27620 points

    Hi Manu,

    Are they using WUP or selective wakeup?

    What is the CANINT status when receiving wakeup signal?

    Regards,

    Sean

  • 0 in reply to Sean Guo
    TI__Intellectual 1980 points

    Hi Sean，

    Sorry for the delay, they are using the selective wakeup to wake up in the specific frame. For CANINT status their quality team are not able to read them for the failure chip.

    Currently the chip have passed the ATE tests of TI and are facing to do the bench tests, could you help on suggesting which root cause could be from application side?

    BR,

    Manu

  • 0 in reply to Manu Chang
    TI__Mastermind 27620 points

    Hi Manu,

    Manu Chang said:
    For CANINT status their quality team are not able to read them for the failure chip.

    So they are not able to use SPI to read chip registers? Does that only happens on the failed chip or any TCAN1145-Q1 chip? If they cannot use SPI how do they enable and configure the selective wakeup?

    Regards,

    Sean

  • 0 in reply to Sean Guo
    TI__Intellectual 1980 points

    Hi Sean,

    There should be a misunderstanding, I mean that their quality team haven't read the status of the failed chip in that case and they have sent the failed chip to us for the ATE tests, which passed and is waiting for the bench tests. So they don't have the INT status data of the failed chip. The SPI worked normally for the failed chip according to them, only thing is cannot wake up. 

    Also, their quality team is also not so familiar with the software so they didn't check them in the first place. 

    BR,

    Manu

  • 0 in reply to Manu Chang
    TI__Mastermind 27620 points

    Hi Manu,

    Understood, if ATE passed I would expect the chip is still in good condition, it's more likely their software didn't configure selective wakeup correctly.

    For bench test do you want TRX to do it? If so please send an email to TRX so we will assgin the task to someone in our team (I will most likely be the person to do it but just make sure we have the correct QEM information). I will close this thread for now so we can move to email.

    Regards,

    Sean