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Original question:

TCAN1043-Q1: TCAN1043-Q1

TCAN1043-Q1: Urgent case | TCAN1043-Q1 test issues

Hangjie Wang
Intellectual 1210 points
Part Number: TCAN1043-Q1

Tool/software:

Hi expert,

my customer meet a TCAN1043-Q1 test issues, which need your help.

Problem description:

When the customer does the following tests, it is found that the test results do not meet the requirement to recover within 200ms after the fault has disappeared.

  • COML short to power,  
  • COMHL short to power,
  • COMH short to GND,
  • COMHL short to GND,
  • COMH short to COML
  • Lose Power
  • Lose GND

For the test result and sch pls check the email.

Form my understand, the device will recover after four consecutive dominant-torecessive transition, could you pls help me check what is the potential reason, and whether we have the test report for CAN consistency at Physical layer, thanks.

 

  And if customer pull up the EN to 5V,which is always on, whether it will affect below State Machine? Such as can not enter Silent mode?

  • 0
    TI__Mastermind 27690 points

    Hi Hangjie,

    I didn't see the email you sent, who did you sent to? I'll assign this thread to the engineer you contact.

    When you said "recover", you mean the fault flag was not cleared (nFault= Low) after bus fault disappeared?

    Please note the CBF flag will not be automatically cleared in 200 ms after no bus faults, as you can see from the datasheet, the condition to clear the flag is 

    • Leaving normal mode
    • no CAN bus fault is detected for four consecutive dominant to recessive transitions of the TXD pin while in normal mode.

    What is the nFAULT state after fault disappeared? Do you have a capture of nFAULT and TXD?

    Hangjie Wang said:
      And if customer pull up the EN to 5V,which is always on, whether it will affect below State Machine? Such as can not enter Silent mode?

    Yes, the effect will be not able to enter silent mode. And once the device enters go-to-sleep mode, it will not be able to transition to standby mode by pull EN low.

    Regards,

    Sean

  • 0 in reply to Sean Guo
    TI__Intellectual 1210 points

    Hi Sean,

    Thanks a lot for your support, i have shared the email for you.

    Could you pls help check whether we have the test report for CAN consistency at Physical layer?  from my understand the device will keep at normal mode unless TCAN1043-Q1 will leaving normal mode by itself, customer do not have SW config when did the test. The test equipment can only provide below waveform when do the COMHL short to GND test, pls check it.

  • 0 in reply to Hangjie Wang
    TI__Intellectual 1210 points

    is it related to the use of EN pin？

  • 0 in reply to Hangjie Wang
    TI__Mastermind 27690 points

    Hi Hangjie,

    Thanks for your sharing, but I still need more information to understand the problem.

    We have C_S conformance test report available on seismic. And you are correct, the device will remain in normal mode unless EN or (and) nSTB being pulled low, or there's under voltage condition on VCC/VIO will set the device into sleep mode.

    CTRL is nFAULT signal, am I correct? If so when it's pulled high meaning the fault flag has been cleared. At this time the CAN bus also went back to the common mode, so it could be confirmed no fault on bus. My questions are:

    1. Was the transceiver transmitting or receiving message? Please include TXD and RXD signals.

    2. What's the EN and nSTB status? We need to check if the device was in normal mode because only in normal mode the driver is enabled.

    Please use an oscilloscope to capture those signals, for example, you can probe on TXD, RXD, nFAULT, and either CANH or CANL. 

    Regards,

    Sean