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TCAN11625-Q1: IC is not communicating

Gopinath Gopalakrishnan
Prodigy 20 points
Part Number: TCAN11625-Q1

Tool/software:

Hi team , 

We are using TCAN11625 in one of project we kept the nSLP pin to high and left the nRST pin floating we did not getting the communication in the can lines , When i measure the voltages on nRST it is 5V, INH is 12V, Vccout is 5V and TS is 5V . could any one can help to me slove this issues i also tried the sequence by lowering the nRST pin and then raising the nSLP pin but still the same .

  • 0
    TI__Mastermind 28530 points

    Hi Gopinath,

    Have you also measured voltage of nSLP? Was VIO supplied in this case?

    Can you please include a waveform plots of CAN bus?

    Regards,

    Sean

  • 0 in reply to Sean Guo
    Prodigy 20 points

    Hello Sean ,

    The voltage at nSLP is 5V, i supplied VIO with 5V, TS pin output is 5V ,INH is 12V ,nRST is 5V and  i added a pulldown resistor to wake pin  , we are using the firmware that is developed for TCAN1044 , we have taken the TX and RX lines from the board after removing the TCAN1044 IC and given it to the TCAN11625 IC , we thought it should work but  whatever we  tried the CAN-H and CAN-L stays at 2.5V means it is recessive state 

  • 0 in reply to Gopinath Gopalakrishnan
    TI__Mastermind 28530 points

    Hi Gopinath,

    Your setup looks good to me, would you please capture TXD, nSLP, CANH, CANL signals using an oscilloscope so that we can see what's happening on the bus.

    Regards,

    Sean

  • 0 in reply to Sean Guo
    Prodigy 20 points

    HI sean , 

    Thanks for your reply 

    Below i have attached the scope images . I wonder why when i connected nSLP to 5V, the internal LDO (VCCout) i shooting to 6.5V . below in first image i have applied external 5V to Vio and nSLP . in the second image i have connected nSLP to VCCout . in both case i am not getting any output on CAN lines . kindly check the below images and let me know your thoughts 

     

  • 0 in reply to Gopinath Gopalakrishnan
    TI__Mastermind 28530 points

    Hi Gopinath,

    The CAN driver is disabled due to TXD DTO. Please see datasheet 10.3.13.1.

    Would you try to pull TXD low re-enable the driver?

    Regards,

    Sean

  • 0 in reply to Sean Guo
    Prodigy 20 points

    Hi Sean ,

    We did not tried to pull TXD low . But we have firmware that is constantly sending same data in the CAN bus . we used that firmware for TCAN1057 and TCAN1044 As per my understanding according to the datasheet 10.3.13.1 it is mentioned that the CAN transceiver is reactivated on the next dominant to recessive transition the TXD terminal . Below i have attached the scope screenshot of the data that we have captured for TCAN1044 with the same firmware time for each bit is 2us for the below shown image 

  • +1 in reply to Gopinath Gopalakrishnan
    TI__Guru 74292 points

    Gopinath,

    In your screenshots for the TCAN11625-Q1, there is no data being injected on the TXD line, hence no communication is occurring. Otherwise, it looks like CANH and CANL are biased to 2.5V, implying Normal mode, nSLP is high, and TXD is sitting in a high state. Can you try sending a waveform on TXD and see if it propagates to the CAN bus pins?

    Regards,

    Eric Hackett 

  • 0 in reply to Eric Hackett
    Prodigy 20 points

    Hi Eric ,
    Apologies for the late reply , i was little busy , Thanks for the suggestion . when i send some square wave in TX through signal generator , i got the output at CAN lines  . Now iam using Arduino giga R1 board to generate the CAN signals . seems the issue is with my older board firmware .