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TCAN4550: Interface - INTERNAL forum

NY
Expert 3040 points
Part Number: TCAN4550

Hi team, 

Customer have some datasheet question as below, 

1) Regarding 6.6, consumption current, would it be possible to provide both ISUP, IVIO comsumption current at no communication in normal mode? 

2) Regarding transition from Nomal to Sleep mode, is it possible interrupt WAKE singnal just after CMD established between Mode NOM-> SLP?

If possible, how the device is operating? As similar case, during above period, can we start sequence again by RST?

  • 0
    TI__Guru 52145 points

    Hi Naoki-san,

    1) When the transceiver is in Normal mode and not transmitting on the CAN bus, the CAN driver will remain in the recessive state. Therefore, the expected Isup current during this state will be the listed recessive specification. The Ivio will not change significantly based on CAN driver state, so this should remain largely unchanged from the datasheet specification while the driver is idle. 

    2) The WAKE input signal is active immediately after the command is written for the mode change to take place. If the device is reset, move to Standby mode. 

    Let me know if you have any more questions.

    Regards,
    Eric Schott

  • 0 in reply to Eric Schott1
    TI__Expert 3040 points

    Hi Eric, 

    Thank you very much for your answer. 

    For 2), customer want to clarify, ransition period Non to SLP will be cancelled by WAKE signal? or once transition completed then, WAKE signal will be active? 

    Best Regards, NY

  • 0 in reply to NY
    TI__Guru 52145 points

    Hi Naoki-san,

    The WAKE signal monitoring is active as soon as the SPI write to Sleep mode is complete (nCS goes high after SPI frame). After this, any valid WAKE input will cause the device to move to Standby mode. It is not needed for tMODE_NOM_SLP to elapse for this WAKE input to be recognized, only for the SPI command to be completed. 

    Regards,
    Eric Schott