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TCAN4550: TCAN4550RGYRQ1 high current consumption

Jagadeesh reddy
Prodigy 30 points
Part Number: TCAN4550

we have used TCAN4550RGYRQ1 for one of my project so when we measure sleep current it's consuming 2.5ma which is not recommended so can you please suggest solution for higher current consumption

  • 0
    TI__Mastermind 32960 points

    Hi Jagadeesh,

    How are you measuring sleep current?  Are you including additional current paths from components outside the device such as pull up or pull down resistors?  Also, are you supplying VIO while the device is in sleep mode?

    The sleep mode current is a characterized parameter and specified in the datasheet.

    Regards,

    Jonathan

  • 0 in reply to Jonathan Nerger
    Prodigy 30 points
    Hi Jonathan,

    We are measuring current in 6V path line which is going to only CAN & Battery charger section attached images for reference.
          Standby mode - 2.6mA
          Sleep mode      -2.3mA
    After removing R28(VCCIO is removed in CAN)
          Standby mode - 1.67mA
          Sleep mode      -2.3mA
    - >Battery charger was consuming 0.85mA.
    ->Removed input 6V supply for battery charger . CAN IC alone current consumption as below.
          Standby mode - 0.95mA
          Sleep mode      -1.21mA
      
    Note: After 4 minutes we not getting 5V at VCCOUT pin so consider that as sleep mode.               
          
          

  • 0 in reply to Jagadeesh reddy
    TI__Mastermind 32960 points

    Hi Jagadeesh,

    The device will enter Sleep mode if it has not been configured and had the PWRON flag cleared within 4 minutes.

    I'm a bit confused by your results that show the current in Standby mode is less than the current in Sleep Mode.  This should never be the case.  Just one of many reasons this is the case is that the VCCOUT (5V LDO) is ON in Standby mode, and OFF in Sleep mode.  Even without a load on VCCOUT, the voltage drop in the LDO would create a larger current draw in Standby mode.

    I see the VIO is connected to VCCOUT and also goes to a port called VCAN.  What is connected to VCAN and could it be drawing current?

    The device's Sleep Mode current spec states that the SPI bus, OSC/CLKIN be disabled which is done by VIO = 0V.

    Is the SPI bus disabled while you are measuring the current in Sleep mode?

    How long are you waiting after the device enters Sleep mode before making your measurement?  Because you have VCCOUT connected to VIO that also has a 10uF cap that could be holding charge, it's possible that the VIO rail still has enough power to keep the crystal oscillating for a period of time that could have some amount of impact on the measurement.  Can you check that the C22 (10uF) is discharged and the crystal is not oscillating when you make the measurement?

    What is connected to the nWKRQ pin and the CAN_WKRQ port?  When the device enters Sleep Mode, the nWKRQ pin drives high to approximately 3.6V.  If there is a load on this pin, it could add to the current draw in Sleep Mode.

    I didn't really see anything else from the schematic that looked like it would be drawing additional current.

    Regards,

    Jonathan

  • 0 in reply to Jonathan Nerger
    TI__Mastermind 32960 points

    Hi Jagadeesh,

    Do you have any updates or questions, or is this issue resolved and I can close the thread?

    Regards,

    Jonathan