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TCAN4550-Q1: How to turn of the internal LDO or supply to the internal CAN transceiver through Register configuration

DARSHAN M M V
Intellectual 265 points
Part Number: TCAN4550-Q1

Tool/software:

How toHello team ,

we are planning to turn off the internal LDO or supply line that will power the CAN transceiver when our Micro controller detects the over voltage .

Is there a option to turn off the internal supply so that Bus voltage will be zero by configuring the registers through SPI.when our UC detects the over voltage .

  • 0
    TI__Mastermind 33090 points

    Hello Darshan,

    The only way to disable the internal LDO is to place the device into Sleep Mode.  Otherwise the internal LDO will always be active and can't be independently enabled or disabled through the SPI registers.

    However, if your only concern is with removing the recessive level bus bias voltage, then you could simply place the device into Standby Mode which will change the bias voltage from 2.5V (VCC/2) to GND.

    Regards,

    Jonathan

  • 0 in reply to Jonathan Nerger
    Intellectual 265 points

    Hello Jonathan,

    Thanks for providing the feedback,

    I have few questions w.r.t TCAN,

    what will be the frequency of CAN signals when the DATA rate 2mbps ,?

  • 0 in reply to DARSHAN M M V
    TI__Mastermind 33090 points

    Hello Darshan,

    The message transmission frequency, or how frequently a CAN message is transmitted on the bus is completely independent of the Nominal and Data Bit Rate configuration.  The 2Mbps Data rate is just the bit rate, or rather the bit period, of the bits within the messages.  Each CAN Node controller will need to be configured to the same to know when and how to sample the bits when a message arrives on the bus.

    But a CAN message is only transmitted when an MCU on the bus decides to transmit the message.  There may be frequent messages that get sent with only the minimum interframe interval (11 nominal bit periods), or there may be long idle times when no MCU nodes need to transmit a message.

    Therefore the frequency of CAN messages will be dependent on the system and I can't tell you what your system requirements are, or how frequently messages will be transmitted.

    Regards,

    Jonathan