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TCAN1145-Q1: Meaning of tBais

Molly Wang
Prodigy 110 points
Part Number: TCAN1145-Q1


Hi Team,

My customer wants to know the  tBais meaning. Could you help share how is this parameter defined and understood? Thanks.

Best Regards,

Molly

  • 0
    TI__Mastermind 26826 points

    Molly,

    Thanks for reaching out! In Sleep mode, the CAN bus is biased to GND. In Standby mode, the CAN bus is biased to VCC/2 as a recessive level. This time is how long it takes for the bias to engage from the start of a WUP. Basically, it's clarifying that the CAN bus won't be guaranteed to be biased to VCC/2 when a WUP occurs until up to 250 µs has elapsed from the beginning of the WUP.

    Best,

    Danny

  • 0
    Prodigy 10 points

    We found that this parameter is 200us in another supplier's datasheet. Will my TCAN1145 being 250us have any impact on my application?

  • 0 in reply to gang.wang
    TI__Mastermind 26826 points

    Gang,

    It should not. CAN transceivers use the differential voltage between CANH and CANL to transmit and receive signals, so the difference between the two is the important consideration. After a WUP is generated, it is common for networks to implement some minimum wake-up time to allow all nodes in the system to wake up. This could be considered part of the wake-up process, but it is not 100% required for the bias to be active in order for valid signals to be passed on the bus.

    Best,

    Danny