This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCAN1145-Q1: Meaning of tBais

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

  • 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

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

  • 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