About LTC2875 data rate

Can LTC2875  communicate at 250 Kbps?

What is the data range?

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  • +1
    •  Analog Employees 
    on Jul 15, 2020 7:24 PM 6 months ago

    Hi ilgin07, 

    The LTC2875 is maximum data rate is 4Mpbs per the datasheet. 

    A TXD line shorted to ground or malfunctioning CAN controller can allow a single node to indefinitely prevent further CAN bus traffic. To eliminate this problem, the LTC2875 has a TXD Timeout Time (tTOTXD in the datasheet) feature. The timeout limits the time a malfunctioning node can tie-up a bus, but it also has the effect of limiting the minimum data rate.  

    Under normal operation, the CAN protocol allows five consecutive bits of the same polarity before stuffing a bit of the opposite polarity into the transmitting bit sequence. When an error is detected, the CAN controller purposely violates the bit stuffing rules by producing six consecutive dominant bits. At any given data rate, the CAN controller must transmit as many as 11 consecutive dominant bits.

    The tTOTXD datasheet minimum is 0.5ms. 250kbps is a 4us bit width, so yes, the LTC2875 can communicate at 250kbps. 

    Regards,

    Jason 

Reply
  • +1
    •  Analog Employees 
    on Jul 15, 2020 7:24 PM 6 months ago

    Hi ilgin07, 

    The LTC2875 is maximum data rate is 4Mpbs per the datasheet. 

    A TXD line shorted to ground or malfunctioning CAN controller can allow a single node to indefinitely prevent further CAN bus traffic. To eliminate this problem, the LTC2875 has a TXD Timeout Time (tTOTXD in the datasheet) feature. The timeout limits the time a malfunctioning node can tie-up a bus, but it also has the effect of limiting the minimum data rate.  

    Under normal operation, the CAN protocol allows five consecutive bits of the same polarity before stuffing a bit of the opposite polarity into the transmitting bit sequence. When an error is detected, the CAN controller purposely violates the bit stuffing rules by producing six consecutive dominant bits. At any given data rate, the CAN controller must transmit as many as 11 consecutive dominant bits.

    The tTOTXD datasheet minimum is 0.5ms. 250kbps is a 4us bit width, so yes, the LTC2875 can communicate at 250kbps. 

    Regards,

    Jason 

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