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TCAN1042HGV: Apply TCAN1042 for low frequency communication

Eric Lai
Expert 4940 points
Part Number: TCAN1042HGV

Hi Expert,

Would like to apply the TCAN1042 for low frequency communication

Conditions:

--Every 5ms will transfer a pulse through the TCAN1042 

--No defining of the pulse length 

Since this applicant is working well with TCAN1042.

Will need to have the support to clarify below items.

1) Due to there is TXD dominant timeout of TCAN1042,Pls advice limitations of this applicant.

2)May we know what is the minimum transmitted data rate? why need 11 in the equation (= 11 / tTXD_DTO) ? 

Thanks

Best regards,

Eric Lai

  

Field Application Engineer

Texas Instruments Taiwan Limited

O: +886-2-2175-2582

M: +886-909-262-582

E-Mail:Eric.Lai@ti.com        

  • 0
    TI__Guru 53555 points

    Hi Eric, 

    Due to the dominant timeout feature of TCAN1042 (and most CAN transceivers), the longest a dominant (logic 0) pulse can be is 1.2ms. There is no restriction for how long a recessive bit (logic 1) can last. It is possible to have the transceiver send a 1ms dominant pulse every 5ms which will satisfy the requirements you listed. 

    The minimum data rate listed on the datasheet (~10kbps) is based on what is allowed in the CAN protocol. As stated in this datasheet section, CAN does not allow for more than 11 consecutive dominant bits, thus defining the maximum dominant bit-width. Given the maximum dominant pulse-width of 1.2ms, the minimum bit rate can be calculated as 11 bits / 1.2ms = ~10kbps. For protocols other than CAN, you must determine what the maximum dominant bit-width is before you can calculate the minimum data rate. 

    Regards,
    Eric Schott