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TCAN1044V-Q1: NC pin of TCAN1044V-Q1

Rogers Chen
Intellectual 825 points

Part Number: TCAN1044V-Q1

Dear TI CSC，

I noticed that PIN5 of TCAN1044V-Q1 has two different definitions, NC and IO supply voltage. So what is the result of leaving PIN5 floating? Or if we use TCAN1044V-Q1 do we have to connect supply voltage to this pin? Thanks!

  • 0
    TI__Guru 53555 points

    Hi Rogers,

    The TCAN1044 (non-V) has a true electrical no connection on pin 5, so leaving this pin floating or connected to Vcc or GND has no functional impact.
    TCAN1044V uses this pin as it's logic-level supply input and needs to be connected to Vio (1.8V, 3.3V, or 5V for example) in order for the device to function. This supply is used to drive the RXD output and sets the input threshold for the TXD pin. 

    For applications where logic level translation is not necessary, it may be suitable to connect pin 5 to Vcc to allow for both device versions to be used. 

    Let me know if you have any more questions. 

    Regards,
    Eric Schott

  • 0 in reply to Eric Schott1
    TI__Intellectual 1990 points
    Eric Schott1 said:
    For applications where logic level translation is not necessary, it may be suitable to connect pin 5 to Vcc to allow for both device versions to be used. 

    Hi Eric,

    Is this comments also correct for TCAN1051 AND TCAN1051V? namely TCAN1051 NC pin can connect to Vcc which share the same pcb design with TCAN1051V?

    Thanks!

  • 0 in reply to Terry Liang
    TI__Guru 74262 points

    Terry,

    Yes, that is correct.

    Regards,

    Eric Hackett