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TCAN1043G-Q1: bypass cap on VIO and Vcc

Given Ding
Genius 10205 points
Part Number: TCAN1043G-Q1
Other Parts Discussed in Thread: TCAN1043

Hi Team,

two questions on TCAN1043. 

1. if VIO and Vcc are connected together, do you think we can just use 1x100nf totally? datasheet mentioned 1x100nf on each pin. 

2. as you recommended in e2e, WAKE is connected to Vsup if not used, rather than connect to GND. So if WAKE pin is connected to Vsup, since its internal circuit is also connected to Vsup, then no leakage current consumption, right ? 

3. as you mentioned in e2e, on TJA1043, there is SPILT pin which need connect to a cap. And our part is not needed. But if NC pin is connected to a cap, will it bring negative effect? 

Thanks. 

  • 0
    TI__Guru 62920 points

    Hi Given,

    The device will work with a shared capacitor on VCC and VIO.  The EMC testing we have conducted mostly uses separate capacitances on each pin, though, and so you may see a slight degradation in things like RF emissions when using a single capacitance.  If this is a major concern for your application, you may want to follow the standard guidance of a capacitor on each.

    You are correct that there will be minimal leakage into the WAKE pin when it is tied to VSUP, since internally it will configure itself to pull to VSUP as well.

    There are no negative effects associated with connecting the NC pin to a capacitance.  This pin is not connected internally in our device.

    Please let us know if you have any further questions.

    Regards,
    Max