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TCAN1043G-Q1: Vsup connection to Vbat with a resistor

user6340460
Prodigy 60 points
Part Number: TCAN1043G-Q1

Hi TI expert,

In your datasheet, there is a resistor between VBAT and Vsup pin.  And in some Tier1's products also have a resistor.

what is it used for?

what is the value? 

Can I delete this resistor?

But in EVB, there is a diode. So whether need a resistor in automotive application? 

Thanks a lot!

  • 0
    TI__Guru 62920 points

    Hello,

    The images in your post didn't come though, but I think I understand your question anyway.

    A series resistance is sometimes used in order to provide some additional high frequency filtering (in conjunction with the decoupling capacitance) and to limit any current flowing into the device in the event that a surge on the battery line exceeds the absolute maximum rating of the transceiver.  It is not required for operation, though, and given that the transceiver has a wide voltage tolerance on VSUP generally diode-only protection (for battery connections with reversed polarities) is sufficient.

    If a series resistance is used, I would recommend a value of 1 kOhm or less so that the voltage drop across it remains small.

    Regards,
    Max