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TPS2H000-Q1: Series Resistor used in HSD to interface with MCU.

Sandeep P
Prodigy 10 points
Part Number: TPS2H000-Q1

Hi,

We have been using this HSD "TPS2H000-Q1" in one of our Overhead console product. 

My question is with reference to Page # 26 section 9.2 Typical Application circuit shows the interface of HSD with MCU.

Could you please help in understanding the exact purpose of R(ser) resistors used in this application circuit? and if you have any proof of same available then is it possible to share with us?

Thanks in Advance.

Sandeep P

  • 0
    TI__Expert 3500 points

    Sandeep-

    The RSER resistors are in place to protect the MCU from excess current flow during reverse battery case. When negative voltage is applied to VBB, the ESD cells make is to that the I/O pins have a negative voltage output on them. If there is no RSER resistor and these I/O pins are attached to an MCU, this means that there is a low impedance path between the battery and the module GND and there will be dangerous excess current flow. RSER resistors limit this current to a safe level so that the system can withstand the reverse battery condition.

    Does that answer your question? Let me know if there are any follow ups.

    Thanks,

    Alec