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LP87524-Q1: nINT related quesitons

Amelie Zheng
Genius 10865 points
Part Number: LP87524-Q1
Other Parts Discussed in Thread: IWR6843AOPEVM

Hi Team,

May I ask the following quesitons?

1. The nINT polarity type is D/O, which can be used to interrupt the MCU in some cases. Why is the 3.3V power supply directly connected to this plug through a current limiting resistor in the design of IWR6843AoPEVM?
Does the EVM motherboard MCU do not need this signal, and must nINT be pulled up?

2. In the design of IWR6843AoPEVM, nINT is not connected to the MCU. Assuming that there is an output short circuit, the nINT interrupt pin will be reset after being pulled low. Can IIC clear the flag and release nINT?

3. The PGOOD spindle type is also D/O. The usage method is similar to nINT. The question is the same as 1. Why is it all 3.3V directly connected through a resistor?

  • 0
    TI__Genius 11020 points

    Hello Amelie,

    1. NINT is open-drain output and needs pull-up resistor to operate.

    2. Yes faults can be cleared through I2C

    3. PGOOD is also configured as open-drain output and needs pull-up resistor to operate correctly.

    Thanks.

    Regards,

    Tomi Koskela