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TPS92611-Q1: TPS92611-Q1 different behavior between LED short_to_GND and thermal shutdown

Part Number: TPS92611-Q1
Other Parts Discussed in Thread: TPS92629-Q1

Hi Expert,

Our customer would like to use TPS92611-Q1 in a radar application. Since TPS92611-q1 can only output FAULT signal to indicate there is a fault but cannot tell which fault is happening, our customer would like to use an ADC to sample OUT pin voltage to distinguish different faulty situation. 

Now there is some question you may help. When LED short to GND happens, OUT pin voltage is 0V. When thermal shutdown happens, the device shuts down and doesn't work. So from my understanding, OUT pin voltage is also 0V. So ADC cannot tell which one happens. They come up a solution. They use a pull up resistor between OUT pin and Vin. When short to GND, OUT pin is still 0V. When thermal shutdown, we need you to tell what's the behavior of OUT pin. Is it connected internally to GND or just floating? If floating, the OUT pin will be pulled up to Vin. Then here comes the difference!

For above solution, please feel free to give comments and your better suggestion if you have. Thanks a lot for your help!

BR,

Elec Cheng