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Can anyone explain me questions about BQ24090?

Hi, I want to ask some questions about BQ24090.

According to the schematic in the datasheet of BQ24090, I have several questions below:

When should the led indicator of the charging chip be used? Is it used to indicate whether the power adapter has been plugged in?

What’s more, pin 9 should connect to a thermistor. Do I need to buy another single thermistor or not? What’s the influence if not?

Sorry for my poor English, but I’m really confused. Hope you can help me!

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