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TPS2113A: How to define the voltage transfer threshold

Part Number: TPS2113A


I have a question regarding the TPS2113A. How does one define the threshold voltage when the TPS2113A will automatically switch from IN1 to IN2? Is there a formula like voltage divider since I could not understand it from the datasheet?

I found a formula on Pololu site , Vtresh = (R/20K + 1)*0.8 and the following schematic:   But is that formula related to their given schematic, where the R = 20 K connected to VSNS. So it says: Vtresh = (R/20K + 1)*0.8 so if the R is 20K, does that mean if IN2 is 5V. Will it switch then IN2-1.6V  =>    5-1.6V = 3.4 basically when IN1 drops below 3.4 V it switches to IN2? Maybe I misunderstood it. I hope you can help me out. Thank you