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TPS8802EVM: TPS8802

Part Number: TPS8802EVM
Other Parts Discussed in Thread: TPS8802

Tool/software:

In the TPS8802, TI is using 1 photodiode and 2 LEDs but there are different configuration with 2 photodiodes and 2 LEDs. Why is TI using 1 photodiodes only? and how does both the configuration works? 

Please reply ASAP.