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TPS24742: For 3 battery backup power

Part Number: TPS24742

Hi,

My customer have a 3 battery backup power system want used TPS2474x.

If they have own MCU can monitor battery voltage level, want used GPIO to control the TPS2474x, how to control the ENOR and ENHS?

Ideal behavior as below:

1.Battery 1 discharge to 2.8V low voltage, then turn on battery 2 power path discharge, turn off battery 1 power path.

2. Battery 2 discharge to 2.8V low voltage, then  turn on battery 3 power path discharge, turn off battery 2 power path.

3. Battery 3 discharge to 2.8V low voltage, then  turn on battery 1 power path discharge, turn off battery 3 power path.(manual change battery 1 to full battery)

And we can refer to which one EVM reference design?

Or is it possible can let it standalone work?