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TIDA-01604: Reason of using a SPDT in current sense circuit

Naveed Ishraq
Prodigy 140 points
Part Number: TIDA-01604

Hello,

In the current sensor design schematic I can see one SN74LVC1G3157DRYR which is a SPDT switch. What is the purpose of this in current sensing and also what signal is G_AC_I that goes to the S pin?

Moreover, the sensed signal from the allegro current sensor already has a DC bias of 1.65V (VCC*0.5). Then, what is the reason for using AC_CUR_VREF in the op-amp circuit? 

Thanks!

Naveed