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AWR1642: ES2.0 borad changes versus ES1.0 borad

Part Number: AWR1642

I find that in SDK2.0, the lowPower is only allowed to set as 0 1, and in SDK1.2, the lowPower is set to 0 0

This means a difference of LDO voltage input. 

Is there any difference in hardware design for ES1.0 and ES2.0?

I find 6dB noise up in this case.