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In the datasheed for the ACS71020 IC, it shows the typical application of the device in which current is passed through the chip and voltage is measured on the opposite side.

I do not understand how the voltage measurement pins can be placed on the same side of the IC as the low voltage connections. Doesn't this ruin the mains isolation from the low voltage side?

https://media.digikey.com/pdf/Data%20Sheets/Allegro%20PDFs/ACS71020.pdf

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The multiple 1 MΩ resistors are part of the isolation barrier between the mains and the low-voltage side of the chip. Clearance and creepage are not an issue at the pins, because the chip itself prevents the voltages on those pins from getting too far from ground potential.

The suggested layout doesn't show the resistors, but I assume that they would have to be through-hole devices so that the circuit meets clearance and creepage requirements between the two sides.

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