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SM72445: SM72445 Datasheet NC4 Resistor Selection

Part Number: SM72445

Good day

I note the datasheet calls for a pull up resistor value of 60.4K to the 5V line. The Solar Magic design uses a 174K pull up resistor.

There is no explanation in the datasheet regarding the function of NC4 (pin 23) so it makes for difficult understanding as to why a specific value of 60.4K is the recommended vlaue.

Anyone have any idea of why this is so?

Kind regards

Nick