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OPT3001: Drop in replacement for another ALS but ADDR unconnected

Part Number: OPT3001

Hi,

the datasheet sais to connect the ADDR pin to change the I2C address. I wonder wether there is an internal pullup/pulldown or something similar because i want to use this part as a drop in replacement for another sensor with the same footprint from another company. That one doesn't use the ADDR pin therefore it is unconnected. 
The PCBs are already manufactured thats why i cant change the design.

basic question: How does this IC behaves it ADDR is unconnected?



Thank you for your response

Daniel Lux