Vref Discrepancy in ULPSM board

Automation and Control Sensors Transducers
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1

Greetings!

Upon checking the ULPSM schematic I have seen that there are discrepancy in the Vref compared to the Vref description in the datasheet.

In the schematic it shows that the Vref pin is for input purposes while on the datasheet it is declared as an output.

O3 Sensor with Platform.pdf (700.5 KB)
ULPSM_R10_SCH.pdf (923.6 KB)

2

My reading of the schematic tells me that Vref comes from the output of a resistive voltage divider driven by the 3.3V power. Vref drives both an Op-Amp input and the Vref output pin.