What are the voltages in the LPF and HPF exactly indicating?

What are the voltages in the LPF and HPF exactly indicating?

Hello and good day,


For Gen3.1 sensors I know that the high-pass and low-pass filters' values are indicated in mV. 
This voltage is exactly from which part of the sensor and changing them makes what changes in the circuit?
Is there a schematic diagram of the internal circuit of the sensor fir better understanding of the connections and mechanism?


Thank you in advance for the help!