The 1-Wire port is based around a DS2482-800 &DS2482-100 I2C to 1-Wire bridge device. The DS2482-800 provides bi-directional protocol conversion between the I2C port on the Raspberry Pi and any attached 1-Wire® slave devices. An ESD Protection Diode is used to protect the Board and Raspberry Pi from electrostatic spikes on the 1-Wire port. Connections to the 1-Wire port can be made through pin on the PCB.

1-Wire 2482-100  1 channel WITH 1 ESD protection diode     DS2482-100 Datasheet

1 Wire  2482-800 8 channel  with 8 ESD protection diode      DS2482-800 Datasheet

with DS18B20 Temperature Sensor   

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  User Manual      1-Wire Setting  information

 1-Wire setting for Pi3/Pi4