ML-OI-AX-DS18B20 – Option board

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ML-OI-AX-DS18B20, Input board to connect 1-Wire digital thermometers

Using thermistors for temperature monitoring can be very cumbersome as you have to calibrate each sensor and take the cable resistance into account as well.

A less cumbersome and popular alternative for temperature monitoring is to use (low cost) temperature sensors based on Maxim Integrated factory calibrated 1-Wire digital thermometer chips.

The ML-OI-AX-DS18B20 option input board can be used to connect up to four 1-Wire thermometers 1,2).

Although 1-Wire supports the connection of multiple sensors on the same 1-Wire cable/bus, we have chosen for “easy deployment” reasons to work with 4 separated 1-Wire inputs. When restricting to one sensor per 1-Wire input/bus, the board does not need to know the unique ID of the 1-Wire chip, so you can easily plug-in or exchange/replace sensors.



  • Protocol: 1-Wire (Maxim Integrated)
  • Number of channels: 4
  • Excitation1): 3.6V DC
  • Supported chips2): DS18B20, as well as DS1820, DS18S20, DS1822 & DS1920

1) 1-Wire thermometers can be parasitically powered, the board however expects sensors that needs to be powered explicitly.
2) Only use sensors based on genuine Maxim Integrated thermometers.

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