1.2.3.1.4 Temperature sensor
In Circulo a specific temperature sensor port with selectable integrated pull-up resistors is available. This input
port is suitable for RTD sensors because of its high input resistance (1 MΩ). Alternatively, the single-ended 5 V
Analog input with an external pull-up resistor can be used as an RTD sensor input as well.
A reference voltage of 5 V is supplied. The sensor’s recommended current is typically about 1 mA (please refer
to the manufacturer data sheet). The pull-up resistor has to be selected according to the RTDs data sheet to
ensure that the current is not higher or lower than required.
Note
Please ensure that the voltage attached to the temperature sensor input is between 0 V and 5 V.
Note
Synapticon has successfully tested PT1000 and KTY84-130. PT100 will also work but be aware that its low
resistance will result in a low accuracy so this type can’t be recommended.
In case you want to use other sensors, such as NTC, please contact support@synapticon.com.
Circulo 7
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