PROBLEM TO BE SOLVED: To provide an interface unit comprising a sensor interface circuitry having low noise characteristics.SOLUTION: An interface unit 8 comprises a sensor interface circuitry 6 adapted to interface a sensor wire configured to be inserted into the living body and provided with one or many sensor elements at its distal region. The sensor interface circuitry 6 comprises a measurement unit 9 adapted to generate measured data of the variable as a sensor signal. The interface unit 8 further comprises a control unit 1 adapted to control and supervise a plurality of different functions of the interface unit 8, where the different functions are performed by predefined tasks (T1, T2, ... TN) during consecutive control periods CP having the same time duration.LA PRESENTE INVENCIÓN TRATA ACERCA DE UNA UNIDAD DE INTERFAZ EXTRACORPÓREA (8), PARA UN SISTEMA DE MEDICIÓN INTRAVASCULAR, PARA MEDIR UNA VARIABLE FISIOLÓGICA O DE OTRO TIPO EN UN ORGANISMO, LA CUAL ESTÁ ADAPTADA PARA GENERAR UNA SEÑAL DEL SENSOR COMO RESPUESTA A UNA VARIABLE.-
