SMART TEMPERATURE SENSOR digital temperature sensor SMT 160 – 30 SMART TEMPERATURE SENSOR World’s first digital temperature sensor since 1991

Smart temperature sensor Temperature measurement SMT 160 – 30 Smart temperature sensor A one chip solution for Temperature measurement Calibrated and Digitised

Features: SMT 160 – 30 Short design-in time A real cost saving solution Short design-in time Replace hardware by software Easy testing of PC-boards No EMC precautions needed

Short design in time SMT 160 – 30 Only digital transport No corrections and adjustments Simple (standard) software Very little PCB surface

Accuracy and resolution SMT 160 – 30 Accuracy and resolution Calibrated on chip level Duty-cycle analogue signal structure Only ratio no Crystal reference needed Very high resolution < 0.005ºC digital signal noise!!

Available tools for quick design-in SMT 160 – 30 Available tools for quick design-in Our WWW software examples interface boards for 8 temperature sensors Ask your distributor special support for your application

Where used? SMT 160 – 30 Some applications: professional ovens and measuring instruments (HP) thermal management in power supplies (trains) space

Where used? SMT 160 – 30 other applications: solar panel thermal management systems undersea cable amplifiers climate control and many more

SMT 160 – 30 Technical aspects

Features: SMT 160 – 30 many encapsulations high accuracy very high resolution

SMT 160 – 30 TO220 TO18 HE (8x2.5 mm) SOIC TO92 PRESENTLY AVAILABLE ENCAPSULATIONS TO18 TO92 TO220 SOIC HE (8x2.5 mm)

SMT 160 – 30 Inside the sensor-chip Vcc calibration OUT T2 T1 C GND PTAT i PTAT element is temperature dependent PTAT = Proportional To Absolute Temperature T1 T2 D.C.=T1/T2 Vcc GND OUT C calibration

SMT 160 – 30 Digital interpretation Analogue Interpretation Functional description D.C.=T1/T2 T1 Sensor output T2 Vcc Digital interpretation Analogue Interpretation R C V Low pass filtering Vout = Vcc * ----- (T1/T2)-0.320 Temp = ------------------ [ºC] 0.00470

SMT 160 – 30 Why Duty Cycle? - no need for Crystal reference Sensor output T2 T1 Vcc - no need for Crystal reference only ratio between up and total period contains information - performance check If there is a pulse, sensor is correct if not, sensor defect - easy to simulate for test-purposes

Sensor output SMT 160 – 30 standard totem pole output excellent protection against EMC max 10 metres of cable (shielded!) 1 km with digital interface driver

SMT 160 – 30 T3  T1 due to cable capacitance T3 T1 Trigger level of micro T1 T3 T3  T1 due to cable capacitance

SMT 160 – 30 Sensor output duty cycle linear with temperature D.C.=0 T= -68.1 ºC D.C.=1 T= 144.7 ºC Formula: D.C.= 0.320 + 0.00470*T

Temperature Sensor Microcontroller Accuracy Resolution SMT 160 – 30 A demonstration to show Accuracy Resolution

Thank you for your attention Ask for a demonstration tel +31 76 520 53 53 SmartecNL@compuserve.com