SMT 160 30 SMART TEMPERATURE SENSOR Worlds first

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

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

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

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

SMT 160 – 30 Accuracy and resolution Calibrated on chip level Duty-cycle analogue signal structure Very high resolution < 0. 005ºC digital signal noise!! Only ratio no Crystal reference needed

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

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

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

SMT 160 – 30 Technical aspects

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

SMT 160 – 30 TO 220 TO 18 SOIC HE (8 x 2. 5 mm) TO 92 PRESENTLY AVAILABLE ENCAPSULATIONS

SMT 160 – 30 Inside the sensor-chip Vcc calibration i OUT i T 2 T 1 C PTAT GND D. C. =T 1/T 2 PTAT element is temperature dependent PTAT = Proportional To Absolute Temperature

SMT 160 – 30 Functional description Digital interpretation Sensor output Vcc (T 1/T 2)-0. 320 Temp = --------- [ºC] 0. 00470 T 2 Analogue Interpretation T 1 Low pass filtering D. C. =T 1/T 2 R C V T 1 Vout = Vcc * ----T 2

SMT 160 – 30 Sensor output Why Duty Cycle? Vcc - no need for Crystal reference T 2 T 1 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

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

SMT 160 – 30 Trigger level of micro T 3 T 1 due to cable capacitance T 3 T 1

SMT 160 – 30 Sensor output duty cycle linear with temperature Formula: D. C. = 0. 320 + 0. 00470*T D. C. =0 T= -68. 1 ºC D. C. =1 T= 144. 7 ºC

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

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