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

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

3. 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

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

5. 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!!

6. 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

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

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

9. SMT 160 – 30
Technical
aspects

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

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

12. 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

13. 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]

14. 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

15. 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

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

17. SMT 160 – 30 Sensor output duty cycle linear with temperature D.C.=0
T= ºC
D.C.=1
T= ºC
Formula: D.C.= *T

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

19. Thank you for your attention Ask for a demonstration
tel