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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. A real cost saving solution. SMT 160 – 30. Features:.

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Presentation Transcript
slide1

SMT 160 – 30

SMART TEMPERATURE SENSOR

World’s first

digital temperature sensor

since 1991

slide2

SMT 160 – 30

Smart temperature sensor

A one chip solution for

Temperature measurement

Calibrated and Digitised

slide3

A real cost saving solution

SMT 160 – 30

Features:

Short design-in time

Replace hardware by software

Easy testing of PC-boards

No EMC precautions needed

slide4

Only digital transport

No corrections and adjustments

Simple (standard) software

Very little PCB surface

SMT 160 – 30

Short design in time

slide5

Duty-cycle

analogue signal structure

Very high resolution

< 0.005ºC digital signal noise!!

Only ratio

no Crystal reference needed

SMT 160 – 30

Accuracy and resolution

Calibrated on chip level

slide6

software examples

Our WWW

interface boards for

8 temperature sensors

Ask your

distributor

special support for

your application

SMT 160 – 30

Available tools for quick design-in

slide7

SMT 160 – 30

Where used?

Some applications:

professional ovens and

measuring instruments (HP)

thermal management in

power supplies (trains)

space

slide8

SMT 160 – 30

Where used?

other applications:

solar panel thermal management systems

undersea cable amplifiers

climate control

and many more

slide9

Technical

aspects

SMT 160 – 30

slide10

many encapsulations

high accuracy

very high resolution

SMT 160 – 30

Features:

slide11

TO220

TO18

HE (8x2.5 mm)

SOIC

TO92

PRESENTLY AVAILABLE ENCAPSULATIONS

SMT 160 – 30

slide12

Inside the sensor-chip

Vcc

calibration

i

OUT

T2

T1

i

C

PTAT

GND

D.C.=T1/T2

PTAT element is temperature dependent

PTAT = Proportional To Absolute Temperature

SMT 160 – 30

slide13

Functional description

Digital interpretation

Sensor output

Vcc

(T1/T2)-0.320

Temp = ------------------ [ºC]

0.00470

T2

Analogue Interpretation

T1

Low pass filtering

D.C.=T1/T2

T1

Vout = Vcc * -----

T2

R

C

V

SMT 160 – 30

slide14

Sensor output

Vcc

T2

T1

SMT 160 – 30

Why Duty Cycle?

- 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

slide15

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

slide16

Trigger level of micro

T3  T1

due to cable capacitance

T3

T1

SMT 160 – 30

slide17

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

slide18

SMT 160 – 30

Sensor

Temperature

Microcontroller

A demonstration to show

Accuracy

Resolution

slide19

Thank you for

your attention

Ask for a demonstration

tel +31 76 520 53 53

SmartecNL@compuserve.com