ASB1200E datasheet(6/8 Pages) EPCOS

6 / 8 page

Pressure sensors

Barometric pressure transducer for SMT

ASB 1200 E

Preliminary data

AS SEN PD

2009-08-03

Please read

Cautions and warnings and

Page 6 of 8

Important notes at the end of this document.

αs and βs are the linear and nonlinear temperature coefficient of the sensitivity respectively (see

15)).

Therefore TCV0

+ and TCV0– are defined for the measurement temperature range by:

)

(

)

(

TCVo

max

−

)

(

)

(

TCVo

min

−

12) Full scale value FS

max

out

)

(

−

13) Sensitivity S

The sensitivity is defined for a bridge voltage power supply VDD = 5 V. It can be determined by the formula:

max

out

)

(

−

This parameter is tested for process control on samples.

14) Nonlinearity L

This parameter may be influenced by assembly.

The nonlinearity is measured using the endpoint method. Assuming a characteristic, this can be approximated

by a polynomial of second order, where the maximum is at px = prmax/2. The nonlinearity is defined at px = prmax/2,

using the equation:

max

out

)

(

)

(

−

This parameter is tested for process control on samples, mounted on a TO39 base.

15) Temperature coefficient of sensitivity α

αS and β

βS:

These parameters may be influenced by assembly.

The temperature coefficients of sensitivity are tested for design verification on samples

over a reduced temperature range Tmeas,min = –20 °C to Tmeas,max = 80 °C with TR = 25 °C.

The temperature coefficients of first and second order are defined with the polynomial:

(

) (

) 











−

)

(

)

(

The coefficients αS and βS are calculated using the three measurement points of S(T) at Tmeas,min, TR and Tmeas,max.

16) Pressure hysteresis pHys

The pressure hysteresis is the difference between output voltages at constant pressure and constant temperature while

applying a pressure cycle with pressure steps of pr, min, p1, p2, p3, pr,max, p3, p2, p1, pr, min:

)

(

)

(

pHys

out

−

With k = min, 1, 2, 3, max. The pressure steps are: prmin = 0, p1 = 0.25·pr,max, p2 = 0.5·pr,max, p3 = 0.75·pr, max, pr,max.

This parameter is tested for design verification on samples.

17) Reliability data

For long-term stability of offset voltage LTSV0 please refer to the defined Aktiv Sensor’s standard AS100001 in chapter

“Reliability data” on the internet.

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