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KP236

Analog Absolute Pressure Sensor

Functional Description

Data Sheet

Revision 1.0, 2010-06-21

2.5

Accuracy

The accuracy of the KP236 sensor is influenced by the supply voltage (ratiometric error) as well as by pressure,

temperature and aging effects. The specified value, calculated with the transfer function, represents the theoretical

value (see

Figure 3). The error equals the deviation between the measured output voltage value and the specified

output voltage value.

2.5.1

Ratiometric Error

Ideally the sensor is ratiometric - the output (V

OUT) scales by the same ratio that VDD increases or decreases. The

ratiometric error is defined as the difference between the ratio that

DD changed and the ratio that VOUT changed,

expressed as a percentage.

The output voltage

OUT is ratiometric to VDD. VDD must be in the operating range provided in Table 7.

Figure 4

Ratiometric error

2.5.2

Overall Accuracy

Overall accuracy covers the entire pressure and temperature range from different sources of error including the

following:

•

Pressure:

Output deviation from target transfer function over the specified pressure range

•

Temperature:

Output deviation over the temperature range

•

Aging:

Parameter drift over life time

Table 3

Ratiometric Error

Supply voltage (V)

Max. ratiometric error (

RAT in % of VDD, Typ)

DD,Min

± 0.5

DD,Typ

DD,Max

± 0.5

RAT (%) =

OUT(@VDD) - V OUT(@5V) x

x 100%

-0.5

VDD,MIN

VDD

0.5

VDD,MAX

VDD,TYP

ERAT (%)

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