MPXM2102AS datasheet(537/670 Pages) MOTOROLA

537 / 670 page

AN1668

3–391

Motorola Sensor Device Data

www.motorola.com/semiconductors

Table 1. MPX2010 Specifications

Characteristic

Min

Typ

Max

Unit

Pressure Range

kPa

Supply Voltage

Vdc

Supply Current

Full Scale Span

Offset

Sensitivity

mV/kPa

Linearity

%VFSS

Pressure Hysterisis

0.1

%VFSS

Temperature Hysterisis (

*40 to 125°C)

0.5

%VFSS

Temperature Effect on Span

%VFSS

Temperature Effect Offset (0 to 85

°C)

Input Impedance

1300

2550

ohms

Output Impedance

1400

3000

ohms

Response Time (10% to 90%)

Warm–Up

The sensor system errors is made up of the sensor errors,

amplifier errors and A/D errors. In other words,

(1)

eSystem + eSensor2 ) eAmplifier2 ) eADResolution2

Table 2 shows the MPX2010 with the errors converted to

%VFSS. The expected maximum root mean squared error of

the sensor is

(2)

eSensor + SpanCal2 ) Lin2 ) Phys2 ) Thys2 ) Tcs2 ) OffCal2 ) Tco2 ) OffStab2

= +/– 7.19 % FS.

With auto–zeroing, the offset calibration, temperature effect

on offset and offset stability is reduced or eliminated,

eSensor + SpanCal2 ) Lin2 ) Phys2 ) Thys2 ) Tcs2

(3)

= +/– 4.42 % FS.

The sensor error is calculated using the full–scale pres-

sure range of the device, 0 to 85

°C temperature and 10 V

excitation.

In comparison with the MPXV4006G solution, the expected

accuracy of the system (MPXV4006G + 8 bit A/D) with

auto–zero is 3.1 % FS.

Table 2. MPX2010 span, offset and calculated maximum RMS error. *This assumes that the power supply is constant.

Span Errors (converted to %VFSS)

Symbol

Error Value

Note

Unit

Span Calibration

SpanCal

%VFSS

Linearity

Lin

%VFSS

Pressure Hysterisis

Phys

0.1

%VFSS

Temperature Hysterisis

Thys

0.5

%VFSS

Temperature Effect on Span

Tcs

1.5

%VFSS

Offset Errors (converted to %VFSS)

Offset Calibration

OffCal

%VFSS

Temperature Effect on Offset

Tco

%VFSS

Offset Stability

OffStab

0.5

%VFSS

Calculated Maximum RMS Errors

RMS Error

No Compensation*

7.19

%FS

With auto–zero

4.42

%FS

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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