
3–391
Motorola Sensor Device Data
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Table 1. MPX2010 Specifications
Characteristic
Min
0
Typ
Max
10
Unit
kPa
Pressure Range
Supply Voltage
10
16
Vdc
Supply Current
6
mA
Full Scale Span
24
25
26
mV
Offset
1
1
mV
Sensitivity
25
mV/kPa
Linearity
1
1
%VFSS
%VFSS
%VFSS
%VFSS
mV
Pressure Hysterisis
0.1
Temperature Hysterisis (
40 to 125
°
C)
0.5
Temperature Effect on Span
1
1
Temperature Effect Offset (0 to 85
°
C)
Input Impedance
1
1
1300
2550
ohms
Output Impedance
1400
3000
ohms
Response Time (10% to 90%)
1
ms
Warm–Up
20
ms
The sensor system errors is made up of the sensor errors,
amplifier errors and A/D errors. In other words,
(1)
System
Sensor
2
Amplifier
2
ADResolution
2
Table 2 shows the MPX2010 with the errors converted to
%VFSS. The expected maximum root mean squared error of
the sensor is
(2)
Sensor
SpanCal
2
Lin
2
Phys
2
Thys
2
Tcs
2
OffCal
2
Tco
2
OffStab
2
= +/– 7.19 % FS.
With auto–zeroing, the offset calibration, temperature effect
on offset and offset stability is reduced or eliminated,
Sensor
SpanCal
2
Lin
2
Phys
2
Thys
2
Tcs
2
(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)
Span Calibration
Symbol
SpanCal
Error Value
4
Note
Unit
%VFSS
%VFSS
%VFSS
%VFSS
%VFSS
Linearity
Lin
1
Pressure Hysterisis
Phys
0.1
Temperature Hysterisis
Thys
0.5
Temperature Effect on Span
Tcs
1.5
Offset Errors (converted to %VFSS)
Offset Calibration
OffCal
4
%VFSS
%VFSS
%VFSS
Temperature Effect on Offset
Tco
4
Offset Stability
OffStab
0.5
Calculated Maximum RMS Errors
No Compensation*
RMS Error
7.19
%FS
%FS
With auto–zero
4.42
F
Freescale Semiconductor, Inc.
n
.