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參數(shù)資料
| 型號： | MPX2000 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Pressure Sensor(壓力傳感器) |
| 中文描述： | 壓力傳感器（壓力傳感器） |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 109K |
| 代理商： | MPX2000 |
1
Motorola, Inc. 1997
Prepared by: Michel Burri, Senior System Engineer
Geneva, Switzerland
INTRODUCTION
The
semiconductor devices which give an electrical output signal
proportional to the applied pressure. The sensors are a single
monolithic silicon diaphragm with strain gauge and thin–film
resistor networks on the chip. Each chip is laser trimmed for
full scale output, offset, and temperature compensation.
The purpose of this document is to describe another method
of measurement which should facilitate the life of the designer.
The MPX2000 series sensors are available both as unported
elements and as ported assemblies suitable for pressure,
vacuum and differential pressure measurements in the range
of 10 kPa through 200 kPa.
The use of the on–chip A/D converter of Motorola’s
MC68HC05B6 HCMOS MCU makes possible the design of
an accurate and reliable pressure measurement system.
MPX2000
series
pressure
transducers
are
SYSTEM ANALYSIS
The measurement system is made up of the pressure
sensor, the amplifiers, and the MCU. Each element in the
chain has its own device–to–device variations and
temperature effects which should be analyzed separately. For
instance, the 8–bit A/D converter has a quantization error of
about
±
0.2%. This error should be subtracted from the
maximum error specified for the system to find the available
error for the rest of elements in the chain. The MPX2000 series
pressure sensors are designed to provide an output sensitivity
of 4.0 mV/V excitation voltage with full–scale pressure applied
or 20 mV at the excitation voltage of 5.0 Vdc.
An interesting property must be considered to define the
configuration of the system: the ratiometric function of both the
A/D converter and the pressure sensor device. The
ratiometric function of these elements makes all voltage
variations from the power supply rejected by the system. With
this advantage, it is possible to design a chain of amplification
where the signal is conditioned in a different way.
+ V
s
PIN 3
R
p
PIN 2
+
–
PIN 4
V
out
R
in
Rs2
PIN 1
GND
THERMISTOR
LASER
TRIMMED
ON–CHIP
Figure 1. Seven Laser–Trimmed Resistors and Two
Thermistors Calibrate the Sensor for Offset, Span,
Symmetry and Temperature Compensation
The op amp configuration should have a good
common–mode rejection ratio to cancel the DC component
voltage of the pressure sensor element which is about half the
excitation voltage value V
S
. Also, the op amp configuration is
important when the designer’s objective is to minimize the
calibration procedures which cost time and money and often
don’t allow the unit–to–unit replacement of devices or modules.
One other aspect is that most of the applications are not
affected by inaccuracy in the region 0 kPa thru 40 kPa.
Therefore, the goal is to obtain an acceptable tolerance of the
system from 40 kPa through 100 kPa, thus minimizing the
inherent offset voltage of the pressure sensor.
Order this document
by AN1097/D
SEMICONDUCTOR APPLICATION NOTE
REV 1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MPX2010 | Pressure Sensor(壓力傳感器) |
| MPX2053 | 50 KPA ON CHIP TEMPERATURE COMPENSATED CALIBRATED SILICON PRESSURE SENSORS |
| MPXV2053DP | 50 KPA ON CHIP TEMPERATURE COMPENSATED CALIBRATED SILICON PRESSURE SENSORS |
| MPXV2053G | 50 KPA ON CHIP TEMPERATURE COMPENSATED CALIBRATED SILICON PRESSURE SENSORS |
| MPXV2053GP | 50 KPA ON CHIP TEMPERATURE COMPENSATED CALIBRATED SILICON PRESSURE SENSORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MPX200A | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:0 to 200 kPa (0-29 psi) 60 mV FULL SCALE SPAN (TYPICAL) |
| MPX200AP | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:0 to 200 kPa (0-29 psi) 60 mV FULL SCALE SPAN (TYPICAL) |
| MPX200AS | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:0 to 200 kPa (0-29 psi) 60 mV FULL SCALE SPAN (TYPICAL) |
| MPX200ASX | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:0 to 200 kPa (0-29 psi) 60 mV FULL SCALE SPAN (TYPICAL) |
| MPX200D | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:X-ducer SILICON PRESSURE SENSOR |
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