Order this document
by MPX7200/D
SEMICONDUCTOR TECHNICAL DATA
Motorola Preferred Device
0 to 200 kPa (0 to 29 psi)
40 mV FULL SCALE SPAN
(TYPICAL)
The new MPX7200 series pressure sensor incorporates all the innovative features of
Motorola’s MPX2000 series family including the patented, single piezoresistive strain
gauge (X–ducer) and on–chip temperature compensation and calibration. In addition, the
MPX7200 series has a high input impedance of typically 10 kΩ for those portable, low
power and battery–operated applications. This device is suitable for those systems in
which users must have a dependable, accurate pressure sensor that will not consume
significant power. The MPX7200 series device is a logical and economical choice for
applications such as portable medical instrumentation, remote sensing systems with
4–20 mAmp transmission and field barometers/altimeters.
Features
•
•
•
•
•
•
Temperature Compensated Over 0°C to +85°C
Unique Silicon Shear Stress Strain Gauge
Easy to Use Chip Carrier Package Options
Available in Absolute, Differential and Gauge Configurations
Ratiometric to Supply Voltage
BASIC CHIP
CARRIER ELEMENT
CASE 344–15, STYLE 1
±0.25% Linearity (MPX7200D)
Application Examples
•
•
•
Portable Medical Instrumentation
Field Altimeters
Field Barometers
Figure 1 illustrates a schematic of the internal circuitry on the stand–alone pressure
sensor chip.
DIFFERENTIAL
PORT OPTION
V
S
CASE 344C–01, STYLE 1
3
NOTE: Pin 1 is the notched pin.
THIN FILM
TEMPERATURE
COMPENSATION
AND
CALIBRATION
CIRCUITRY
HIGH
2
4
V
Z
out+
in
PIN NUMBER
X–ducer
SENSING
ELEMENT
V
out–
1
2
Gnd
+V
3
4
V
S
–V
out
out
1
GND
Figure 1. Temperature Compensated Pressure Sensor Schematic
VOLTAGE OUTPUT versus APPLIED DIFFERENTIAL PRESSURE
The differential voltage output of the X–ducer is directly proportional to the differential
pressure applied.
The absolute sensor has a built–in reference vacuum. The output voltage will decrease
as vacuum, relative to ambient, is drawn on the pressure (P1) side.
The output voltage of the differential or gauge sensor increases with increasing
pressure applied to the pressure (P1) side relative to the vacuum (P2) side. Similarly,
output voltage increases as increasing vacuum is applied to the vacuum (P2) side
relative to the pressure (P1) side.
Preferred devices are Motorola recommended choices for future use and best overall value.
Senseon and X–ducer are trademarks of Motorola, Inc.
REV 3
Motorola Sensor Device Data
1
Motorola, Inc. 1997