MPXV7002_08 Datasheet, PDF (3/10 Pages) Freescale Semiconductor, Inc – Integrated Silicon Pressure Sensor On-Chip Signal Conditioned, Temperature Compensated and Calibrated

ON-CHIP TEMPERATURE COMPENSATION, CALIBRATION AND SIGNAL CONDITIONING
The performance over temperature is achieved by
integrating the shear-stress strain gauge, temperature
compensation, calibration and signal conditioning circuitry
onto a single monolithic chip.
Figure 2 illustrates the Differential or Gauge configuration
in the basic chip carrier (Case 482). A gel die coat isolates the
die surface and wire bonds from the environment, while
allowing the pressure signal to be transmitted to the sensor
diaphragm.
The MPXV7002 series pressure sensor operating
characteristics, and internal reliability and qualification tests
are based on use of dry air as the pressure media. Media,
other than dry air, may have adverse effects on sensor
performance and long-term reliability. Contact the factory for
information regarding media compatibility in your application.
Figure 3 shows the recommended decoupling circuit for
interfacing the integrated sensor to the A/D input of a
microprocessor or microcontroller. Proper decoupling of the
power supply is recommended.
Figure 4 shows the sensor output signal relative to
pressure input. Typical, minimum, and maximum output
curves are shown for operation over a temperature range of
10° to 60°C using the decoupling circuit shown in Figure 3.
The output will saturate outside of the specified pressure
range.
Fluoro Silicone
Gel Die Coat
Wire Bond
Lead
Frame
Die
P1
Stainless
Steel Cap
Thermoplastic
Case
1.0 μF
+5 V
V_out
V_s
IPS
0.01 μF
GND
OUTPUT
470 pF
P2
Differential Sensing
Element
Figure 2. Cross-Sectional Diagram SOP
(not to scale)
Die Bond
Figure 3. Recommended Power Supply Decoupling
and Output Filtering
(For additional output filtering, please refer to
Application Note AN1646.)
5.0
Transfer Function:
V_out = V_S × (0.2 × P(kPa)+0.5) ± 6.25% V_FSS
4.0 ^VS ^{= 5.0 Vdc}
T_A = 10 to 60°C
3.0
MAX
2.0
MIN
1.0
TYPICAL
0
-2
-1
0
1
2
Differential Pressure (kPa)
Figure 4. Output versus Pressure Differential
Sensors
Freescale Semiconductor
MPXV7002
3