MPXA4115A View Datasheet(PDF) - Freescale Semiconductor
Part Name
Description
Manufacturer
MPXA4115A Datasheet PDF : 14 Pages
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Pressure
On-chip Temperature Compensation and Calibration
Figure 2 illustrates an absolute sensing chip in the basic
chip carrier (Case 867) and the small outline chip carrier
(Case 482). A fluorosilicone gel isolates the die surface and
wire bonds from the environment, while allowing the pressure
signal to be transmitted to the sensor diaphragm. The
MPX4115A 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 output of 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
0° to 85°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
Die
P1
Stainless Steel
Metal Cover
Epoxy Plastic
Case
Fluoro Silicone
Gel Die Coat
P1
Wire Bond
Lead Frame
Die
Stainless Steel
Steel Cap
Thermoplastic
Case
Lead Frame
Sealed Vacuum Reference
Absolute Element
P2
Die
Bond
Absolute Element
Die
Sealed Vacuum Reference
Bond
Figure 2. Cross-Sectional Diagram (not to scale)
+5.1 V
1.0 μF
Vout
Vs
IPS
0.01 μF
GND
Output
470 pF
Figure 3. Recommended Power Supply Decoupling and Output Filtering
(For output filtering recommendations, refer to Application Note AN1646.)
5.0
4.5 TRANSFER FUNCTION:
Vout = Vs* (.009*P-.095) ± Error
MAX
4.0 VS = 5.1 Vdc
3.5 TEMP = 0 to 85°C
3.0
2.5
TYP
2.0
1.5
1.0
0.5
MIN
0
Pressure (ref. to sealed vacuum) in kPa
Figure 4. Output versus Absolute Pressure
Sensors
Freescale Semiconductor
MPX4115A
5
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