MPXT4100 MPXT4101 MPXT4105 SERIES

4

Motorola Sensor Device Data

Figure 2. Cross Sectional Diagram

(Not to Scale)

µ PROCESSOR

A/D

51 k

50 pF

SENSOR

OUTPUT

(PIN 1)

Figure 3. Decoupling Filter for Sensor to

Microprocessor Interface

FLUORO SILICONE

DIE COAT

WIRE BONDS

LEAD FRAME

DIE

STAINLESS STEEL

METAL COVER

EPOXY CASE

P1

Figure 2 illustrates an absolute sensing chip in the basic

chip carrier (Case 473). A fluorosilicone gel isolates the die

surface and wire bonds from the environment, while allowing

the pressure signal to be transmitted to the sensor dia-

phragm. The MPXT4100A/4101A/4105A 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 a typical decoupling circuit for interfacing

the integrated MAP sensor to the A/D input of a microproces-

sor. Proper decoupilng of the power supply is recommended.

Figures 4, 5, and 6 show 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. (The output will saturate outside of the specified

pressure range.)

5.0

4.5

4.0

3.5

3.0

Pressure (ref: to sealed vacuum) in kPa

TYP

MAX

MIN

2.5

2.0

1.5

1.0

0.5

0

Figure 4. Output versus Absolute Pressure

TEMP = 0 to 85

°C

20 kPA TO 105 kPA

MPXT4100A

TRANSFER FUNCTION:

Vout = Vs* (.01059*P–.152) ± Error

VS = 5.1 Vdc

6.0

5.0

4.0

3.0

2.0

Pressure (ref: to sealed vacuum) in kPa

TYP

MAX

MIN

1.0

0.0

Figure 5. Output versus Absolute Pressure

TEMP = 0 to 85

°C

15 kPA TO 102 kPA

MPXT4101A

TRANSFER FUNCTION:

Vout = Vs* (.01059*P–.109) ± Error

VS = 5.1 Vdc

5.0

4.5

4.0

3.5

3.0

Pressure (ref: to sealed vacuum) in kPa

MAX

MIN

2.5

2.0

1.5

1.0

0.5

0

Figure 6. Output versus Absolute Pressure

TEMP = 0 to 85

°C

15 kPA TO 105 kPA

MPXT4105A

TRANSFER FUNCTION:

Vout = Vs* (0.01*P–0.09) ± Error

VS = 5.1 Vdc

TYP