MPXS4100A SERIES

3

Motorola Sensor Device Data

µ PROCESSOR

A/D

51 k

50 pF

MPXS4100A

SENSOR

OUTPUT

(PIN 4)

Figure 2. Recommended Decoupling Filter for

Sensor to Microprocessor Interface

The MPXS4100A series piezoresistive transducer is a

state–of–the–art, monolithic, signal conditioned, silicon

pressure sensor. This sensor, with its patented X–ducer,

combines advanced micromachining techniques, thin film

metallization and bipolar semiconductor processing to

provide an accurate, high level analog output signal that is

proportional to applied pressure. A vacuum is sealed behind

the sensor diaphragm providing a reliable pressure

reference.

This surface mount package (Case 471) is an absolute

sensing configuration package. A fluorosilicone gel isolates

the die surface and wire bonds from the environment, while

allowing the pressure signal to be transmitted to the silicon

diaphragm. The MPXS4100A series pressure sensor oper-

ating characteristics, 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 perfor-

mance and long–term reliability. Contact the factory for in-

formation regarding media compatibility in your application.

Figure 2 shows the recommended decoupling circuit for in-

terfacing the output of the integrated BAP sensor to the A/D

input of a microprocessor (see Note 9).

Figure 3 shows the sensor output signal relative to pres-

sure input. Typical minimum and maximum output curves are

shown for operation over 0 to 85

°C temperature range. (Out-

put will saturate outside of the rated 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 3. Output versus Absolute Pressure

TEMP = 0 to 85

°C

20 kPA TO 105 kPA

MPXS4100A

TRANSFER FUNCTION:

Vout = Vs* (.01059*P–.152) ± Error

VS = 5.1 Vdc