MPXM2102AS datasheet(562/670 Pages) MOTOROLA

562 / 670 page

AN4007

3–416

Motorola Sensor Device Data

www.motorola.com/semiconductors

TRANSFER FUNCTION

The behavior of an IPS is defined by a linear transfer

function.

This transfer function applies to all Motorola’s

Integrated Pressure Sensors whatever the pressure range

and type of sensing element (absolute or differential).

Vout + VS

) K2)

" (PE

K1)

• Vout : Sensor output voltage

• P: Applied pressure in kPa

• Vs: Sensor supply voltage in V

• K1: Sensitivity constant in V/V/kPa

• K2: Offset Constant inV/V

• PE: Pressure error in kPa

• TM: Temperature multiplier

The constants, K1, K2, PE & TM are specific to each device,

temperature and pressure encountered in the application.

The variables P and Vs are dependent on the user

application but must remain within the operating specification

of the device.

THE MPXV6115VC6U INTEGRATED

PRESSURE SENSOR

The Motorola MPXV6115VC6U gauge vacuum sensor,

designed to measure pressure below the atmospheric

pressure, is suitable for automotive application such as

vacuum pump or brake booster monitoring. The MXPV4115V

is also ideal for non–automotive applications where vacuum

control is required.

The

MPXV6115VC6U

has

the

following

basic

characteristics (Note: Detailed characteristics of Motorola’s

pressure

sensors

can

found

http://www.motorola.com/semiconductors).

MPXV6115VC6U CHARACTERISTICS

Vout + VS

0.007652

) 0.92)

" (PE

0.007652)

Figure 6. MPXV6115VC6U Transfer Function

TRANSFER FUNCTION:

Vout = 2.30 V @ P = –60 kPa

Vout = VS ([0.007652 *P] + 0.92)

–120

–100

–80

–60

–20

VACUUM in kPa (below atmospheric pressure)

–40

VACUUM

• P is the applied vacuum to the sensor pressure port.

Pressures below atmospheric pressure have a negative

sign. For example, 50 kPa below atmospheric is P = –50

in the transfer function. For pressure higher than the

atmospheric pressure, the device will electrically satu-

rate. The sensor is designed to measure vacuum from 0

kPa (Atmospheric pressure applied to the sensor pres-

sure port) down to – 115kPa.

Since the MPXV6115VC6U is using the atmospheric

pressure as reference, –115 kPa can only be reached if the

atmospheric pressure is higher or equal than 115 kPa. The

device will electrically saturate for vacuum below –115 kPa.

• PE = 1.725 kPa (1.5% of full scale span) over the entire

pressure range

• TM = 1 between 0 and +85_C, 3 at –40_C and +125_C.

TM is a linear response from –40

_ to 0_C and from 85_

to 125

_C.

The real intent for the pressure–sensor user is to know the

measured pressure. In this case it is preferable to express the

transfer function as:

+ (V

out VS * 0.92) 0.007652 " (PE

TM)

As an example, if Vout = 2.30 V for a 5 Vdc power supply and

at 25

_C ambient temperature, the measured vacuum is P =

–60.1 kPa

" 1.725 kPa.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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