MPXM2102AS datasheet(411/670 Pages) MOTOROLA

411 / 670 page

AN1316

3–265

Motorola Sensor Device Data

www.motorola.com/semiconductors

Table 1. Specifications

Characteristics

Symbol

Min

Typ

Max

Units

Power Supply Voltage

B+

Volts

Full Scale Pressure

PFS

– MPX2010

kPa

– MPX2050

kPa

– MPX2100

100

kPa

– MPX2200

200

kPa

Full Scale Output

fFS

kHz

Zero Pressure Offset

fOFF

kHz

Sensitivity

SAOUT

9/PFS

kHz/kPa

Quiescent Current

ICC

EVALUATION BOARD

The following sections present an example of the signal

conditioning, including frequency conversion, that was

developed as an evaluation tool for the Motorola MPX2000

series pressure sensors. A summary of the information

required to use evaluation board number DEVB160 is

presented as follows.

Description

The evaluation board shown in Figure 1 is designed to

transduce pressure, vacuum or differential pressure into a

single–ended, ground referenced voltage that is then input to

a voltage–to–frequency converter. It nominally provides a 1

kHz output at zero pressure and 10 kHz at full scale pressure.

Zero pressure calibration is made with a trimpot that is located

on the lower half of the left side of the board, while the full scale

output can be calibrated via another trimpot just above the

offset adjust. The board comes with an MPX2100DP sensor

installed, but will accommodate any MPX2000 series sensor.

One additional modification that may be required is that the

gain of the circuit must be increased slightly when using an

MPX2010 sensor. Specifically, the resistor R5 must be

increased from 7.5 k

Ω to 12 kΩ.

Circuit Description

The following pin description and circuit operation

corresponds to the schematic shown in Figure 2.

Pin–by–Pin Description

B+:

Input power is supplied at the B+ terminal of connector CN1.

Minimum input voltage is 10 V and maximum is 30 V.

Fout:

A logic–level (5 V) frequency output is supplied at the OUT

terminal (CN1). The nominal signal it provides is 1 kHz at zero

pressure and 10 kHz at full scale pressure. Zero pressure

frequency is adjustable and set with R12. Full–scale

frequency is calibrated via R13. This output is designed to be

directly connected to a microcontroller timer system

input–capture channel.

GND:

The ground terminal on connector CN1 is intended for use

as the power supply return and signal common. Test point

terminal TP3 is also connected to ground, for measurement

convenience.

TP1:

Test point 1 is connected to the final frequency output, Fout.

TP2:

Test point 2 is connected to the +5 V regulator output. It can

be used to verify that this supply voltage is within its tolerance.

TP3:

Test point 3 is the additional ground point mentioned above

in the GND description.

TP4:

Test point 4 is connected to the +8 V regulator output. It can

be used to verify that this supply voltage is within its tolerance.

P1, P2:

Pressure and Vacuum ports P1 and P2 protrude from the

sensor on the right side of the board. Pressure port P1 is on

the top (marked side of package) and vacuum port P2, if

present, is on the bottom. When the board is set up with a dual

ported sensor (DP suffix), pressure applied to P1, vacuum

applied to P2 or a differential pressure applied between the

two all produce the same output voltage per kPa of input.

Neither port is labeled.

Absolute maximum differential

pressure is 700 kPa.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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