MPXM2102AS datasheet(361/670 Pages) MOTOROLA

361 / 670 page

AN1304

3–215

Motorola Sensor Device Data

www.motorola.com/semiconductors

EVALUATION BOARD DESCRIPTION

A summary of the information required to use evaluation

board number DEVB129 is presented as follows. A discussion

the

design

appears

under

the

heading

Design

Considerations.

FUNCTION

The evaluation board shown in Figure 1 is designed to

provide a 100 kPa full scale pressure measurement. It has two

input ports. P1, the pressure port is on the top side of the

MPX5100 sensor, and P2, a vacuum port, is on the bottom

side. These ports can be supplied up to 100 kPa (15 psi)* of

pressure on P1 or up to 100 kPa of vacuum on P2, or a

differential pressure up to 100 kPa between P1 and P2. Any

of these sources will produce the same output.

The primary output is a 10 segment LED bar graph, which

is labeled in increments of 10 kPa. If full scale pressure is

adjusted for a value other than 100 kPa the bar graph may be

read as a percent of full scale. An analog output is also

provided. It nominally supplies 0.5 volts at zero pressure and

4.5 volts at 100 kPa. Zero and full scale adjustments are made

with potentiometers so labeled at the bottom of the board.

Both adjustments are independent of each other.

ELECTRICAL CHARACTERISTICS

The following electrical characteristics are included to

describe

evaluation

board

operation.

They

are

not

specifications in the usual sense and are intended only as a

guide to operation.

Characteristic

Symbol

Min

Typ

Max

Units

Power Supply Voltage

B+

6.8

—

13.2

Volts

Full Scale Pressure

PFS

—

100

kPa

Overpressure

PMAX

—

700

kPa

Analog Full Scale

VFS

—

4.5

—

Volts

Analog Zero Pressure

Offset

VOFF

—

0.5

—

Volts

Analog Sensitivity

SAOUT

—

mV/kPa

Quiescent Current

ICC

—

Full Scale Current

IFS

—

140

—

CONTENT

Board contents are described in the following parts list,

schematic, and silk screen plot. A pin by pin circuit description

follows in the next section.

PIN–BY–PIN DESCRIPTION

B+:

Input power is supplied at the B+ terminal. Minimum input

voltage is 6.8 volts and maximum is 13.2 volts. The upper limit

is based upon power dissipation in the LM3914 assuming all

10 LED’s are lit and ambient temperature is 25

°C. The board

will survive input transients up to 25 volts provided that power

dissipation in the LM3914 does not exceed 1.3 watts.

OUT:

An analog output is supplied at the OUT terminal. The signal

it provides is nominally 0.5 volts at zero pressure and 4.5 volts

at 100 kPa. This output is capable of sourcing 100

µA at full

scale output.

GND:

There are two ground connections. The ground terminal on

the left side of the board is intended for use as the power

supply return. On the right side of the board, one of the test

point terminals is also connected to ground. It provides a

convenient place to connect instrumentation grounds.

TP1:

Test point 1 is connected to the zero pressure reference

voltage and can be used for zero pressure calibration. To

calibrate for zero pressure, this voltage is adjusted with R6 to

match the zero pressure voltage that is measured at the

analog output (OUT) terminal.

TP2:

Test point 2 performs a similar function at full scale. It is

connected to the LM3914’s reference voltage which sets the

trip point for the uppermost LED segment. This voltage is

adjusted via R5 to set full scale pressure.

P1, P2:

Pressure and Vacuum ports P1 & P2 protrude from the

MPX5100 sensor on the right side of the board. Pressure port

P1 is on the top and vacuum port P2 is on the bottom. Neither

is labeled. Either one or a differential pressure applied to both

can be used to obtain full scale readings up to 100 kPa (15 psi).

Maximum safe pressure is 700 kPa.

* 100 kPa = 14.7 psi, 15 psi is used throughout the text for convenience

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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