MPXM2102AS datasheet(382/670 Pages) MOTOROLA

382 / 670 page

AN1309

3–236

Motorola Sensor Device Data

www.motorola.com/semiconductors

EVALUATION BOARD DESCRIPTION

The information required to use evaluation board number

DEVB147 follows, and a discussion of the design appears in

the Design Considerations section.

FUNCTION

The evaluation board shown in Figure 1 is supplied with an

MPX2100DP sensor and provides a 100 kPa full scale

pressure measurement.

It has two input ports. P1, the

pressure port, is on the top side of the 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% of full scale, or 10 kPa with the

MPX2100 sensor. An analog output is also provided.

nominally supplies 0.5 volts at zero pressure and 4.5 volts at

full scale. Zero and full scale adjustments are made with

potentiometers so labeled at the bottom of the board. Both

adjustments are independent of one another.

ELECTRICAL CHARACTERISTICS

The following electrical characteristics are included as a

guide to operation.

Characteristic

Symbol

Min

Typ

Max

Units

Power Supply Voltage

B+

6.8

—

13.2

dc 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

—

160

—

CONTENT

Board contents are described in the parts list shown in

Table 1. A schematic and silk screen plot are shown in Figures

2 and 6. A pin by pin circuit description follows.

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

average 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 full scale. Zero pressure voltage is adjustable and set with

R11. This output is designed to be directly connected to a

microcomputer A/D channel, such as one of the E ports on an

MC68HC11.

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 LM3914’s full scale

reference voltage which sets the trip point for the uppermost

LED segment. This voltage is adjusted via R1 to set full scale

pressure.

TP2:

Test point 2 is connected to the +5.0 volt regulator output.

It can be used to verify that supply voltage is within its 4.75 to

5.25 volt 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 and vacuum port P2 is on the bottom. Neither port is

labeled. Maximum safe pressure is 700 kPa.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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