1

Motorola Sensor Device Data

700 kPa

Uncompensated

Silicon Pressure Sensors

The MPX700 series device is a silicon piezoresistive pressure sensor providing a very

accurate and linear voltage output — directly proportional to the applied pressure. This

standard, low cost, uncompensated sensor permits manufacturers to design and add

their own external temperature compensating and signal conditioning networks.

Compensation techniques are simplified because of the predictability of Motorola’s single

element strain gauge design.

Features

• Low Cost

• Patented, Silicon Shear Stress Strain Gauge Design

• Linearity to ± 0.5% (Max) Linearity

• Easy to Use Chip Carrier Package Options

• Ratiometric to Supply Voltage

• 60 mV Span (Typ)

• Absolute, Differential and Gauge Options

Application Examples

• Environmental Control Systems

• Pneumatic Control Systems

• Appliances

• Automotive Performance Controls

• Medical Instrumentation

• Industrial Controls

Figure 1 illustrates a schematic of the internal circuitry on the stand–alone pressure

sensor chip.

Figure 1. Uncompensated Pressure Sensor Schematic

PIN 3

X–ducer

PIN 2

PIN 4

+ Vout

– Vout

+ VS

PIN 1

VOLTAGE OUTPUT versus APPLIED DIFFERENTIAL PRESSURE

The differential voltage output of the X–ducer is directly proportional to the differential

pressure applied.

The absolute sensor has a built–in reference vacuum. The output voltage will decrease

as vacuum, relative to ambient, is drawn on the pressure (P1) side.

The output voltage of the differential or gauge sensor increases with increasing

pressure applied to the pressure (P1) side relative to the vacuum (P2) side. Similarly,

output voltage increases as increasing vacuum is applied to the vacuum (P2) side

relative to the pressure (P1) side. This sensor is designed for applications where P1 is

always greater than, or equal to P2.

Senseon and X–ducer are trademarks of Motorola, Inc.

Order this document

by MPX700/D

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

BASIC CHIP

CARRIER ELEMENT

CASE 344–15, STYLE 1

DIFFERENTIAL

PORT OPTION

CASE 344C–01, STYLE 1

MPX700

SERIES

0 to 700 kPa (0 – 100 psi)

60 mV FULL SCALE SPAN

(TYPICAL)

NOTE: Pin 1 is the notched pin.

PIN NUMBER

1

2

Gnd

+Vout

3

4

VS

–Vout

REV 5