SP1602S01RB-PCB/NOPB National Semiconductor, SP1602S01RB-PCB/NOPB Datasheet

SP1602S01RB-PCB/NOPB

Manufacturer Part Number

SP1602S01RB-PCB/NOPB

Description

WEBENCH BARE BD BRDG DIFF-ADC

Manufacturer

National Semiconductor

Series

WEBENCH® Buildit Boardr

Datasheet

1.SP1602S01RB-PCBNOPB.pdf (6 pages)

Specifications of SP1602S01RB-PCB/NOPB

Main Purpose

Interface, Sensor to ADC Interface, Differential Sensor

Embedded

Utilized Ic / Part

10-MSOP Package

Primary Attributes

WEBENCH Sensor Designer, Differential Bipolar Pressure Sensor Amplifier, Diff-Input ADC

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Secondary Attributes

Other names

551600261-001
551600261-001
SP1602S01RB-PCB

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No. 115

Feature Article ............... 1-4

Design Made Easy .............5

SIGNAL PATH designer

Tips, tricks, and techniques from the analog signal-path experts

Liquid-Level Monitoring Using

a Pressure Sensor

— By Amy Le, Applications Engineer

prevent spillage. Draining liquid out of a silo into bottles also requires liquid-

level monitoring for volume control.

Th is article will explain how to automate a liquid monitoring system using

a pressure sensor. Since obtaining the pressure is just one vital piece of the

information, how to convert the sensor’s output voltage into the liquid’s

height using an analog-to-digital converter (ADC) will also be explained.

Details of the pressure sensor, ADC connections, system calibration and

calculations, as well as an example application, are available to guide designers

through the development phase.

Level-Sensing Theory

Th e height of liquid in a container can be measured using a

pressure sensor. Placed at the top of the container, the pressure

sensor is connected to an open-ended tube that is submerged

in the container. Th e amount of water in the container exerts

a proportional amount of pressure on the sensor via the trapped

air in the tube. At its output, the sensor produces a pressure-

equivalent voltage.

Essentially, the pressure sensor is a Wheatstone Bridge

(Figure 1). Changes to the pressure on the bridge are analogous

to the changes in the value of the bridge’s resistors, R.

iquid-level monitoring plays an important role in today’s automotive,

oil, water, pressure, and gas industries, to name a few. For example,

pumping oil into a storage tank requires liquid-level monitoring to

Figure 1. Bridge Sensor

SENSE

Figure 2. Container

Pressure Sensor

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SP1602S01RB-PCB/NOPB Summary of contents

Page 1

SIGNAL PATH designer Tips, tricks, and techniques from the analog signal-path experts No. 115 Feature Article ............... 1-4 Design Made Easy .............5 Liquid-Level Monitoring Using a Pressure Sensor — By Amy Le, Applications Engineer L iquid-level monitoring plays an important ...

Page 2

... It is important to select the pres- sure sensor appropriate for a given application. National Semiconductor’s Sensor WEBENCH online design tool (national.com/appinfo/webench/ sensorpath.html) can help customers in choosing the appropriate sensor based on input range and desired accuracy. Sensor Reference Board National’ ...

Page 3

SIGNAL PATH designer Finding the gain of any ampliﬁ er stage can be cumbersome. For simpliﬁ cation, an example calcu- lation for the instrumentation ampliﬁ er (Figure 4) used in the example application can be seen in a series of ...

Page 4

SIGNAL PATH designer Liquid-Level Monitoring Using a Pressure Sensor Pump IN1 IN_ADC Figure 6. Hysteresis V , then the comparator’s output is high; REF_COMP otherwise, it’s low. As shown in Figure 6, hysteresis is added to ...

Page 5

Discover a wealth of Find the perfect mix of design resources products for your design Explore “how to” videos, Use National’s online product online courses, articles, catalog, downloadable and the latest design collateral, and featured online technologies. sites to ...

Page 6

... Also, be sure to check out our Power Designer! View online today at: power.national.com/designer ©2008, National Semiconductor Corporation. National Semiconductor, , WEBENCH, and Signal Path Designer are registered trademarks of National Semiconductor. All other brand or product names are trademarks or registered trademarks of their respective holders. All rights reserved. ® ...

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