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AN3728

更新时间： 2024-02-16 22:42:23

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		传感器压力传感器
页数	文件大小	规格书
4页	89K
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Media Compatibility for IPS PRT Pressure Sensors

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AN3728 数据手册

AN3728

Rev 1, 07/2008

Freescale Semiconductor

Application Note

Media Compatibility for

IPS PRT Pressure Sensors

by: Ryan Hooper

John Young

Freescale Semiconductor, Inc., Tempe, AZ

INTRODUCTION

What is the term Media Compatibility, and how does it affect

Pressure Sensors? Media is any chemical compound, in

liquid, solid or gas which interacts with the sensor where the

sensing of pressure is done either directly through this

chemical, or by measuring the pressure of a gas containing a

certain amount of this chemical. Media Compatibility is

presented here as the various media that our sensor can

sense pressure with, either directly or through an air column.

While this document will lay groundwork for compatible

chemical media, it will not serve as a qualification guarantee.

The only method we endorse fully is the utilization of a

pressure sensor with clean, dry air.

Figure 1. Cross Section of Unibody Pressure Sensor

RELIABILITY

This document will cover the Media Compatibility of these

Integrated Pressure Sensors (IPS) Piezo-Resistive

Transducer (PRT) technology Pressure Sensors. Looking at

the cross section of a Unibody pressure sensor in Figure 1,

the gel layer is evident over the die. Force or pressure is

transferred through the gel to the sensing element on the die.

The gel coat protects the die and wire bonds that are

encapsulated within and is available as a standard

Fluorosilicone or Media Resistant gel. The Media Resistant

option is the default choice in sensor selection for an

application that may call for added protection over the

Fluorosilicone gel. When a corrosive is introduced to the

sensor that is not compatible, it has the potential to dissolve,

or be absorbed by the gel and corrupt the die surface or lead

to wire-bond breakage. Some types of media will take longer

to corrupt the die than others, so a disposable application is

possible. Knowing how to make the sensor last for longetivity

with/without media can accelerate or slow down the lifetime of

the sensor.

Reliability of the sensor can be improved by Pulse biasing

the pressure sensor. This turns the sensor on and off to

improve the lifetime of the sensor and is a typical standard

practice for PRT sensors. With corrosive media, this will not

improve sensor lifetime if the media is expected to eventually

corrupt the sensor. The sensor will also not survive in a

corrosive or non-corrosive environment with direct contact

with liquid media. Eventually the die or wire-bonds will be

compromised by the chemical interaction in the long term.

This is not to say that Pulse biasing should be avoided

completely. This is standard practice to improve typical sensor

lifetimes in typical applications.

Another method to prolong lifetime is to un-bias the sensor

during sudden cold to hot cycling. The gel layer is a good

protection layer against liquid moisture from contacting wire-

bonds or die level. However if this is saturated in a harsh

environment during cold-hot cycling, condensation can build

up. During the hot cycle this can lead to the possibility of

12 3 4

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