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SMI

MEMS Pressure Sensing Solutions

Supporting customer success in Automotive, Medical and Industrial markets since 1991

Silicon Microstructures, Inc. (SMI)1991年開始在壓力感測器(Pressure Sensor)工業中一直扮演著重要的角色,成立於美國加州的FremontSMI一直生產最先進的硅壓力傳感器,工廠在美國加州城市Milpitas,座落於矽谷的中心地帶。2001年被德國elmos集團收購後,隸屬於ELMOS半導體公司在全球投資的多間公司組合之一。

SMI為汽車(胎壓監測器 / TPMS SM5420C, SM5108C, SM6841 & 進氣壓力感測器 / MAP SM68E, SM5420C) / 醫療(微壓力傳感器) / 工業市場提供眾多標準封裝產品,封裝形式從極小的SOIC-8到多功能的SOIC-16塑料封裝以方便靈活設計。也有不鏽鋼插腳的直插式DIP封裝,補償方面壓力從0/95PSI (-4 mbar)(-7 bar)範圍,SMI提供了類比(模擬 / Analog)和數位(數字 / Digital)接口的解決方案,以及不同層次的集成組合以滿足從無溫度補償到溫度補償Temperature compensation以及帶信號調節等要求。

SMI產品從超低壓到耐介質高壓,有表壓和絕壓配置。微壓力傳感器從Medical Application介入心臟病(SM1120)到用於CPAP治療睡眠呼吸窒息的呼吸系統設備(SM9541 / SM9543 / SM5852…) & 製氧機設備(SM9541 / SM5420…)。對於MEMS設計提供專業知識以及製程開發&生產。在工業上SMI壓力傳感器也應用於工廠車間,或是無塵室和實驗室或是VAV Control通風設備控製系統(SM9543 / SM9541, SM8582, SM5651/2)等有特殊要求的環境,更可應用於對整棟建築物的氣流控制,以及應用在風壓變送器 & 數字壓力表 & 壓力開闢…等,並可依需求選擇表壓(Gauge) / 差壓(Differential) / 絕壓。

 

產品分類

Medical Industrial Automotive
  • Respiration
HVAC Tire Pressure Monitoring Systems (TPMS)
  • BiPAP
VAV Controllers Manifold Air Pressure (MAP)
  • Ventilation
Pressure Transmitters

Diesel Particulate Filter (DPF)

Hospital Beds Liquid Level & Pressure Exhaust Gas Recirculation (EGR)
Fluid Evacuation Barometric Pressure Oil Pressure
Blood Pressure Process Control Side Air Bag
Wound Therapy Refrigeration Transmission Oil Pressure
    Seat Ergonomics

 

 

 

Medical  --  Low Pressure : SM9541 & SM3041

Sleep Apnea Treatment

Continuos Positive Airway Pressure (CPAP): Sleep apnea is a sleep disorder characterized by abnormal pauses in breathing or instances of abnormally low breathing, during sleep. CPAP uses mild air pressure to keep an airway open.

Pressure sensors supply feedback of the applied air pressure in the mask/delivery hose to a microcontroller. The microcontroller manages a motor-drive stage of a compressor to maintain the correct fan velocity necessary to generate the required air pressure.

Surgical Waste Management

Application: Healthcare waste management systems minimize risks to healthcare workers by eliminating harmful exposure to fluids and smoke in the operating room. The unit collects and disposes of surgical waste. It prevents contact with infectious fluids and surgical plumes.

The SM3041 pressure sensor is being used to measure vacuum (negative gauge) pressure.

 

 

 

Medical  --  Medium Pressure : SM6842 & SM3041

Blood Pressure Monitors

Requirements

  • Relative/gage pressure
  • Temperature Compensation & Calibration
  • Pressure range: 300 mmHg (~5.8 PSI)
  • Accuracy (typ., system): ±3 mmHg (±1%FS)
  • Op. temperature range (typ.): +5°C to +40°C (<90% rH

Patient Monitors

Application: In the hospital setting, patient monitors are taking multiple life signs such as blood pressure and monitoring various respiratory components such as breathing, oxygen delivery, and anesthesia.

The SM3041 and SM9541 Series pressure sensors are being used to measure low and medium pressure.

 

 

Industrial --  Low Pressure : SM6842 & SM9541 & SM5420C

Filter Guard

Filter Performance Monitoring: Media air cleaners capture airborne particles passing through the filter. Pressure sensor in door indicates pressure drop and transmits to wireless receiver, which indicates filter replacement.

Water-Level Detection

Liquid Level Measurment: With growing water conservation and environment regulation, water level accuracy is paramount.  Accuracy down to  +/- 1mm of water column is necessary in some cases.

The SM9541 and SM9540 Series provide low pressure measurement in the 300 to 500 mm H2O range.

 Valve Positioner

Intelligent digital valve controllers

With advances in building technology and energy efficiency mandates, pressure sensors are used for valve positioning and monitoring of supply pressure.  Regulation of temperature and airlfow is key and managed with pressure monitoring systems.

The SM5420C Series provides remote ambient pressure measurement for intelligent valve controllers.

 

 

Automotive  --  Ultra Small Sensors : SM5420C & SM5108

Tire Pressure Monitoring Systems (TPMS)

Legislation in USA (2007) requires all new cars to be equipped with TPMS.

2013 – Europe started with 100% compliance in 2014.

2014 – South Korea confirmed legislation.

2017 – Japan intends to legislate.

2018 – China intends to legislate.

2019 – India intends to legislate.

SMI Offers Low Cost, Reliable Solution:

Gen-1:  Small Size

Automotive Qualified, High Volume

Gen-2:  Buried Cavity, All Silicon

Pedestrian Protection

During collision a sealed air hose integrated into front bumper is distorted. Two pressure sensors at both ends of hose detect impact through resulting pressure changes. A mechanism to lift the hood of the car towards the pedestrian is activated.

Side Airbag

Side impacts still cause about 35% of fatalities. Due to shorter distances the firing decision of a side airbag needs to be much faster than for a front crash. When the door is compressed at side impact the sensor provides a signal pulse proportional to the pressure change inside the door frame.

 

 

Product Overview - Areas of Expertise

 

 

 

Pressure Sensor Portfolio