Nexisense MEMS Sensor Series: Miniature High-Integration Solutions Empowering IoT, Medical, and Industrial Intelligent Sensing Systems

MEMS (Micro-Electro-Mechanical Systems) technology achieves high integration of sensors, actuators and circuits through silicon-based microfabrication, and has become the core driving force for modern sensing systems evolving toward miniaturization, low power consumption and high reliability. The Nexisense MEMS sensor product line covers gas detection, infrared temperature measurement, flow measurement, pressure sensing and environmental temperature-humidity monitoring, providing engineering-grade solutions from bare die to complete modules, meeting the stringent requirements of medical devices, industrial automation, smart appliances and IoT nodes.

Core Technologies and Engineering Characteristics of MEMS Sensors

The Nexisense series adopts CMOS-compatible MEMS process, combined with Si-based micro-hotplate, capacitive/piezoresistive/thermopile structures and ASIC signal processing, achieving chip-level integration and digital output.

Typical characteristics include:

• · Size: Typical<5×5mm bare die, module <15×15mm

• · Power consumption: Most<1mW, standby <10μA

• · Interfaces: I²C, SPI, UART TTL, analog voltage, RS485 Modbus RTU

• · Operating range: -40°C to +85°C (some extended to +125°C)

• · Long-term stability: Annual drift

  <1%, passed="" high-temperature="" high-humidity="" accelerated="" life="" test="">10 years

These characteristics support battery-powered nodes and large-scale array deployment, while maintaining high signal-to-noise ratio and vibration resistance.

Typical Application Scenarios and Integration Solutions

MEMS gas sensor based on micro-hotplate + MOx material, detects CH4, CO, VOC, H2, NH3 etc., sensitivity ppm level, response<10s. Integration solution: I²C/UART access to MCU, realizing gas alarm, air quality monitoring or industrial leak warning, supporting fusion compensation with temperature-humidity data to address cross-interference.

Thermopile infrared temperature sensor hundreds of thermocouple pairs in series, utilizing Seebeck effect to achieve non-contact temperature measurement, resolution<0.1°C. Applicable to home appliances (such as air conditioner outlet temperature control), medical forehead thermometers and industrial thermal imaging. Digital output module supports SPI/I²C, convenient for embedded system integration.

MEMS gas flow sensor thermal principle, range covering 0-200SLM, accuracy ±2%FS, response<5ms. Typically integrated in ventilator proximal/distal flow monitoring, connected to host through linear analog or digital interface, realizing tidal volume and PEEP closed-loop control.

Plastic-packaged pressure sensor piezoresistive MEMS chip + plastic encapsulation, range 0-100kPa to several MPa, accuracy ±0.5%FS. Applicable to automotive TPMS, electronic blood pressure monitors and industrial process control, supporting SMD mounting and wide-temperature operation.

MEMS temperature-humidity sensor capacitive humidity + resistive/bandgap temperature composite, accuracy ±1.5%RH / ±0.2°C, I²C interface. Widely used in HVAC, smart thermostats and data center environmental monitoring, supporting multi-node bus networking.

Project Application Cases

In a ventilator upgrade project of a certain medical device manufacturer, Nexisense MEMS gas flow sensor was integrated into the proximal module, combined with pressure sensor to achieve precise tidal volume and airway pressure monitoring. The system interfaces with main controller via UART, response time<5ms, compliant with ISO 80601-2-12 standard. After bulk deployment, equipment volume reduced by 30%, power consumption significantly decreased.

In another smart appliance platform project, Nexisense MEMS temperature-humidity + gas sensor combination was embedded in central air conditioner and fresh air host. I²C bus access to edge controller, realizing IAQ index driven fan regulation and VOC warning. Project operation data shows energy efficiency improvement of more than 15%.

These cases demonstrate the actual contribution of MEMS sensors in system-level miniaturization and performance optimization.

Selection Guide and Integration Considerations

Selection Key Points

• · Detection target and range: Gas select MOx type targeting specific VOC, flow prioritize thermal low pressure drop design, pressure match application medium and overload requirement.

• · Interface and power: Low-resource MCU select I²C/SPI, industrial networking prioritize Modbus RTU, battery node emphasize<10μA standby.

• · Package form: SMD/plastic package suitable for automated mounting, lensed thermopile applicable to non-contact temperature measurement.

• · Environmental adaptation: Evaluate vibration, temperature-humidity and medium corrosion, select corresponding protection level.

Integration Considerations

• · Installation layout: Gas/flow sensors need to ensure smooth airflow, avoid dead zones and turbulence; thermopile needs to align with field of view and add optical filter.

• · Electrical compatibility: I²C/SPI bus length<50cm no need for buffer, Modbus recommend shielded cable + 120Ω terminating resistor.

• · Compensation and calibration: Utilize built-in temperature compensation, host side can implement dynamic zero tracking; bulk projects recommend whole-machine environmental aging and on-site calibration.

• · EMC design: Add shielding cover when close to high-frequency circuits, prevent switching noise from affecting weak signal reading.

Nexisense OEM/Customization and Bulk Supply Advantages

Nexisense provides full-chain OEM/ODM services from MEMS die to packaged module, customizable sensitive materials, range, output protocol and form factor interface. Supports firmware layer custom compensation algorithm, alarm threshold and heartbeat reporting. Bulk supply (MOQ starting from 5k) enjoys stable supply chain, batch consistency verification and high-temperature high-humidity/vibration aging test, ensuring shipment reliability and fast response cycle.

Frequently Asked Questions (FAQ)

1. What are the main performance differences between Nexisense MEMS gas sensor and traditional thick-film sensor? MEMS adopts silicon-based micro-hotplate, power consumption reduced to mW level, volume reduced by more than 80%, response time<10s, and stronger anti-vibration performance, suitable for portable and battery-powered equipment.

   
   

2. How does thermopile infrared sensor achieve high repeatability in non-contact temperature measurement? 

Hundreds of thermocouple pairs in series increase output voltage, combined with ASIC temperature compensation and field of view calibration, typical repeatability <±0.2°C, applicable to dynamic environments such as home appliance outlet monitoring.

3. How does MEMS gas flow sensor ensure low pressure drop and biocompatibility in ventilator applications? 

Thermal design pressure drop<50Pa, materials compliant with ISO 10993 biocompatibility, linear output supports direct ADC access, achieving tidal volume accuracy ±5%.

4. How is temperature drift controlled in plastic-packaged pressure sensor for automotive TPMS? 

Built-in multi-point temperature compensation circuit, annual drift <±0.5%FS, operating range -40°C to +125°C, meeting AEC-Q100 reliability requirements.

5. In bulk OEM projects, can specific accuracy and interface protocol of MEMS temperature-humidity sensor be customized?

 Supported, yes. Humidity accuracy can be adjusted to ±1%RH, temperature ±0.1°C, and Modbus register mapping or SPI slave address can be customized, development cycle usually 6-10 weeks.

6. How to handle I²C bus address conflict when integrating multi-sensor array? 

Nexisense module supports programmable address or multi-bus design, recommend using I²C multiplexer or switching to UART/SPI interface, avoiding conflict and improving scalability.

7. What accelerated test methods are used for MEMS sensor long-term stability verification? 

High-temperature high-humidity (85°C/85%RH 1000h), temperature cycling (-40~+125°C) and vibration test (10-2000Hz), combined with Arrhenius model to estimate >10 years field life.

8. How do MEMS pressure/flow sensors achieve compatibility with PLC system in industrial process control? 

Through RS485 Modbus RTU interface, supporting standard function codes to read real-time values and diagnostic registers, easy to access mainstream PLCs such as Siemens S7 or Rockwell, baud rate up to 115200bps.

Conclusion and Call to Action

Nexisense MEMS sensors provide efficient sensing foundation for system integrators and equipment manufacturers with miniature integration, high stability and flexible interfaces. Whether for medical precision instruments, next-generation smart appliances or industrial IoT deployment, we can provide targeted selection and engineering verification support.

Welcome medical device manufacturers, automotive electronics suppliers, home appliance OEM factories and industrial automation integrators to contact Nexisense, discuss how to integrate our MEMS solutions into your next-generation products. Send email to sales@nexisense.com or visit the official website to download technical specifications and sample application form.