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[原创] IDT ZMOD4410 TVOC和IAQ气体传感器模块解决方案

关键词:传感器 气体传感器 HVAC 空气净化器 ZMOD4410

时间:2019-11-28 10:48:31       来源:中电网

IDT公司的ZMOD4410是用来检测总挥发性有机物(TVOC)和监测室内气体质量(IAQ)的气体传感器模块,12引脚LGA装配(3.0x 3.0x0.7 mm)包含了气体检测元件和CMOS信号调理IC,而模块检测元件有对基于Si的MEMS结构和金属氧化物(MOx)化敏电阻器的加热元件;信号调理控制传感器温度,并测量MOx导电率,它是气体浓度的函数.测量结果通过I2C接口(频率高达400kHz)由用户微处理器来读出,并处理数据来确定TVOC浓度,IAQ额度, 估算二氧化碳(eCO2)水平.取决于工作模式,ZMOD4410软件能产生控制信号,它能基于气味水平来触发动作.器件在低功耗工作模式,具有低工作电流.因此ZMOD4410在低电压和低功耗电池应用中是极好的选择,内置了非易失存储器(NVM)存储了配置参数,并提供任意用户数据存储空间.工作电压1.7V - 3.6V,主要用在室内空气监测,用于健康舒适的监测家庭,办公室和个人环境中.检测有害物质和非健康条件(如建筑材料产生的烟雾),基于室内环境空气质量(如HVAC,空气净化器,加热器等)的自动化等.本文介绍了ZMOD4410主要特性,框图,应用电路图以及评估板ZMOD4410 EVK主要特性,通信板和传感器板电路图,材料清单和PCB设计图.

The ZMOD4410 Gas Sensor Module is designed for detecting total volatile organic compounds (TVOC) and monitoring indoor air quality (IAQ) in different use cases. It is a 12-pin LGA assembly (3.0x 3.0x0.7 mm) that consists of a gas sense element and a CMOS signal conditioning IC. The module’s sense element con-sists of heater element on a Si-based MEMS structure and a metal oxide (MOx) chemiresistor. The signal conditioner controls the sensor temperature and measures the MOx conductivity, which is a function of the gas concentration.

The measurement results can be read via an I2C interface with the user’s microprocessor, which processes the data to determine the TVOC concentration, IAQ rating, and estimated carbon dioxide (eCO2) level. Alternatively, depending on the operation mode, the ZMOD4410 software can generate a control signal, which can trigger actions based on odor levels. With its low operating current consumption in Low-Power Operation Mode, the ZMOD4410 is an excellent choice for low-voltage and low-power battery appli-cations. Built-in nonvolatile memory (NVM) stores the configuration and provides space for arbitrary user data.

ZMOD4410主要特性:

 Measurement of total organic compounds (TVOC) concentrations and indoor air quality (IAQ)
 Module algorithm estimates carbon dioxide level (eCO2)
 Algorithm to set a control signal to trigger an external action based on IAQ and odor change
 Heater driver and regulation loop for constant heater voltage or constant heater resistance
 Internal auto-compensated temperature sensor; not stress sensitive
 I2C interface: up to 400kHz
 Configurable alarm/interrupt output with static and adaptive levels
 Adjustable ADC resolution for optimal speed versus resolution: 16-bit maximum
 Built-in nonvolatile memory (NVM) for user data
 Very low average power consumption down to 1mW
 Excellent for low-voltage and low-power battery applications
 No external trimming components required
 External reset pin (active-LOW)
 Customization for mobile and consumer applications
 Siloxane resistant
 Supply voltage: 1.7V to 3.6V
 Package: 12-LGA
 Assembly size: 3.0 x 3.0x 0.7 mm

ZMOD4410典型应用:

§ Indoor air monitoring
§ Monitor home, office, and personal environments for healthy conditions and comfort
§ Detect hazardous materials and unhealthy conditions (e.g., fumes from construction materials)
§ Automation based on indoor ambient air quality (HVAC, air purifiers, thermostats, etc.)

图1.ZMOD4410框图

图2.ZMOD4410应用电路图

评估板ZMOD4410 EVK

The ZMOD4410 Evaluation Kit (EVK) is designed for evaluating IDT’s ZMOD4410 Gas Sensor Module for TVOC. The total volatile organic compounds (TVOC) measurement is one of the indicators for indoor air quality (IAQ). In addition, a measurement mode is provided to trigger an external device (e.g., fan, ventilation) based on the air quality change.

The ZMOD4410 Evaluation Software allows Windows®-based operating systems to communicate with the ZMOD4410 EVK via a USB connection on the user’s computer, which functions as a master. The software and additional related documentation is available on the IDT website.

The EVK’s Communication Board (HiCom) handles the interface between the user’s computer and the ZMOD4410 module mounted on the ZMOD4410 Sensor Board (Daughter Board). Note: Only one Communication Board with one Sensor Board can be connected to the computer at a time.

The ZMOD4410 Evaluation Kit uses an FTDI controller on the Communication Board to handle the USB protocol, translate communications, and synchronize communications with the I2C interface. The Sensor Board includes a decoupling capacitor.

The Communication Board has devices mounted on both sides. The components on the top side generate a stable supply voltage. A potentiometer can be used to adjust the internal supply voltage in the typical range from 1.7V to 3.6V. Alternatively, the user’s external supply voltage can be used. The intensity of the adjacent LED is proportional to the supply voltage.

评估板ZMOD4410 EVK主要特性:

 User-friendly EVK expedites configuration and evaluation of the ZMOD4410 Gas Sensor
 Operates with IDT provided software; either with executable ZMOD4410 GUI or alternatively with firmware programming examples for Windows and Linux
 The modular design of the EVK allows simple connection of Sensor Boards for different gas sensor derivatives and easy integration with other sensor products via the I2C interface
 The required ZMOD4410 Evaluation Software is available for download on the IDT website, which also provides background information on TVOC, gas sensing, and sensor programming.
 Supports different methods of operation, including Low Power
 Additional pins to measure power consumption, supply voltage, and GPIO trigger for external device
 The bill of materials (BOM) and schematics for the ZMOD4410 Communication Board and Sensor Board are provided at www.IDT.com/ZMOD4410-EVK.

评估板ZMOD4410 EVK包括:

 ZMOD4410 HiCom Communication Board
 ZMOD4410 Sensor Board with ZMOD4410 Gas Sensor Module
 0.5m Type-B USB to Micro-USB Cable

图3.评估板ZMOD4410 EVK外形图

图4.ZMOD4410通信板(正面)跳线和连接图

图5.ZMOD4410通信板电路图(1)

图6.ZMOD4410通信板电路图(2)

图7.ZMOD4410传感器板电路图
通信板材料清单(BOM):


传感器板材料清单(BOM):


图8.HiCom通信板PCB布局图-顶层

图9.HiCom通信板PCB布局图-底层

图10.传感器板PCB布局图-顶层

图11.传感器板PCB布局图-底层
详情请见:
https://www.idt.com/cn/en/document/dst/zmod4410-datasheet
https://www.idt.com/cn/en/document/mae/zmod4410-evaluation-kit-user-manual
IDT_ZMOD4410-EVK_MAE_20190403.pdf
IDT_ZMOD4410-Datasheet_DST_20190730.pdf

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