IDT公司的ZMOD4410是用來檢測總揮發性有機物（TVOC）和監測室內空氣質量（IAQ）的氣體傳感器模塊，包括氣體檢測元件和CMOS信號調理IC（IDT的ZSSC3250）。模塊的檢測元件包括基于硅（Si）MEMS結構的加熱元件和金屬氧化物（MOX）化學電阻器，而信號調理器控制傳感器溫度和測量MOx導電率（氣體濃度的函數）.I2C接口高達400kHz，可調ADC分辨率，最高16位，內置用戶數據的非易失存儲器（NVM），工作溫度-40℃ 到65℃，工作電壓1.7V到3.6V，主要用在室內空氣檢測，用于健康和舒適的家庭，辦公室和個人環境的監視器，檢測有害材料和不健康條件如建筑材料煙霧。本文介紹了ZMOD4410主要特性，框圖，應用電路以及評估板ZMOD4410 EVK主要特性，通信板和傳感器板電路，材料清單和PCB設計圖。

　　Automation based on indoor ambient air quality （HVAC， airpurifiers， thermostats， etc.）The ZMOD4410 Gas Sensor Module is designed for detecting totalvolatile organic compounds （TVOC） and monitoring indoor airquality （IAQ）。 It is a 12-pin LGA assembly （3.0 x 3.0 x 0.7 mm） thatconsists of a gas sense element and a CMOS signal conditioning IC （IDT’s ZSSC3250）。 The module’s sense element consists ofheater element on a Si-based MEMS structure and a metal oxide（MOx） chemiresistor. The signal conditioner controls the sensortemperature and measures the MOx conductivity， which is afunction of the gas concentration.

　　The measurement results can be read via an I2C interface with theuser’s microprocessor， which processes the data to determine theTVOC concentration， IAQ rating and estimated carbon dioxide（eCO2） level. With its low operating current consumption， theZMOD4410 is an excellent choice for low-voltage and low-powerbattery applications. Built-in nonvolatile memory （NVM） stores theconfiguration 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）

　　? Multiplexed input channel for heater， resistance， andtemperature measurements

　　? Heater driver and regulation loop for constant heater voltageor constant heater resistance

　　? Internal auto-compensated temperature sensor; not stresssensitive

　　? I2C interface： up to 400kHz

　　? Configurable alarm/interrupt output with static and adaptivelevels

　　? Adjustable ADC resolution for optimal speed versusresolution： 16-bit maximum

　　? Built-in nonvolatile memory （NVM） for user data

　　? Extremely low average power consumption in low μW range

　　? 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

　　Physical Characteristics

　　? Wide operation temperature： -40℃ to 65℃

　　? Supply voltage： 1.7V to 3.6V

　　? Package： 12-LGA

　　? Assembly size： 3.0 x 3.0 x 0.7 mm

　　Available Support

　　? ZMOD4410 Evaluation Kit

　　? Manuals， application notes， and white papers

　　? Instructional videos

　　? Programming libraries， example codes， and algorithmsupport to optimize performance

　　? Third-party certification for compliance with well-acceptedinternational IAQ standards

　　ZMOD4410典型應用：

　　? Indoor air monitoring

　　? Monitor home， office，and personal environments for healthyconditions and comfort

　　? Detect hazardous materials and unhealthy conditions（e.g. fumes from construction materials）

　　? Automation based on indoor ambient air quality （HVAC， airpurifiers， thermostats， etc.）

　　圖1.ZMOD4410框圖

　　圖2.ZMOD4410應用電路圖

　　評估板ZMOD4410 EVK

　　The ZMOD4410 Evaluation Kit （EVK） is designed for evaluatingIDT’s ZMOD4410 Gas Sensor Module for TVOC. The total volatileorganic compounds （TVOC） measurement is one of the indicatorsfor indoor air quality （IAQ）。

　　The ZMOD4410 Evaluation Software allows Windows?-basedoperating systems to communicate with the ZMOD4410 EVK via aUSB connection on the user’s computer， which functions as amaster. The software and additional related documentation isavailable on the IDT website.

　　The EVK’s Communication Board （HiCom） handles the interfacebetween the user’s computer and the ZMOD4410 module mountedon the ZMOD4410 Sensor Board （Daughter Board）。 Note： Only oneCommunication Board with one Sensor Board can be connected tothe computer at a time.

　　The ZMOD4410 Evaluation Kit uses an FDTI controller on theCommunication Board to handle the USB protocol， translatecommunications， and synchronize communications with the I2Cinterface. 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 voltagein the typical range from 1.7V to 3.6V. Alternatively， the user’sexternal supply voltage can be used. The intensity of the adjacentLED is proportional to the supply voltage.

　　評估板ZMOD4410 EVK主要特性：

　　? User-friendly EVK expedites configuration and evaluation ofthe ZMOD4410 Gas Sensor

　　? The modular design of the EVK allows simple connection ofSensor Boards for different gas sensor derivatives and easyintegration with other sensor products via the I2C interface

　　? The required ZMOD4410 Evaluation Software is available fordownload on the IDT website， which also provides backgroundinformation on TVOC， gas sensing， and sensor programming.

　　? The bill of materials （BOM） and schematics for theZMOD4410 Communication Board and Sensor Board areprovided at 。

　　評估板ZMOD4410 EVK包括：

　　? ZMOD44xx HiCom Communication Board

　　? ZMOD4410 Sensor Board with ZMOD4410 Gas SensorModule

　　? 0.5m Type-B USB to Micro-USB Cable

　　圖3.評估板ZMOD4410 EVK外形圖

　　圖4.評估板ZMOD4410 EVK通信板電路圖（1）

　　圖5.評估板ZMOD4410 EVK通信板電路圖（2）

　　圖6.評估板ZMOD4410 EVK傳感器板電路圖

　　評估板ZMOD4410 EVK通信板材料清單：

　　評估板ZMOD4410 EVK傳感器板材料清單：

　　圖7.評估板ZMOD4410 EVK HiCom通信板PCB設計圖：頂層

　　圖8.評估板ZMOD4410 EVK HiCom通信板PCB設計圖：底層

　　圖9.評估板ZMOD4410 EVK 傳感器板PCB設計圖：頂層

　　圖10.評估板ZMOD4410 EVK 傳感器板PCB設計圖：底層

　　詳情請見：

　　https://www.idt.com/document/dst/zmod4410-datasheet

　　和https://www.idt.com/document/mae/zmod4410-evk-evaluation-kit-description

　　IDT_ZMOD4410-Datasheet_DST_20180522.pdf

　　IDT_ZMOD4410-EVK-Kit-Description_MAE_20180519.pdf