IDT公司的ZMOD4410是總揮發性有機物（TVOC）和室內空氣質量傳感器，包括氣體檢測元件和CMOS信號調理IC.模塊的檢測元件基于Si的MEMS結構的加熱元件和金屬氧化物（MOx）化敏電阻器，而信號調理器控制傳感器溫度和測量MOx的導電率，它是氣體濃度的函數。工作電壓1.7V- 3.6V，主要用在室內空氣監測，包括家庭，辦公室和私人環境健康條件和舒適度，檢測有害物質和有害健康條件等。本文介紹了ZMOD4410主要特性，框圖，應用電路圖，以及包括通信板和傳感器板在內的評估板ZMOD4410 EVK主要特性，電路圖，材料清單和PCB設計圖。

　　The ZMOD4410 Gas Sensor Module is designed for detecting totalvolatile organic compounds （TVOC） and monitoring indoor airquality （IAQ） in different use cases. It is a 12-pin LGA assembly（3.0 x 3.0 x 0.7 mm） that consists of a gas sense element and a CMOS signal conditioning IC. The module’s sense element consistsof heater element on a Si-based MEMS structure and a metaloxide （MOx） chemiresistor. The signal onditioner controls thesensor temperature and measures the MOx conductivity， which isa function 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 stimated carbon dioxide（eCO2） level. Alternatively， depending on the operation mode， the ZMOD4410 software can generate a control signal， which cantrigger actions based on odor levels. With its low operating currentconsumption， the ZMOD4410 is an excellent choice for low-voltageand low-power battery applications. Built-in nonvolatile memory （NVM） stores the configuration and provides space for arbitraryuser 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 actionbased on IAQ and odor change

　　? 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

　　? Low average power consumption in the low mW 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

　　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.）Physical Characteristics

　　? Supply voltage： 1.7V to 3.6V

　　? Package： 12-LGA

　　? Assembly size： 3.0 x 3.0 x 0.7 mm

　　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 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.

　　評估板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.

　　? 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

　　評估板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

　　圖3.評估板ZMOD4410 EVK外形圖

　　圖4.評估板ZMOD4410 EVK通信板跳線和連接器位置圖

　　圖5.評估板ZMOD4410 EVK通信板電路圖（1）

　　圖6.評估板ZMOD4410 EVK通信板電路圖（2）

　　圖7.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8.評估板ZMOD4410 EVK通信板PCB設計圖：頂層

　　圖9.評估板ZMOD4410 EVK通信板PCB設計圖：底層

　　圖10.評估板ZMOD4410 EVK傳感器板PCB設計圖：頂層

　　圖11.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-user-manual

　　IDT_ZMOD4410-EVK_MAE_20180925.pdf

　　IDT_ZMOD4410-Datasheet_DST_20180924.pdf