Gas Sensor Module for

Refrigeration Air Quality

ZMOD4450

Datasheet

© 2019 Integrated Device Technology, Inc.

1

October 30, 2019

ZMOD4450

Gas Sensor Module

VSS

VDD

VDDH

SDA

SCL

VSS

RES_N

Algorithms

Post-Processing

INT

Power

Supply

VDDIO

Description

The ZMOD4450 Gas Sensor Module is designed for detecting

gases associated with food ripening or rotting and is targeted for

use in refrigeration air quality (RAQ) applications; for example, food

storage and shipping. The sensor is a 12-pin LGA assembly (3.0



3.0

 0.7 mm) that consists of a gas sense element and a CMOS

signal conditioning IC. The module’s sense element consists of a

heater element on a silicon-based MEMS structure and a metal

temperature sensor. It 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

levels of gases present and to indicate the likelihood of food spoil-

age. With the ZMOD4450’s low operating current consumption, the

sensor is an excellent choice for low-voltage and low-power battery

applications. Built-in nonvolatile memory (NVM) stores the config-

uration and provides space for arbitrary user data.

Typical Applications



Refrigerator systems control



Measurement of fruit and vegetable quality



Monitors for fruit and vegetable shipping and storage

conditions for fruit and vegetable quality

Physical Characteristics



Target operation temperature: 0°C to 25°C



Supply voltage: 1.7V to 3.6V



Package: 12-LGA



Assembly size: 3.0

 3.0  0.7 mm

Available Support



ZMOD4450 Evaluation Kit



Manuals, application notes, and white papers



Instructional videos



Programming libraries, example codes, and algorithm

support to optimize performance

Features



Measurement of gases associated with food ripening and

storage: ethylene, amines, volatile sulfur compounds



Configurable methods of operation based on application and

use case



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



Low average power consumption in the mW range



Firmware upgradable platform for application optimizations,

such as ultra-low-power battery applications



No external trimming components required



External reset pin (active-LOW)



Customization for mobile and consumer applications



Siloxane resistant