ZMOD4510 - Outdoor Air Quality Sensor Platform with Adjustable ADC resolution for optimal speed versus resolution
The ZMOD4510 Gas Sensor Module is designed for monitoring outdoor air quality (OAQ) and the measurement of outdoor relevant gases ozone and nitrogen oxide. 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 consists of a 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 outdoor air concentration.
The measurement results can be read via an I2C interface with the user’s microprocessor, which processes the data to determine an Outdoor Air Quality Rating defined by the US Environmental Protection Agency. Software upgradability makes the sensors in the ZMOD4510 platform capable of providing a variety of measurement options by varying the method of operation or changing the firmware used to interpret the measurements for gas selectivity. Downloadable firmware libraries and source code provided by IDT enables detection of OAQ Rating and supports smart devices implementation. The ZMOD4510 is ideal for outdoor air quality applications such as smart home building controls and other smart personal devices.
- Measurement of total outdoor air quality (OAQ)
- Algorithm to calculate the concentrations of outdoor gases
- 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
- External reset pin (active-LOW)
- Siloxane resistant
Application circuit diagram
The ZMOD4510-EVK creates an easy way to evaluate the ZMOD4510 Outdoor Air Quality sensor. While the ASIC inside the sensor module controls the actual MOx and MEMS sensing element, the MCU-based electronic module controls the I²C to USB communication interface. The system may be connected to a Windows PC via a bi-directional USB connection and the sensor may be tested by using the provided evaluation software. The output is shown as a raw signal (resistance), as the measured concentration for ozone and nitrogen oxides combined, and as a standardized outdoor air quality rating based on the US Environmental Protection Agency (EPA).
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