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CozIR-LP2 Data Sheet

Product catalog summary

Introduction: The CozIR®-LP2 is a low power NDIR CO2 sensor designed for applications requiring power efficiency, such as battery-powered and wireless systems. It features advanced solid-state LED optical technology and a built-in auto-zero function to ensure measurement accuracy over its lifetime.

Features: Key features include low power consumption, 30ppm typical measurement accuracy, solid-state NDIR LED optical technology, and UART or I2C control and data interface. The sensor also includes a built-in auto-zeroing function.

Applications: The sensor is ideal for air quality and HVAC systems, building management systems, demand-controlled ventilation systems, IoT and smart technology wireless equipment, and indoor air quality equipment.

Specifications: The sensor operates with supply voltages from -0.3V to +6.0V, within an operating temperature range of 0°C to +50°C, and a humidity range of 0 to 95% RH, non-condensing. It measures CO2 concentrations from 0 to 10,000 ppm with an accuracy of ±(30, +3% of reading) at 25°C.

Electrical Characteristics: The sensor's input and output voltage levels are specified, with a current consumption of 15mA during sampling. It operates in different modes with varying power consumption.

Method of Operation: The sensor can operate in either I2C or UART interface mode, determined by the I2C_ENABLE pin state at power-up. It automatically starts taking measurements upon power application.

Measurement Cycle: In I2C mode, data can be read at any rate up to the maximum I2C read rate. In UART mode, the sensor takes two readings per second.

Digital Filter and Zero Point Setting: The sensor uses a digital filter to reduce noise, with adjustable settings. The zero point can be set using known gas concentrations, nitrogen, or fresh air, with auto-zeroing enabled by default.

Altitude Compensation: The sensor compensates for altitude-related pressure changes, with a default calibration at 1013mbar. Users can adjust the compensation based on altitude.

Control Interface Selection: The control interface is selected via the I2C_ENABLE pin at power-up, allowing for either UART or I2C communication.

I2C Interface Mode: The sensor operates as a slave device on a 2-wire serial bus, with a unique 7-bit address. Data transfer involves reading or writing 1-4 bytes of data, with specific timing parameters.

UART Interface Mode: Activated by leaving the I2C_ENABLE pin floating, suitable for direct connection to a UART. It operates at a fixed baud rate of 9600 bits/s.

Key Commands: Commands for zero-point calibration, CO2 measurement, altitude compensation, auto-zero configuration, and digital filter settings are detailed, with specific syntax and expected responses.

Recommendations: Users are advised to regularly update the sensor's firmware and verify configuration settings to maintain accuracy. The document emphasizes the importance of using the correct scaling factor for ppm conversion.

Limitations: The sensor is not intended for life support systems or applications where failure could result in significant harm. Users must implement adequate safety measures in their designs.

Important Notices: Legal disclaimers emphasize the need for users to verify information and assume responsibility for their applications.

Catalog excerpts

CozIR®-LP2 Low Power CO2 Sensor DESCRIPTION The CozIR®-LP2 is a low power NDIR CO2 sensor using state-of-the-art solid-state LED optical technology. The low power LEDs are manufactured in-house, giving GSS complete control of the CO2 sensor signal chain. The CozIR®-LP2's low power consumption is compatible with battery powered operation, allowing the sensor to be used in a wide variety of applications including wirelessly connected equipment. The CozIR®-LP2 operation is configurable depending on user requirements. On power-up, the CozIR®-LP2 automatically starts taking measurements. Measurements can be streamed or output on request. The CozIR®-LP2 also features a built-in autozero function that maintains CO2 measurement accuracy over the lifetime of the product. BLOCK DIAGRAM FEATURES • Low power CO2 sensor • 30ppm typical measurement accuracy • Solid state NDIR LED optical technology • UART or I2C control and data interface • Built-in auto-zeroing APPLICATIONS • Air Quality and HVAC • Building management systems (BMS) • Demand-Controlled Ventilation (DCV) systems • IoT and Smart Technology wireless equipment • Indoor Air Quality (IAQ) equipment Production Data, Revision 4.9, 23 June 2021 Page | 1 For regular updates, go to https://www.gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

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See separate data sheet for CozIR®-LP2 evaluation kit options. Notes: 1. Sensors are shipped individually or in trays 2. Tray quantity = 50 Gas Sensing Solutions Ltd. Page | 4 For regular updates, go to https://www.gassensing.co.uk Production Data, Revision 4.9, 23 June 2021 Copyright © 2021 Gas Sensing Solutions Ltd

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CozIR®-LP2 Low Power CO2 Sensor PACKAGE DRAWING Bottom View Weight = ~2.5g Gas Sensing Solutions Ltd. Page | 5 For regular updates, go to https://www.gassensing.co.uk Production Data, Revision 4.9, 23 June 2021 Copyright © 2021 Gas Sensing Solutions Ltd.

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CozIR®-LP2 Low Power CO2 Sensor PIN-OUT DESCRIPTION Production Data, Revision 4.9, 23 June 2021 Page | 6 For regular updates, go to https://www.gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

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CozIR®-LP2 Low Power CO2 Sensor ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are stress ratings only. Permanent damage to the CozIR®-LP2 may be caused by continuously operating at or beyond these limits. The CozIR®-LP2 functional operating limits and guaranteed performance specifications are given at the test conditions specified. ESD Sensitive Device. This sensor uses ESD sensitive components. It is therefore generically susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. Production Data, Revision 4.9, 23...

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CozIR®-LP2 Low Power CO2 Sensor PERFORMANCE CHARACTERISTICS Test Conditions Unless Otherwise Specified VDD = 3.3V, GND = 0V. CO2 = 450ppm, RH = 0% non-condensing, T= 25°C, Pressure = 1013mbar Production Data, Revision 4.9, 23 June 2021 Page | 8 For regular updates, go to https://www.gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

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CozIR®-LP2 Low Power CO2 Sensor POWER CONSUMPTION Test Conditions Unless Otherwise Specified The CozIR®-LP2 current consumption varies in time over the measurement cycle. The LED is pulsed, which results in a peak current when taking measurements of approximately 15mA. A typical current consumption profile after power-on is shown below. Production Data, Revision 4.9, 23 June 2021 Page | 9 For regular updates, go to https://www.gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

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CozIR®-LP2 Low Power CO2 Sensor METHOD OF OPERATION The CozIR®-LP2 is designed for low power applications where power is often at a premium. When the sensor is switched on, the state of the I2C_ENABLE pin is sampled. Setting the I2C_ENABLE pin low puts the CozIR®-LP2 into I2C interface mode. Leaving the I2C_ENABLE pin floating puts the CozIR®-LP2 into UART interface mode. In UART mode, the sensor automatically starts to automatically take measurements, 2 readings per second. Data can be read out once the READY pin is pulsed high in either UART or I2C interface mode. POWER ON DATA READY After...

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CozIR®-LP2 Low Power CO2 Sensor MEASUREMENT CYCLE Writing to or reading from the CozIR®-LP2 sensor is gated by the status of the READY pin. In both UART and I2C interface mode, the sensor will not respond when the READY pin is high. The READY pin is set high for approximately 16.5ms when the sensor is taking measurements every 0.5 seconds. The control interface is available approximately 14ms after the falling edge of a valid READY pulse. The sensor will only respond correctly when the READY pin is low. Production Data, Revision 4.9, 23 June 2021 Page | 11 For regular updates, go to https://www.gassensing.co.uk...

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CozIR®-LP2 Low Power CO2 Sensor MEASUREMENT CYCLE - I2C INTERFACE MODE • Apply power to the Sensor • The sensor will automatically start taking measurements. • Data can be read out at any rate up to the maximum I2C read rate • Measurement data is updated every 0.5 seconds MEASUREMENT CYCLE - UART INTERFACE MODE • Apply power to the Sensor • The sensor will automatically start taking measurements. • The sensor takes a measurement at 2 readings per second • The UART baud rate is fixed at 9600 baud • Measurement data is updated every 0.5 seconds Production Data, Revision 4.9, 23 June 2021 Page |...

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CozIR®-LP2 Low Power CO2 Sensor DIGITAL FILTER The CO2 gas chamber is illuminated with a nominal 4.25um wavelength LED and the signal received using a photo-diode. The signal from the photo-diode is processed and filtered by the sensor to remove noise and provide an accurate CO2 reading. High frequency noise coming from the sampling process is removed using a proprietary lowpass filter. The digital filter setting can be varied from 1255, allowing the user to reduce measurement noise at the expense of the measurement response time. Filter = 1 is the same as unfiltered. The ideal digital filter...

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