CozIR-LP3 Data Sheet
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CozIR®-LP3 Low Power CO2 Sensor DESCRIPTION The CozIR®-LP3 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®-LP3'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®-LP3 operation is configurable depending on user requirements. On power-up, the CozIR®-LP3 automatically starts taking measurements. Measurements can be streamed or output on request. The CozIR®-LP3 also features a built-in autozero function that maintains CO2 measurement accuracy over the lifetime of the product. BLOCK DIAGRAM FEATURES • Low power <3mW average • 30ppm typical measurement accuracy • Solid state NDIR LED optical technology • UART or I2C control and data interface • Analogue or digital CO2 measurements • Built-in auto-zeroing • Altitude pressure compensation • Programmable alarm output 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 4.3, 23 June 2021 Page | 1 For regular updates, go to https://gassensing.co.uk Copyright © 2021 Gas Sensing Solution

For regular updates, go to https://gassensing.co.uk Production Data, Revision 4.3, 23 June 2021 Copyright © 2021 Gas Sensing Soluti

Gas Sensing Solutions Ltd. Page | 3 For regular updates, go to https://gassensing.co.uk Production Data, Revision 4.3, 23 June 2021 Copyright © 2021 Gas Sensing Solutio

See separate data sheet for CozIR®-LP3 evaluation kit options. Notes: 1. Sensors are shipped individually or in trays 2. Tray quantity = 50 Production Data, Revision 4.3, 23 June 2021 Page | 4 For regular updates, go to https://gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-LP3 Low Power CO2 Sensor PACKAGE DRAWING Gas Sensing Solutions Ltd. Page | 5 For regular updates, go to https://gassensing.co.uk Production Data, Revision 4.3, 23 June 2021 Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-LP3 Low Power CO2 Sensor PIN-OUT DESCRIPTION - CozIR®-LP3 Production Data, Revision 4.3, 23 June 2021 Page | 6 For regular updates, go to https://gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-LP3 Low Power CO2 Sensor CONNECTION DIAGRAM Notes 1. The power on status of the sensor can be controlled with the PWR_ON pin. If this function is not required, the pin must be pulled high to VDD Gas Sensing Solutions Ltd. Page | 7 For regular updates, go to https://gassensing.co.uk Production Data, Revision 4.3, 23 June 2021 Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-LP3 Low Power CO2 Sensor ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are stress ratings only. Permanent damage to the CozIR®-LP3 may be caused by continuously operating at or beyond these limits. The CozIR®-LP3 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 4.3,...

CozIR®-LP3 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 4.3, 23 June 2021 Page | 9 For regular updates, go to https://gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-LP3 Low Power CO2 Sensor ELECTRICAL CHARACTERISTICS - RX_IN, TX_OUT, SDA, SCL, I2C_ENABLE, READY Production Data, Revision 4.3, 23 June 2021 Page | 10 For regular updates, go to https://gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-LP3 Low Power CO2 Sensor POWER CONSUMPTION Test Conditions Unless Otherwise Specified VDD = 3.3V, GND = 0V. CO2 = 450ppm, RH = 0% non-condensing, T= 25°C, Pressure = 1013mbar The CozIR®-LP3 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 4.3, 23 June 2021 Page | 11 For regular updates, go to https://gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-LP3 Low Power CO2 Sensor METHOD OF OPERATION The CozIR®-LP3 is designed for low power applications where power is often at a premium. Power-on is controlled by setting the state of the PWR_ON pin. This pin controls the on-board sensor power. If held low, the sensor will remain in a quiescent state. The sensor will not respond to any commands in this state. To turn the sensor on, set PWR_ON pin high. If unused, connect the PWR_ON pin permanently to VDD. When the sensor is switched on, and the PWR_ON pin connected to VDD or set high, the state of the I2C_ENABLE pin is sampled. Setting...

CozIR®-LP3 Low Power CO2 Sensor PARAMETER MEASUREMENT CYCLE Writing to or reading from the CozIR®-LP3 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. Gas Sensing Solutions Ltd. Production Data, Revision 4.3, 23 June 2021 Page |...

CozIR®-LP3 Low Power CO2 Sensor MEASUREMENT CYCLE - I2C INTERFACE MODE • • • • • • • Apply power to the Sensor and set PWR_ON high The sensor will automatically start taking measurements. The data READY flag is set low within 5ms of power on. The data READY flag will be pulsed high for approximately 16.5ms with data available 14ms after the falling edge of the data READY flag Data can be read out at any rate up to the maximum I2C read rate Measurement data is updated every 0.5 seconds Note when auto-zero is used, the auto-zero trigger event will extend the measurement time by ~2s...