*mydirectindustry

CozIR-LP3 Data Sheet

Product catalog summary

Description: The CozIR®-LP3 is a low power NDIR CO2 sensor that uses advanced solid-state LED optical technology. It is designed for low power consumption, making it ideal for battery-powered and wireless applications. The sensor is configurable and includes an auto-zero function to maintain measurement accuracy.

Features: Key features include low power consumption (<3mW), 30ppm measurement accuracy, solid-state NDIR LED technology, UART or I2C interfaces, analogue or digital outputs, built-in auto-zeroing, altitude pressure compensation, and programmable alarm output.

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

Specifications: Detailed specifications include absolute maximum ratings, recommended operating conditions, and performance characteristics. It also covers electrical characteristics for various interfaces and power consumption details.

Operation and Interfaces: The sensor supports both I2C and UART interface modes, with instructions on measurement cycles, digital filtering, and control interface timing. It includes methods for zero-point setting and auto-zero functions.

Commands and Configuration: The document outlines commands for sensor configuration and status checks, including zero setting, auto-zero control, and altitude pressure compensation.

Additional Information: Includes connection diagrams for both I2C and UART interfaces, a revision history, and an important notice section.

Ordering Information: The CozIR®-LP3 sensor is available in different measurement ranges: 2000ppm, 5000ppm, and 10,000ppm (1%). Sensors are shipped individually or in trays of 50.

Pin-Out Description: The sensor has several pins for various functions, including power supply, alarm output, data readiness, and interface mode selection. Key pins include PWR_ON, I2C_ENABLE, and READY.

Absolute Maximum Ratings: Operating conditions include supply voltage from -0.3V to +6.0V, operating temperature from 0°C to +50°C, storage temperature from -40°C to +70°C, and humidity from 0 to 95% non-condensing.

Recommended Operating Conditions: Supply voltage should be between 3.25V and 5.5V.

Performance Characteristics: The sensor measures CO2 levels with a range of 0 to 10,000ppm, with accuracy affected by temperature and pressure. It consumes 15mA peak current during sampling.

Power Consumption: The sensor has different power modes, including a sleep mode consuming 0.01mA. Current consumption peaks at 15mA during measurements.

Method of Operation: The sensor operates in low power mode, with power controlled by the PWR_ON pin. It supports both I2C and UART interface modes, automatically starting measurements upon power-on.

Measurement Cycle: The sensor takes two readings per second, with data available shortly after the READY pin is pulsed high. The measurement process can be paused to save power.

Digital Filter: The sensor uses a digital filter to reduce noise, adjustable from 1 to 255. The filter setting affects measurement accuracy and response time.

PWM_RS485 Output: The PWM_RS485 pin can be configured for PWM output or as a high/low digital output for controlling external devices.

Alarm Output: The sensor includes an alarm function that triggers when CO2 levels exceed a set threshold, with the alarm cleared when levels fall below 80% of the threshold.

Specifications and Features: The CozIR®-LP3 is a low power CO2 sensor with a built-in self-test function that checks for operational errors at power-on and during measurement cycles. Error conditions include sensor lifetime exceeding 20,000 hours, LED optical output out of range, CO2 value out of range, and ADC input signal out of range. The sensor returns a self-test value of 85 if nominal or 170 if errors are flagged.

Zero Point Setting: Zero-point setting is crucial for accurate CO2 measurement and can be done using known gas concentrations, nitrogen, or fresh air. The sensor stores only the latest zero-point setting. The auto-zero function resets the zero level using the lowest measured CO2 value (Zlowest) and is enabled by default.

Auto-Zero Function: The auto-zero function requires exposure to typical background CO2 levels (400-450ppm) and resets the zero level using Zlowest. The auto-zero period can be programmed, with initial and ongoing intervals set independently. Default values are 7 days for initial and 8 days for ongoing auto-zero in I2C mode.

Altitude Pressure Compensation: The sensor's gas concentration readings are pressure-dependent. Calibration is done at 1013mbar, and adjustments can be made by writing the actual or reference mean barometric pressure to the sensor.

Control Interface: The CozIR®-LP3 can be controlled via UART or I2C interfaces, selected by the I2C_ENABLE pin at power-up. In I2C mode, the sensor operates as a slave device with a unique 7-bit address and supports clock stretching.

I2C Register Map: The sensor's I2C register map includes addresses for measurement control, CO2 level, digital filter settings, zero control settings, auto-zero intervals, and more. Specific registers allow for reading and writing data, with some requiring a sensor zero after changes.

Measurement Control: The document outlines the control registers for the CozIR®-LP3 Low Power CO2 Sensor, detailing how to manage CO2 measurements, digital filters, and zero control settings. Register R0 controls the CO2 measurement state, while R2 and R52 provide CO2 level readings in ppm.

Zero Control Settings: Register R5 allows setting zero points for air, nitrogen, or a known CO2 concentration. The process involves writing target values to specific registers before initiating the zero process.

Auto-Zero Settings: Registers R6, R8, and R12 manage auto-zero intervals and target values, with default settings for initial and regular intervals and a default CO2 target of 400ppm.

Alarm and PWM Control: Register R44 sets the CO2 threshold for alarms, while R46 manages PWM output settings, including prescaler, resolution, mode, and output state.

Interface and Communication: The sensor supports I2C and UART interfaces. The I2C interface requires specific connections, while the UART mode is activated by leaving the I2C_ENABLE pin floating. UART commands must be terminated with a carriage return and line feed.

Operational Modes: The sensor operates in three modes: K0 (Command Mode), K1 (Streaming Mode), and K2 (Polling Mode). Each mode has specific functionalities and default settings.

Measurement Data Outputs: The sensor can output filtered and unfiltered CO2 data, configurable via the 'M' command. The CO2 measurement string includes both filtered and unfiltered values.

UART Interface Summary: The document provides a comprehensive list of UART commands for setting and reading various sensor parameters, including zero-point settings, alarm values, and measurement data types.

Catalog excerpts

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

Open the catalog to page 1

Open the catalog to page 2

Open the catalog to page 3

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.

Open the catalog to page 4

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.

Open the catalog to page 5

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.

Open the catalog to page 6

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.

Open the catalog to page 7

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, 23...

Open the catalog to page 8

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.

Open the catalog to page 9

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.

Open the catalog to page 10

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.

Open the catalog to page 11

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 the...

Open the catalog to page 12

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 | 13...

Open the catalog to page 13