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CozIR-Blink Data Sheet

CozIR-Blink Data Sheet

Product catalog summary

Overview: The CozIR®-Blink is an ultra-low power CO2 sensor developed by Gas Sensing Solutions Ltd. It utilizes advanced solid-state LED optical technology, designed for minimal power consumption, making it suitable for battery-powered or wireless applications. The sensor features a built-in auto-zero function to maintain measurement accuracy over time.

Specifications: The sensor operates with a supply voltage of 3.25V to 5.5V, within an operating temperature range of 0°C to +50°C, and a storage temperature range of -40°C to +70°C. It supports a humidity range of 0 to 95% RH, non-condensing, and measures CO2 levels from 0 to 10,000 ppm with an accuracy of ±(30, +3% of reading) ppm at 25°C.

Features: Key features include ultra-low power consumption (60uW per reading), 30ppm typical measurement accuracy, solid-state NDIR LED technology, UART or I2C control interfaces, and a built-in auto-zeroing function.

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

Ordering Information: Available in different measurement ranges (2000ppm, 5000ppm, 10,000ppm) and package options (with or without pins). Sensors are shipped individually or in trays of 50.

Pin-Out Description: The sensor includes pins for power supply, data input/output, and interface mode selection. The I2C interface requires external resistors, with mode selection based on the I2C_ENABLE pin status at power on.

Performance and Operation: The sensor's performance includes absolute maximum ratings, recommended operating conditions, and electrical characteristics. It operates by cycling power for measurements, with data ready signals and digital filter settings available for customization.

Control Interfaces: Supports both I2C and UART interface modes, with detailed timing and command protocols. The I2C interface involves writing to and reading from registers, while the UART interface includes specific command protocols for operation and calibration.

Calibration and Auto-Zero: Includes zero point calibration commands and an auto-zero function to ensure accurate CO2 level measurements. Altitude compensation is supported to adjust for pressure variations.

Electrical Characteristics: Input HIGH Level: 1.8V, Input LOW Level: 1.0V, Output HIGH Level: 2.6V, Output LOW Level: 0.4V.

Power Consumption: Peak Current: 15 mA during sampling, SLEEP Mode: 0.01 mA, Power Consumption: ~10µW per reading with a 300s interval.

Method of Operation: Designed to be power cycled, initiating a measurement automatically upon power-on. Data is available approximately 14ms after the READY pin is pulsed high. In UART mode, CO2 readings can be read once per power cycle. In I2C mode, readings can be accessed repeatedly until the next power cycle.

Measurement Cycle: Measurement time is approximately 3400ms with the default setting of 16 pulses. The sensor enters SLEEP mode after data is sent or read, conserving power until the next cycle.

Zero Point Setting: Zeroing can be done in a known gas concentration, nitrogen, or fresh air. Auto-zero function adjusts the zero point based on exposure to typical background CO2 levels.

Auto-Zero Function: Enabled by default and uses the lowest measured CO2 value to reset the zero point. The auto-zero interval is based on the number of power cycles and can be configured by the user.

Altitude Compensation: Measures gas concentration by light absorption, which is pressure-dependent. Calibration is done at 1013mbar, and adjustments can be made by setting the mean barometric pressure to correct for altitude effects.

Control Interface: Can be controlled via a serial interface configured as UART or I2C. The I2C_ENABLE pin determines the interface mode at power-up. I2C mode supports a frequency up to 100 kHz, while UART mode operates at a baud rate of 38,400 bits/s.

I2C Interface: Operates as a slave device with a unique 7-bit address. Supports clock stretching and data transfer in 1-4 bytes. The device address is 0x41.

Register Map: Key registers include CO2 Level (R2), Sensor Control Settings (R5), Auto-Zero Target (R12), and Altitude Pressure (R118). Some registers require a sensor zero after changing default values.

UART Interface: Commands are ASCII-encoded and terminated with \r\n. The sensor automatically transmits a CO2 reading upon receiving any character after power-up.

Best Practices: Ensure correct interface selection at power-up, perform sensor zeroing after changing critical settings, and use appropriate commands for calibration and data retrieval.

CO2 Level Measurement: Describes functionality, focusing on CO2 level measurement using UART commands. The CO2 measurement value is reported with the 'Z' command, which outputs the latest CO2 reading in parts per million (ppm). The response format includes a two-byte value followed by a status byte.

Scaling Factor: The 'Z' value must be converted to ppm using a scaling factor provided by the '.' command. For CozIR®-Blink, this multiplier is always 1.

nPulse Setting: The 'A' command sets the number of pulses, affecting power consumption. The 'a' command returns the current pulse setting.

Zero Point Calibration: Several commands ('G', 'U', 'u', 'X') are available for zero-point calibration using different gases or manual settings. The 'P' command sets CO2 levels for auto-zero and zero-point settings.

Altitude Pressure Compensation: The '[' command sets the pressure value in mbar, while the ']' command reads it.

Auto-Zero Interval: The '@' command sets the number of power cycles between auto-zero events, which can be disabled by setting it to 0.

Serial Number and Firmware Version: The 'Y' command returns the firmware version and sensor serial number.

Connection Diagram: A diagram is provided for UART interface connections between the sensor and master device.

Important Notice: Includes a disclaimer about the terms and conditions of sale, warranty, and liability limitations.

Revision History: Lists changes made in various revisions, highlighting updates to commands, descriptions, and technical specifications.

Catalog excerpts

CozIR®-Blink Ultra-Low Power CO2 Sensor DESCRIPTION The CozIR®-Blink is an ultra-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®-Blink uniquely allows users to reduce power consumption of the CO2 measurement to unprecedented levels. The CO2 module is designed to be power cycled when not in use. The sensor is designed to allow the user to wake up the unit from a dormant state and take a reading, and then power down it completely. This reduces the power consumption of the sensor to zero when dormant. The sensor is designed to be power cycled, where the sensor is only powered-up for the duration of the measurement, and then powered down again to save power for battery powered or wireless interface applications. The CozIR®-Blink also features a built-in autozero function that maintains CO2 measurement accuracy over the lifetime of the product. BLOCK DIAGRAM FEATURES • Ultra-low power CO2 sensor (60uW per reading, 60s, nPulse = 1) • 30ppm typical measurement accuracy • Solid state NDIR LED optical technology • UART or I2C control and data interface • Designed for power-cycling • 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 4.19, 10 May 2021 Page | 1 For regular updates, go to https://www.gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

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CozIR®-Blink Ultra-Low Power CO2 Sensor ORDERING INFORMATION COZIR-BLINK-X-X Notes: 1. Sensors are shipped individually or in trays 2. Tray quantity = 50 See separate data sheet for CozIR®-Blink evaluation kit options. Production Data, Revision 4.19, 10 May 2021 Page | 4 For regular updates, go to https://www.gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

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CozIR®-Blink Ultra-Low Power CO2 Sensor PACKAGE DRAWING – WITH PINS Bottom View Gas Sensing Solutions Ltd. Page | 5 For regular updates, go to https://www.gassensing.co.uk Production Data, Revision 4.19, 10 May 2021 Copyright © 2021 Gas Sensing Solutions Ltd

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CozIR®-Blink Ultra-Low Power CO2 Sensor VDD NAME TYPE GND Supply VDD Supply Rx_In Digital Input Tx_Out Digital Output NC VDD Unused VDD1 READY Digital Output NC Unused I2C_SDA NC Unused CozIR-Blink NC Unused No Pins I2C_SCL I2C_ENABLE Digital Input READY Digital Input I2C_ENABLE Digital Input/Output DESCRIPTION 4.7kΩ Sensor ground Sensor supply voltage Sensor Power Control UART Receive Input UART Transmit Output Do not connect Data ready pin. Pulsed high when data ready I2C MASTER Do not connect SDA Do not connect Do not connect SCL Set low for I2C interface mode. Leave floating to select UART...

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CozIR®-Blink Ultra-Low Power CO2 Sensor PACKAGE DRAWING – NO PINS Top View Gas Sensing Solutions Ltd. Page | 7 For regular updates, go to https://www.gassensing.co.uk Production Data, Revision 4.19, 10 May 2021 Copyright © 2021 Gas Sensing Solutions Ltd

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CozIR®-Blink Ultra-Low Power CO2 Sensor PIN-OUT DESCRIPTION – NO PINS PIN 1 2 3 4 5 6 7 8 TYPE Supply Supply Unused Supply Unused Digital Output Unused Digital Input Digital Input Tx_Out Rx_In Digital Input/Output Digital Output Digital Input DESCRIPTION Sensor ground Sensor supply voltage Do not connect (For internal use only) Sensor supply voltage Do not connect Data ready pin. Pulsed high when data ready Do not connect Set low for I2C interface mode. Leave floating to select UART interface mode. Pin status detected at power on. I2C serial clock input. Open drain, external 4.7kΩ resistor pulled...

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

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CozIR®-Blink Ultra-Low Power CO2 Sensor PERFORMANCE CHARACTERISTICS Test Conditions Unless Otherwise Specified VDD/VDD1 = 3.3V, GND = 0V. CO2 = 450ppm, RH = 0% non-condensing, T= 25°C, Pressure = 1013mbar, nPulse = 16 Production Data, Revision 4.19, 10 May 2021 Page | 10 For regular updates, go to https://www.gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

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CozIR®-Blink Ultra-Low Power CO2 Sensor POWER CONSUMPTION Test Conditions Unless Otherwise Specified VDD/VDD1 = 3.3V, GND = 0V. CO2 = 450ppm, RH = 0% non-condensing, T= 25°C, Pressure = 1013mbar SYMBOL TEST CONDITIONS OFF Active, SLEEP mode, no measurement The energy per reading is approximately 25mJ using default settings. Power consumption is strongly dependent on digital filter settings (# of pulses) and the measurement period. ްݟ. ϰݟӰݟ԰ݟаݟ Ӣȗ ݒϰݒְݒΰݒðݒưݒ Ӱݒаݒ ǰݒѰݒְݒͰݒ԰ݒưݒ ԰ݒѰݒưݒ ӰݒӰݒưݒ°ݒŰݒʰݒϰݒ Ȣȗ ݟϰݟΰݟΰݟ ΰݑ԰ݒưݒ°ݒ԰ݒְݒӰݒưݒΰݒưݒϰݒ հݒѰݒưݒӰݒʰݒаݒ Űݒʰݒ ϰݑڰݒưݒİݒаݒϰݒŰݒ In a typical application where...

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CozIR®-Blink Ultra-Low Power CO2 Sensor The graph below shows the trade-off between nPulse, the measurement period and the impact on average power consumption. Average Power Consumption Per Reading vs. nPulse Setting vs. Measurement Period ™ n=16 © n=8 © n=4 an n=2 ™ n=1 Production Data, Revision 4.19, 10 May 2021 Page | 12 For regular updates, go to https://www.gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

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