Preliminary Version (Software Version: V0.04SL-N2) Product Name: Super Low Power CO2 Sensor Module Item No.: CM1106SL-N Version: V0.3 Date: January 6, 2020

Super Low Power NDIR CO2 Sensor Module CM1106SL-N Applications ▪ HVAC industry ▪ Detecting units with battery operation ▪ Portable instruments Description CM1106SL-N is super low power consumption, high performance NDIR battery-powered CO2 sensor, which can be used to detect CO2 concentration of indoor air by adopting advanced non-dispersive infrared (NDIR) technology. It is ideally suited for HVAC industry, detecting units with battery operation, portable instruments, etc. ▪ NDIR technology with independent intellectual property ▪ Super low power consumption ▪ High accuracy, long-term stability,...

Specifications Note 1: Sensor is designed to measure in the range 0~5000ppm. Nevertheless, exposure to concentrations below 400ppm may result in incorrect operation of ABC algorithm and shall be avoided for model with ABC ON. Note 2: In normal IAQ applications, accuracy is defined with 10°C-35°C, 0-85%RH. ±(50ppm+5% of reading) could achieved under continuous power supply mode, with 4s as working cycle and moving average based on 24 data. Note 3: In normal IAQ applications, accuracy is defined with 10°C-35°C ,0-85%RH.When the sensor is under single measurement mode (controlled power supply by...

Application scene 1: UART TTL 2.8V serial port output ( Continuous Measurement Mode) Figure 2 Application scene 2: UART TTL 2.8V serial port output (Single Measurement Mode)

Description of Calibration CM1106SL-N support ABC function (Default is ABC closed), the user could open the ABC function by command in protocol. Auto Calibration: Rough installing, non-correct soldering and transportation might result in a reducing of sensor reading accuracy and zero drift, sensor will correct the drift by the built-in self-correcting logic. 1. Continuous Measurement Mode When the host sends command to activate working mode B, the sensor will enter continuous measurement mode. Powering on the sensor for 7 days (7 days by default) continuously, it will record the lowest CO2 concentration...

Blue Curve: light source work once in setting working intervals (T), every time work for 100ms. The Graph shows the average current of CM1106SL-N under single measurement mode (Working Mode A). Under this mode, the average working current is 30uA @ two minutes’ working interval. For more information, please contact Cubic.

Working Sequential Chart 1. Explanation of working sequential chart The working mode of CM1106SL-N is host-slave mode: CM1106SL-N is a slave and it begins to work after getting EN_VBB pin high level and getting power from the host. After powering on for 500ms, the sensor starts to work. After 500ms warm-up period, the light source flashes for 100ms, and then MCU of CM1106SL-N starts a calculation on measured CO2 concentration, and the calculation take 100ms, so in total one circle working time is 700ms. Then the host could communicate with CM1106SL-N when the RDY pin goes low level. After communication,...

When in continuous measurement mode, the sensor works at regular intervals (default setting 2 minutes). The host can read measurement after each measurement and does not need to send any command to trigger measurements. The host could set working intervals and set moving average to get better stability. 1. CM1106SL-N is with default single measurement mode (working mode A) . -Under this working mode, the working interval T = host setting working interval, the sensor works only one time during a working interval. There is no data moving average (the moving average data D=1). -If the host supply...

1. In order to ensure airflow diffusion into the sensor inner, make sure the minimum distance between the area of waterproof filter and the other components is 1.5 mm, otherwise, quick response time of the sensor will be effected. Reference as below: Waterproof Filter 2. To avoid the influence of stress on sensor, please soldering by hand as much as possible when mounting the sensor to the PCB. Reference as below: UART Communication Protocol (Version 1) www.gassensor.com.cn

1. CM1106SL-N only supports UART communication protocol. 2. To meet the requirements from more designers,CM1106SL-N is with two sets of UART communication protocol. Below information is one of the UART communication protocol (Protocol Version 1). If it is not suitable for designer to integrate, please contact [email protected] to request the other UART communication protocol. 3. Customized communication protocol is also available, for more details, please contact Cubic by [email protected]. 1. General Statement 1).The data in this protocol is all hexadecimal data. For example, “46” for...

4.1 Read Measured Result of CO2 Send: 11 01 01 ED Response: [ACK] 05 01 DF1- DF4 [CS] Function: Read measured result of CO2 (Unit: ppm) Note: CO2 measured result = DF1*256+DF2 DF3, DF4 is reserved Example: Response: 16 05 01 02 58 00 00 8B Explanation: Hex is converted to decimal: 02 is 02; 58 is 88 CO2 concentration =02*256+88 = 600ppm 4.2 Calibration of CO2 Concentration Send: 11 03 03 [DF0] [DF1] [CS] Response: [ACK] 01 03 [CS] Function: Calibration of CO2 concentration Note: 1. Calibration target value = DF1*256+DF2 Unit: PPM, range (400-1500ppm) 2. Before calibration, please make sure CO2...

Response: [ACK] 07 0F [DF1] [DF2] [DF3] [DF4] [DF5] [DF6] [CS] Function: Sensor ABC parameter check Example: Send:11 01 0F DF Response: 16 07 0F 64 02 07 01 90 64 72 4.4 Open/Close ABC and Set ABC Parameter Send: 11 07 10 [DF1][DF2][DF3][DF4][DF5][DF6][CS] Response: 16 01 10 D9 Function: Sensor ABC parameter set Explanation: DF1: reserved, default 100 (0x64) DF2: open/close auto calibration (0: open; 2: close, the default is close) DF3: calibration cycle (1-30 optional, 7days is default) DF4 and DF5: The high and low base line of calibration. (2 bytes) DF6: reserved, default is 100 (0x64) Note:...