Datasheet PM2105L (Cubic) - 10

User Attention
▪The best instal ation way is to make the surface of air inlet and outlet of the sensor clings to the air vent in the inner wal of the user device that communicates with the outside. If it’s not possible, then an air isolation structure between air inlet and air outlet is necessary to avoid the air back flow in the user’s device. ▪Air vent size on the internal wal of user’s device for airflow should be bigger than the size of air inlet of the sensor. ▪For purification products, sensor cannot be instal ed in the purifying air duct. If it’s not possible, it’s necessary to design a separate structure for sensor instal ation to isolate the sensor from air purifier duct. ▪For purifier and detector device, sensor should be instal ed above 20cm higher than floor to avoid contamination of large dust particles or even flocs near the ground entering the sensor, which wil influence the measurement. ▪Sensor should be prohibited from using for outdoor inspection equipment. Dust storms, rain, snow, and wil ow flocs can have a significant impact on unprotected sensors. ▪It is for household electronics products. For application of medical, mining, disaster preparedness, which needs high security and high dependence, this sensor is not suitable. ▪Avoid using the sensor under the condition with strong magnetic, such as situation close to stereo speaker, microwave oven, induction cooking. ▪There is no high pressure transient protection circuit of the sensor. The power supply of the sensor should be stable and low noise. Please refer to the working voltage in specification table. ▪The sensor needs 5V power supply because the fan needs a 5V power to drive. But al other data communication and control pins require 3.3V as a high level. Therefore, the main board MCU communication with the sensor should be the 3.3V communication level. If the main board MCU is 5V communication level, then it need to connect 5V to 3.3V level conversion chips or circuits outside the communication port (RX, TX) and control port (RET,RESET). ▪If isolated switch power supply is adopted to obtain DC power, please control the capacitance between the DC ground and the AC ground below 2.2nF and withstand voltage reaches to 3KV. This product is defined as 3R laser product according to 《GB7247.1-2012 laser product safety》 with laser radiation inside. Please avoid direct exposure to your eyes. Warning sign is as shown above. www.en.gassensor.com.cn 9/19 Document Outline Description Features Working Principle Specifications Dimensions and Connector 1.Dimensions (Unit mm, tolerance ±0.2 mm) Typical Application Circuit Case 1.UART3.3V Application Product Installation User Attention UART Communication Protocol 1. General Statement 2.Format of Serial Communication Protocol 3.Command Table of Serial Protocol Note: Example: 4.3 Set up and Read Particle Calibrated Coefficien Note: Description: 4.4 Close/Open Laser Diode Note: Note: Example: Note: Example: I²C Communication Protocol 1. Brief Introduction 2. Communication Common Description 3. Protocol Detailed Description 3.1Send Command Data 3.2Read Command Data Packing Information