User Manual EE895
Miniature Sensor Module for CO2, Temperature and Barometric Pressure | 2
Content
1 General Information...................................................................................................................................... 3
1.1 Explanation of Warning Notices and Symbols ....................................................................................... 3
1.2 Safety Instructions ................................................................................................................................ 4
1.2.1. General Safety Instructions ......................................................................................................................... 4
1.2.2. Intended Use............................................................................................................................................... 4
1.2.3. Mounting, Start-up and Operation................................................................................................................ 4
1.3 Environmental Aspects.......................................................................................................................... 5
1.4 ESD Protection .................................................................................................................................... 5
1.5 Product Description............................................................................................................................... 5
1.6 Operating Principle CO2Measurement ................................................................................................. 5
2 Handling Instructions................................................................................................................................... 6
3 Hardware ....................................................................................................................................................... 6
3.1 Dimensions ........................................................................................................................................... 6
3.2 Mounting Recommendation .................................................................................................................. 7
3.2.1. Mounting via Solder Pads............................................................................................................................ 7
3.2.2. Mounting via Side Plated Contacts .............................................................................................................. 7
3.3 EE895 Block Diagram ........................................................................................................................... 8
3.5 Pin Description...................................................................................................................................... 9
3.6 Electrical Characteristics..................................................................................................................... 11
3.7 Typical Applications............................................................................................................................. 12
3.7.1. EE895 Connected to USB Interface........................................................................................................... 12
3.7.2. EE895 in Battery Powered Devices ........................................................................................................... 12
3.7.3. EE895 Connected to a KNX Bus ............................................................................................................... 13
4 Digital Interface........................................................................................................................................... 13
4.1 I2C Interface........................................................................................................................................ 13
4.1.1. Modbus Protocol Over I2C Interface .......................................................................................................... 13
4.1.2. I2C Simplified Protocol............................................................................................................................... 14
4.2 UART Interface ................................................................................................................................... 16
4.2.1. Modbus Protocol Over UART Interface...................................................................................................... 16
4.3 Modbus Register Map ......................................................................................................................... 17
4.4 General Purpose Registers for Individiual Use.................................................................................... 17
4.5 EE895 Commands .............................................................................................................................. 18
4.5.1. Information ................................................................................................................................................ 18
4.5.2. General Settings........................................................................................................................................ 18
4.5.3. CO2Parameter Settings ............................................................................................................................ 20
5 Technical Data ............................................................................................................................................ 21
