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User Manual

Miniature Sensor Module for CO

2

,

Temperature and Barometric Pressure

EE895

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Summary of Contents for EE895

Page 1: ...User Manual Miniature Sensor Module for CO2 Temperature and Barometric Pressure EE895...

Page 2: ...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 Conne...

Page 3: ...NOTE Find this document and further product information on our website at www epluse com ee895 1 1 Explanation of Warning Notices and Symbols Safety precautions Precautionary statements warn of hazar...

Page 4: ...tion or failure could cause injury to human beings NOTICE Failing to follow the instructions in this user manual may lead to measurement inaccuracy and device failures The EE895 may only be operated u...

Page 5: ...t be separated according to local recycling regulations The electronics shall be disposed of correctly as electronics waste 1 4 ESD Protection The sensing elements and the electronics board are ESD el...

Page 6: ...the instructions in this user manual may lead to measurement inaccuracy and device failures The EE895 housing and the circuit board shall not be exposed to unneccessary mechanical stress during instal...

Page 7: ...he EE895 module can be mounted onto a pluggable female header or directly onto the electronics board by using a pin header with 2 54 mm 0 1 inch pitch The minimum clearance of 2 mm 0 08 inch shall be...

Page 8: ...ter infra red lamp IR L 2 VCC_IO Power supply Power supply for the microcontroller 3 EN Input Enable the module Tie to Vcc_IO for normal operation 4 GND Power supply Ground1 5 GND Power supply Ground1...

Page 9: ...s of the EN pin by an external host controller When the EN pin is pulled down to the logic Low 0 0 4 V the internal voltage regulator of EE895 is switched off and the current consumption is typically...

Page 10: ...on the interface selected with pin 7 ISEL Pin 7 ISEL connected to ground EE895 features I2 C interface Pin no Mode Comment 8 SCL serial clock External pull up resistor to V bus high voltage level is r...

Page 11: ...nd maximum current values in each individual state during the sampling interval which is shown in the current profile in Fig 8 Power Supply VCC_IO VCC_EM Status 3 3 V 5 V Idle measurement 6 2 9 9 mA 0...

Page 12: ...ltage regulator The host can read the values at any time pin 6 RDY is not used 3 7 2 EE895 in Battery Powered Devices Fig 10 Example battery powerd devices Pin 7 ISEL is connected to the ground the EE...

Page 13: ...described in detail in the Modbus Application Note AN0103 available at www epluse com ee895 4 1 I2 C Interface The EE895 supports the standard I2 C specification For detailed information about the I2...

Page 14: ...value Lo CRC Stop S BF 03 04 00 00 41 DC 74 3F P For decoding of float values stored according standard IEEE 754 please refer also to the Modbus Application Note AN0103 Example of Decoding Modbus res...

Page 15: ...130 means 1 013 mbar Tab 7 Data availability from the EE895 Miniature Sensor Module Example for reading all measurands 7 bit address shifted EE895 Request Hex S BC 00 P Start Slave address 7 bit shif...

Page 16: ...e p 0x2670 9840 984 0 mbar Tab 9 Interpretation of data from the response 4 2 UART Interface 4 2 1 Modbus Protocol Over UART Interface Modbus slave address 0x5F The interface settings are Baud rate 96...

Page 17: ...Register number1 DEC Protocol address2 HEX Read register function code 0x03 Temperature T C 100 4002 0xFA1 Temperature T F 50 4003 0xFA2 Temperature T K 50 4005 0xFA4 CO2 average pc4 ppm 1 4031 0xFBE...

Page 18: ...s 0 terminated 1 Register address starts from 0 Tab 13 Available commands for I2 C and UART PLEASE NOTE When reading the serial number or the sensor name it is always necessary to read all 8 registers...

Page 19: ...ble Measuring trigger command for the single shot measurement For accurate measurement results there are recommended six single shot measurements under stable temperature conditions Function code Regi...

Page 20: ...fault 4 0x1452 CO2 customer offset ppm 16 bit integer signed Range 32 786 32 785 Default 0 ppm 1 Register address starts from 0 Tab 18 CO2 parameter settings The EE895 features an exponential moving a...

Page 21: ...Residual pressure dependency2 typ 0 014 of the measured value mbar ref to 1 013 mbar Initialisation time power on 1 s Response time t63 140 s with measured data averaging smooth output 75 s without m...

Page 22: ...ltage 3 3 5 V DC 5 Average current consumption typ for supply voltage 5 V 1 6 mA at 15 s sampling interval 196 A at 1 h sampling interval with standby between measurements 8 A at 1h sampling interval...

Page 23: ...ance SARL T 33 4 74 72 35 82 info fr epluse com E E Elektronik Deutschland GmbH T 49 6171 69411 0 info de epluse com E E Elektronik India Private Limited T 91 990 440 5400 info in epluse com E E Elekt...

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