iAQ-Core Indoor Air Quality Sensor Module General Description The iAQ-Core sensor module is used to measure VOC levels and provide CO 2 equivalent and TVOC equivalent predictions. The data is available via IC bus. The sensor itself is protected by a plastic cap and a filter membrane. The sensor module can be soldered directly to a host circuit board with selective or reflow soldering via the edge connectors. The sensor is protected by a membrane, which should not be removed. Note(s): Please read the IC addressing instructions carefully. An undefined use of the IC interface could harm the iAQ-Core module and cause a loss of functionality. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of iAQ-Core, Indoor Air Quality sensor module are listed below: Figure 1: Added Value of Using iAQ-Core Sensor Module Benefits Features * Reliable evaluation of indoor air quality * Output of relative CO2 equivalents (ppm) and TVOC equivalents (ppb) * High sensitivity and fast response * Sensing range: 450 - 2000 ppm CO2 equivalents 125 - 600 ppb TVOC equivalents * IC interface * Micro size for convenient installation * * * * * Low power consumption * 66 mW (maximum in continuous mode) * 9 mW (maximum in pulsed mode) MEMS metal oxide sensor technology SMD type package Reflow capable Module with automatic baseline correction Applications * Smart Home * Internet of Things * HVAC * Thermostats ams Datasheet [v1-00] 2015-Apr-30 Page 1 Document Feedback iAQ-Core - Pin Assignments Pin Assignments Figure 2: Pin Diagram Pin Diagram: iAQ-Core sensor module. 1 6 2 5 3 4 Figure 3: Pin Description Pin Number Pin Name Comment 1 NC Not connected 2 SCL IC serial clock 3 GND Ground 4 SDA IC serial data 5 NC Not connected 6 VCC +3.3V Page 2 Document Feedback ams Datasheet [v1-00] 2015-Apr-30 iAQ-Core - Electrical Characteristics Electrical Characteristics Figure 4: Power Supply Description Value Voltage 3.3V 0.1V, max. 20mV ripple Power consumption (continuous) Max. 66mW @ 3.3VDC (20mA) Measurement interval (continuous) 1s Power consumption (pulsed) Max. 9mW @ 3.3VDC (20mA) Measurement interval (pulsed) Max. 11s Note(s) and/or Footnote(s): 1. Decoupling capacitor included in design. Figure 5: Communication Description Value Output signal options IC First functional reading after start up 5 minutes Note(s) and/or Footnote(s): 1. For more communication details refer to IC Interface Description. ams Datasheet [v1-00] 2015-Apr-30 Page 3 Document Feedback iAQ-Core - Environmental Specifications Environmental Specifications Figure 6: Environmental Specifications Description Value Temperature range operation 0 to 50C Temperature range storage -25 to 50C Humidity range 5 to 95 % relative humidity, non-condensing Figure 7: Sensor Features Description Value Sensing technology MEMS metal oxide sensor Sensing range IC: 450 - 2000 ppm CO2 equivalents (relative) 125 - 600 ppb TVOC equivalents (relative) Values above the defined sensing range are provided as well. Module Automatic baseline correction Page 4 Document Feedback ams Datasheet [v1-00] 2015-Apr-30 iAQ-Core - Detailed Description Detailed Description IC Interface Description Physical Interface The physical interface is two-wire open drain SCL (clock) and SDA (data). Figure 8: Interface Description Description Value Pull-up resistors External pull-up resistor required Clock speed 100kHz Clock stretching Bus master clock stretching support is required Clock Stretching Clock stretching pauses a transaction by holding the clock line low. The transaction cannot continue until the line is released to high again. Although the module could send the bytes of data at a fast rate, it could happen that the module is busy at the request time. It can then hold the clock line low after reception and acknowledgement of a byte to force the master into a wait state until the iAQ-Core module is ready for the next byte transfer in a type of handshake procedure. (See official IC specification and user manual UM10204, http://www.nxp.com/documents/user_manual/UM10204.pdf ) Address Standard 7 bit IC address for iAQ-Core is decimal 90 or hexadecimal 0x5A. The addressing byte includes the read/write bit at the lowest significant bit. The communication with the iAQ-Core starts with 0xB5 for reading data. Note(s): Please avoid addressing the iAQ-Core with write bit. This could cause a loss of communication relevant information on modules side and the iAQ-Core is no longer contactable. Figure 9: Address Byte for the iAQ-Core Description Address R/W Bit 7 6 5 4 3 2 1 0 Data 1 0 1 1 0 1 0 1 ams Datasheet [v1-00] 2015-Apr-30 Page 5 Document Feedback iAQ-Core - Detailed Description Interface Protocol The standard IC specification is used for the iAQ-Core interface protocol. The IC master can request up to 9 bytes. These nine bytes include information about the indoor air quality value, the iAQ-Core status and the resistance of the sensor. If only the indoor air quality value and the status byte is required, the master should request three bytes from the iAQ-Core. All bytes are reported back as shown in the following table. A graphical description for a standard IC communication with the iAQ-Core module is shown in Figure 11 - Figure 14. Figure 10: iAQ-Core Interface Protocol Byte Name Data Type Typical Value 0-1 pred uint16 450 2 status uint8 0 3-6 resistance int32 256431 7-8 Tvoc uint16 125 Description Prediction (CO2 eq. ppm) 0x00: OK (data valid) 0x10: RUNIN (module in warm up phase) 0x01: BUSY (re-read multi byte data!) 0x80: ERROR (if constant: replace sensor) Sensor resistance [Ohm] Prediction (TVOC eq. ppb) Figure 11: Standard Communication via IC (Address Byte) Address Byte: The first byte is send by the master, containing address (0x5A) and read/write bit. The slave sends an acknowledgement (ACK) by pulling the data line to low. Page 6 Document Feedback ams Datasheet [v1-00] 2015-Apr-30 iAQ-Core - Detailed Description Figure 12: Standard Communication via IC (Prediction Value CO2) Prediction Value CO2: The slave will answer by sending bytes with MSB first. Byte0 and byte1 contain the prediction value. All bytes are acknowledged by the master. Figure 13: Standard Communication via IC (Status Byte) Status Byte: The third byte contains the information of the iAQ-Core module state, in this case status = 1. The master answers with acknowledge. ams Datasheet [v1-00] 2015-Apr-30 Page 7 Document Feedback iAQ-Core - Detailed Description Figure 14: Standard Communication via IC (Resistance Value) Resistance Value: The last four bytes contain the resistance value. For the calculation of the resistance only byte4, byte5 and byte6 are relevant, because byte3 is zero. After the last requested byte, the master sends a not acknowledge. Page 8 Document Feedback ams Datasheet [v1-00] 2015-Apr-30 iAQ-Core - Detailed Description Figure 15: Standard Communication via IC (Prediction Value TVOC) Prediction Value TVOC: The last two bytes contain the TVOC equivalence value. After the last requested byte, the master has to send a not acknowledge and the communication shall be ended with a STOP condition. ams Datasheet [v1-00] 2015-Apr-30 Page 9 Document Feedback iAQ-Core - Detailed Description Prediction Figure 16: Information Structure (Prediction) Byte0 Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8 The first two bytes contain the prediction value, which gives the information about the indoor air quality. The value is a CO2 (ppm) equivalent and the calculation is shown in the following example. (EQ1) Status Flag Figure 17: Information Structure (Status Flag) Byte0 Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8 The third byte indicates status of the module. * 0x00: OK * 0x01: BUSY * 0x80: ERROR If status is OK the data is valid. If the status is BUSY, the data integrity is not guaranteed for variables of size > 8 bits, because the module may be updating a part of the variable. If the status is ERROR constantly (or very frequently) this indicates that the module is reading non-realistic values, and the sensor element is probably defective. Resistance Figure 18: Information Structure (Resistance) Byte0 Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8 The next four bytes contain the sensor resistance in Ohm. Byte3 is always 0. (EQ2) Page 10 Document Feedback ams Datasheet [v1-00] 2015-Apr-30 iAQ-Core - Detailed Description TVOC Figure 19: Information Structure (TVOC) Byte0 Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8 The last two bytes contain the TVOC equivalent values, which gives the information about the relative indoor air quality. The value is given in TVOC (ppb) equivalent and the calculation is shown in the following example (EQ3) ams Datasheet [v1-00] 2015-Apr-30 tvoc eq = byte7 * 28 + byte8 Page 11 Document Feedback iAQ-Core - Application Information Application Information Handling Instructions The iAQ-Core module should be handled carefully, shear stress should be avoided. The sensor is protected by a membrane. This membrane should not be removed or touched. Soldering Instructions For soldering the iAQ-Core sensor module, standard reflow soldering ovens could be used. The reflow ovens shall be purged with clean air. Other gases must be avoided. For the lead free reflow process a standard process IPC/JEDEC J-STD-020 with peak temperature up to max 230C is suggested. See Figure 20 for more detailed description. Note(s): The device shall be kept clear of liquids; therefore a PCB washing process must be avoided in any case. For manual soldering, contact time must be limited to 5 seconds at a maximum temperature of 350C. Figure 20: Reflow Soldering Profile Reflow Soldering Profile: Ts min = 150C; Ts max = 200C; Ts Preheat = 60-120sec; TL < 220C for < 150sec; TP 230C for < 30sec; Ramp-up/down speed shall be < 5C/sec. Page 12 Document Feedback ams Datasheet [v1-00] 2015-Apr-30 iAQ-Core - Application Information Typical Application Figure 21: Simple Microcontroller Application VCC_________ 4k7 Microcontroller 4k7 SCL iAQ-core GND SDA Recommended Footprint Figure 22: Recommended Footprint (standard) 15.2 1.4 2.54 Keep out 2.54 Note(s) and/or Footnote(s): 1. Dimensions in mm. ams Datasheet [v1-00] 2015-Apr-30 Page 13 Document Feedback iAQ-Core - Mechanical Information Mechanical Information Figure 23: iAQ-Core Sensor Module 12.3 7.6 1 6 2 5 3 4 17.8 2.54 4.9 11.2 15.2 RoHS Green iAQ-Core Sensor Module: Dimensions in mm Page 14 Document Feedback ams Datasheet [v1-00] 2015-Apr-30 iAQ-Core - Mechanical Information Figure 24: iAQ-Core Marking Note(s) and/or Footnote(s): 1. Drawing not to scale. 2. All dimensions in mm. ams Datasheet [v1-00] 2015-Apr-30 Page 15 Document Feedback iAQ-Core - Mechanical Information Figure 25: Package Code XXXXX Tracecode Figure 26: Dimensions of iAQ-Core Sensor Module Description Value PCB 15.24 x 17.78 x 1.7 mm Dimensions (approximate values) CAP 11.2 x 17.78 x 2.6 mm TOTAL HEIGHT 4.3 mm Sensor position (approximate values) 7.6 x 12.3 mm Radius 3.5 mm Weight Approximately 1g IP-Class 00 (at proper installation) Connector Card edge (cut via) Page 16 Document Feedback ams Datasheet [v1-00] 2015-Apr-30 iAQ-Core - Ordering & Contact Information Ordering & Contact Information Figure 27: Ordering Information Ordering Code Marking Delivery Form Delivery Quantity Comment iAQ-Core C iAQ CORE C Tray 90 iAQ-Core (continuous operation mode) iAQ-Core P iAQ CORE P Tray 90 iAQ-Core (pulsed operation mode) Buy our products or get free samples online at: www.ams.com/ICdirect Technical Support is available at: www.ams.com/Technical-Support Provide feedback about this document at: www.ams.com/Document-Feedback For further information and requests, e-mail us at: ams_sales@ams.com For sales offices, distributors and representatives, please visit: www.ams.com/contact Headquarters ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten Austria, Europe Tel: +43 (0) 3136 500 0 Website: www.ams.com ams Datasheet [v1-00] 2015-Apr-30 Page 17 Document Feedback iAQ-Core - RoHS Compliant & ams Green Statement RoHS Compliant & ams Green Statement RoHS: The term RoHS compliant means that ams AG products fully comply with current RoHS directives. Our semiconductor products do not contain any chemicals for all 6 substance categories, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, RoHS compliant products are suitable for use in specified lead-free processes. ams Green (RoHS compliant and no Sb/Br): ams Green defines that in addition to RoHS compliance, our products are free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material). Important Information: The information provided in this statement represents ams AG knowledge and belief as of the date that it is provided. ams AG bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. ams AG has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ams AG and ams AG suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. Page 18 Document Feedback ams Datasheet [v1-00] 2015-Apr-30 iAQ-Core - Copyrights & Disclaimer Copyrights & Disclaimer Copyright ams AG, Tobelbader Strasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its General Terms of Trade. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein. ams AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by ams AG for each application. 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No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of technical or other services. ams Datasheet [v1-00] 2015-Apr-30 Page 19 Document Feedback iAQ-Core - Document Status Document Status Document Status Product Preview Preliminary Datasheet Datasheet Datasheet (discontinued) Page 20 Document Feedback Product Status Definition Pre-Development Information in this datasheet is based on product ideas in the planning phase of development. All specifications are design goals without any warranty and are subject to change without notice Pre-Production Information in this datasheet is based on products in the design, validation or qualification phase of development. The performance and parameters shown in this document are preliminary without any warranty and are subject to change without notice Production Information in this datasheet is based on products in ramp-up to full production or full production which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of Trade Discontinued Information in this datasheet is based on products which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of Trade, but these products have been superseded and should not be used for new designs ams Datasheet [v1-00] 2015-Apr-30 iAQ-Core - Revision Information Revision Information Changes from (2014-Oct) to current revision 1-00 (2015-Apr-30) Page Content of Applied Sensor datasheet was updated to the latest ams design Note(s) and/or Footnote(s): 1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision. 2. Correction of typographical errors is not explicitly mentioned. ams Datasheet [v1-00] 2015-Apr-30 Page 21 Document Feedback iAQ-Core - Content Guide Content Guide Page 22 Document Feedback 1 1 1 General Description Key Benefits & Features Applications 2 3 4 Pin Assignments Electrical Characteristics Environmental Specifications 5 5 5 5 5 6 10 10 10 11 Detailed Description IC Interface Description Physical Interface Clock Stretching Address Interface Protocol Prediction Status Flag Resistance TVOC 12 12 12 13 13 Application Information Handling Instructions Soldering Instructions Typical Application Recommended Footprint 14 15 16 17 18 19 Mechanical Information Ordering & Contact Information RoHS Compliant & ams Green Statement Copyrights & Disclaimer Document Status Revision Information ams Datasheet [v1-00] 2015-Apr-30