IAQ-CORE C Datasheet
Contents
1. MSb Byte 6 resistance LSb 1 0 ACK w UUU 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 ams Datasheet Document Feedback v1 00 2015 Apr 30 iAQ Core Detailed Description Figure 15 Standard Communication via PC Prediction Value TVOC MSb Byte 7 tvoc eq LSb 7 6 5 4 3 2 1 o ACK e IUUUUUUUUL DATA 7 6 5 4 3 2 i 0 ACK MSb Byte 8 tvoc eq LSb 7 6 5 4 3 2 1 ACK a JUUUUUUUUL DATA 7 6 5 4 3 2 i 0 ACK 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 Page 9 v1 00 2015 Apr 30 Document Feedback ami iAQ Core Detailed Description Prediction Figure 16 Information Structure Prediction ByteO 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 Prediction byte0 2 byte1 Status Flag Figure 17 Information Structure Status Flag2. ByteO Byte 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 gt 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 ByteO Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8 The next four bytes contain the sensor resistance in Ohm Byte3 is always 0 EQ2 Resistance byte4 216 byte5 2 byte6 Page 10 ams Datasheet Document Feedback v1 00 2015 Apr 30 iAQ Core Detailed Description TVOC Figure 19 Information Structure TVOC Byte Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8 EQ3 ams Datasheet v1 00 2015 Apr 30 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 tvoc eq byte7 2 byte8 Page 11 Document Feedback am Application Information Figure 20 Reflow Soldering Profile iAQ Core ApplicationInformation Handling Instructions The iAQ Core mo
3. ams Datasheet Page 21 v1 00 2015 Apr 30 Document Feedback am Content Guide Page 22 Document Feedback 12 12 12 13 13 14 15 16 17 18 19 iAQ Core Content Guide General Description Key Benefits amp Features Applications Pin Assignments Electrical Characteristics Environmental Specifications Detailed Description FC Interface Description Physical Interface Clock Stretching Address Interface Protocol Prediction Status Flag Resistance TVOC Application Information Handling Instructions Soldering Instructions Typical Application Recommended Footprint Mechanical Information Ordering amp Contact Information RoHS Compliant amp ams Green Statement Copyrights amp Disclaimer Document Status Revision Information ams Datasheet v1 00 2015 Apr 30
4. OK data valid 2 status ume o a 0x80 ERROR if constant replace sensor 3 6 resistance int32 256431 Sensor resistance Ohm 7 8 Tvoc uint16 125 Prediction TVOC eq ppb Figure 11 Standard Communication via I C Address Byte a A AARAAAARA 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 ams Datasheet Document Feedback v1 00 2015 Apr 30 iAQ Core Detailed Description Figure 12 Standard Communication via PC Prediction Value CO MSb Byte 0 prediction LSb 7 6 5 4 3 2 ACK ia IUUUUUUUUL DATA 7 6 5 4 3 2 1 0 ACK MSb Byte 1 prediction LSb 7 6 5 4 3 2 1 0 ACK x JUUUUUUUY DATA 7 6 5 4 3 2 i 0 ACK Prediction Value CO gt The slave will answer by sending bytes with MSB first ByteO and byte1 contain the prediction value All bytes are acknowledged by the master Figure 13 Standard Communication via I2C Status Byte MAAR 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 Page 7 v1 00 2015 Apr 30 Document Feedback iAQ Core Detailed Description am Figure 14 Standard Communication via I C Resistance Value MSb Byte 3 resistance LSb a IULIU UL M Byte 5 resistance LSb UV
5. www nxp com documents user_manual UM10204 pdf Address Standard 7 bit I C address for iAQ Core is decimal 90 or hexadecimal Ox5A 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 Page 5 v1 00 2015 Apr 30 Document Feedback iAQ Core Detailed Description am Interface Protocol The standard IC specification is used for the iAQ Core interface protocol The I C 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 I C 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 Description 0 1 pred uint16 450 Prediction CO2 eq ppm 0x00
6. 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 Page 17 v1 00 2015 Apr 30 Document Feedback am RoHS Compliant amp ams Green Statement Page 18 Document Feedback iAQ Core RoHSCompliant amp amsGreen 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 h
7. General Description Figure 1 am 1AQ Core Indoor Air Quality Sensor Module The iAQ Core sensor module is used to measure VOC levels and provide CO equivalent and TVOC equivalent predictions The data is available via I C 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 I C 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 amp Features The benefits and features of iAQ Core Indoor Air Quality sensor module are listed below Added Value of Using iAQ Core Sensor Module Benefits Features Reliable evaluation of indoor air quality Output of relative CO equivalents ppm and TVOC equivalents ppb e High sensitivity and fast response Sensing range 450 2000 ppm CO equivalents 125 600 ppb TVOC equivalents PC interface Micro size for convenient installation MEMS metal oxide sensor technology SMD type package Reflow capable Module with automatic baseline correction Low power consumption 66 mW maximum in continuous mode 9 mW maximum in pulsed mode am
8. 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 This product is provided by ams AG AS IS and any express or implied warranties including but not limited to the implied warranties of merchantability and fitness for a particular purpose are disclaimed ams AG shall not be liable to recipient or any third party for any damages including but not limited to personalinjury property damage loss of profits loss of use interruption of business or indirect special incidental or consequential damages of any kind in connection with or arising out of the furnishing performance or use of the technical data herein 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 Page 19 v1 00 2015 Apr 30 Document Feedback iAQ Core DocumentStatus am Document Status Document Status Product Status Definition Information in this datasheet is based on product ideas in the planning phase of development All s
9. cument Feedback ami Mechanical Information Figure 23 iAQ Core Sensor Module iAQ Core Mechanicallnformation 7 6 12 3 2 54 4 9 17 8 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 BAs D XXXXX a i I eS LAS l A AQ CORE Pl XX XXX Sa i I Note s and or Footnote s 1 Drawing not to scale 2 All dimensions in mm ams Datasheet Page 15 v1 00 2015 Apr 30 Document Feedback iAQ Core MechanicalInformation Figure 25 Package Code Tracecode Figure 26 Dimensions of iAQ Core Sensor Module Description Value PCB 15 24 x 17 78 x 1 7mm Dimensions approximate values CAP 11 2 x 17 78 x 2 6 mm TOTAL HEIGHT 4 3 mm 7 6 x 12 3 mm Sensor position approximate values Radius 3 5 mm Weight Approximately 1g IP Class 00 at proper installation Connector Card edge cut via Page 16 ams Datasheet Document Feedback v1 00 2015 Apr 30 iAQ Core Ordering amp Contact Information Ordering amp Contact Information Figure 27 Ordering Information Delivery Delivery Ordering Code Marking Form Quantity Comment iAQ Core
10. dule should be handled carefully shear stress should be avoided The sensor is protected by amembrane 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 230 C 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 350 C Temperature 125 C to Peak Critical Zone T t Te Reflow Soldering Profile Ts min 150 C Ts max 200 C Ts Preheat 60 120sec TL lt 220 C for lt 150sec TP lt 230 C for lt 30sec Ramp up down speed shall be lt 5 C sec Page 12 Document Feedback ams Datasheet v1 00 2015 Apr 30 iAQ Core Application Information Typical Application Figure 21 Simple Microcontroller Application VCC Microcontroller iAQ core WE Recommended Footprint Figure 22 Recommended Footprint standard 15 2 2 54 1 4 i Keep out 2 54 Note s and or Footnote s 1 Dimensions in mm ams Datasheet Page 13 v1 00 2015 Apr 30 Do
11. omogeneous 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 ams Datasheet v1 00 2015 Apr 30 iAQ Core Copyrights amp Disclaimer am Copyrights amp 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
12. pecifications are design goals without any warranty and are subject to change without notice Product Preview Pre Development Information in this datasheet is based on products in the design validation or qualification phase of development Preliminary Datasheet Pre Production The performance and parameters shown in this document are preliminary without any warranty and are subject to change without notice Information in this datasheet is based on products in ramp up to full production or full production which Datasheet Production conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of Trade Information in this datasheet is based on products which conform to specifications in accordance with the terms of Datasheet discontinued Discontinued 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 Page 20 ams Datasheet Document Feedback v1 00 2015 Apr 30 iAQ Core Revision Information Revision Information Changes from 2014 Oct to current revision 1 00 2015 Apr 30 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
13. peration 0 to 50 C Temperature range storage 25 to 50 C Humidity range 5 to 95 relative humidity non condensing Figure 7 Sensor Features Description Value Sensing technology MEMS metal oxide sensor PC 450 2000 ppm CO2 equivalents relative Sensing range 125 600 ppb TVOC equivalents relative Values above the defined sensing range are provided as well Module Automatic baseline correction Page 4 ams Datasheet Document Feedback v1 00 2015 Apr 30 iAQ Core Detailed Description Detailed Description I C 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
14. s Datasheet v1 00 2015 Apr 30 Applications Smart Home Internet of Things e HVAC Thermostats Page 1 Document Feedback iAQ Core Pin Assignments am Pin Assignments Figure 2 Pin Diagram Pin Diagram iAQ Core sensor module Figure 3 Pin Description Pin Number Pin Name Comment 1 NC Not connected 2 SCL PC serial clock 3 GND Ground 4 SDA PC serial data 5 NC Not connected 6 VCC 3 3V Page 2 ams Datasheet Document Feedback 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 PC First functional reading after start up 5 minutes Note s and or Footnote s 1 For more communication details refer to I C Interface Description ams Datasheet Page 3 v1 00 2015 Apr 30 Document Feedback am Environmental Specifications iAQ Core EnvironmentalSpecifications Figure 6 Environmental Specifications Description Value Temperature range o
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