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iAQ-Core
Indoor Air Quality Sensor Module
General Description
The iAQ-Core sensor module is used to measure VOC levels and
provide CO2 equivalent and TVOC equivalent predictions. The
data is available via I²C 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 I²C addressing instructions carefully.
An undefined use of the I²C 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
• Reliable evaluation of indoor air
quality
• High sensitivity and fast response
• Micro size for convenient installation
• Low power consumption
Features
• Output of relative CO2 equivalents (ppm) and TVOC
equivalents (ppb)
• Sensing range: 450 – 2000 ppm CO2 equivalents
125 – 600 ppb TVOC equivalents
• I²C interface
• MEMS metal oxide sensor technology
• SMD type package
• Reflow capable
• Module with automatic baseline correction
• 66 mW (maximum in continuous mode)
• 9 mW (maximum in pulsed mode)
Applications
• Smart Home
• Internet of Things
• HVAC
• Thermostats
ams Datasheet
[v1-00] 2015-Apr-30
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Pin Assignments
Pin Diagram: iAQ-Core sensor
module.
Figure 2:
Pin Diagram
iAQ-Core − Pin Assignments
16
25
34
Figure 3:
Pin Description
Pin Number
1
2
3
4
5
6
Pin Name
NC
SCL
GND
SDA
NC
VCC
Comment
Not connected
I²C serial clock
Ground
I²C serial data
Not connected
+3.3V
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iAQ-Core − Electrical Characteristics
Electrical Characteristics
Figure 4:
Power Supply
Description
Voltage
Power consumption (continuous)
Measurement interval (continuous)
Power consumption (pulsed)
Measurement interval (pulsed)
Value
3.3V ± 0.1V, max. 20mV ripple
Max. 66mW @ 3.3VDC (20mA)
1s
Max. 9mW @ 3.3VDC (20mA)
Max. 11s
Note(s) and/or Footnote(s):
1. Decoupling capacitor included in design.
Figure 5:
Communication
Description
Output signal options
First functional reading after start up
I²C
5 minutes
Value
Note(s) and/or Footnote(s):
1. For more communication details refer to I²C Interface Description.
ams Datasheet
[v1-00] 2015-Apr-30
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Environmental Specifications
Figure 6:
Environmental Specifications
Description
Temperature range operation
Temperature range storage
Humidity range
Figure 7:
Sensor Features
Description
Sensing technology
Sensing range
Module
iAQ-Core− EnvironmentalSpecifications
Value
0 to 50°C
-25 to 50°C
5 to 95 % relative humidity, non-condensing
Value
MEMS metal oxide sensor
I²C: 450 – 2000 ppm CO2 equivalents (relative)
125 – 600 ppb TVOC equivalents (relative)
Values above the defined sensing range are provided as well.
Automatic baseline correction
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iAQ-Core − Detailed Description
Detailed Description
Figure 8:
Interface Description
Description
Pull-up resistors
Clock speed
Clock stretching
Figure 9:
Address Byte for the iAQ-Core
Description
Bit
Data
7
1
6
0
I²C Interface Description
Physical Interface
The physical interface is two-wire open drain SCL (clock) and
SDA (data).
Value
External pull-up resistor required
100kHz
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 I²C
specification and user manual UM10204,
http://www.nxp.com/documents/user_manual/UM10204.pdf )
Address
Standard 7 bit I²C 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.
Address
R/W
543210
110101
ams Datasheet
[v1-00] 2015-Apr-30
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