IAQ-CORE Datasheet, PDF (6/22 Pages) ams AG – The iAQ-Core sensor module is used to measure VOC levels

iAQ-Core − DetailedDescription
Figure 10:
iAQ-Core Interface Protocol
Interface Protocol
The standard I²C specification is used for the iAQ-Core interface
protocol. The I²C 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 I²C communication with the iAQ-Core
module is shown in Figure 11 – Figure 14.
Byte
0-1
Name
pred
Data Type
uint16
2
status
uint8
3-6 resistance
7-8
Tvoc
int32
uint16
Typical Value
450
0
256431
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 I²C (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.
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ams Datasheet
[v1-00] 2015-Apr-30