www.sensirion.com Version 1.1 – March 2019 1/18
Datasheet SVM30
Multi-gas, humidity and temperature sensor combo module
▪ Measures indoor air quality parameters total VOC (tVOC),
CO2-equivalent (CO2eq), relative humidity RH and
temperature T
▪ Automatic baseline compensation and humidity
compensation of MOX gas sensor
▪ Outstanding long-term stability and reliability
▪ Fully factory calibrated and tested
▪ Digital I2C interface
▪ 5V supply voltage
▪ Dimensions: 39 x 15 x 6.5 mm
Product Summary
The SVM30 is a Multi-gas, humidity and temperature sensor combo module containing an SGP30 gas sensor
as well as an SHTC1 humidity and temperature sensor.
The SGP30 gas sensor on the SVM30 combines multiple metal-oxide sensing elements − the pixels – on one
chip, thereby offering the possibility to measure a total VOC signal (tVOC) and a CO2 equivalent signal (CO2eq)
with one single sensor-chip. The SVM30 further offers calibrated air quality output signals as well as
compensation of humidity cross-sensitivity. The sensing element features an unmatched robustness against
contamination by siloxanes present in real-world applications enabling a unique long-term stability and low drift.
The humidity and temperature sensor on SVM30 covers a humidity measurement range of 0 to 100 %RH and
a temperature measurement range of –20 to 85 °C with a typical accuracy of ±5 %RH and ±1°C.
The gas and RH/T sensor components are designed with Sensirion’s CMOSens® technology. This technology
offers a complete sensor system on a single chip, including the sensing elements, analog and digital signal
processing, A/D converter, calibration and data memory and a digital communication interface supporting I2C
standard mode. Sensirion’s state-of-the-art production process, including full calibration and testing of the
sensors, guarantees high reproducibility and reliability.
RH sensor
T sensor
Calibration
memory
Linearization,
Temperature compensation,
Data processing
I2C interface / ESD protection / Power supply conversion
tVOC, CO2eq, RH, T
output
GND
VDD
SVM30
Calibration
memory
Linearization, Baseline
compensation, Humidity
compensation, Data processing
Multi-pixel MOX gas sensor
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Content
1 Gas, humidity and temperature sensor specification 3
1.1 Gas sensing performance 3
1.2 Air Quality Signals 4
1.3 Relative humidity 5
1.4 Temperature 5
1.5 Recommended operating conditions 5
2 Electrical specification 6
2.1 Electrical characteristics 6
2.2 Absolute maximum ratings 6
3 Timing specification 6
3.1 Sensor system timing 6
4 Mechanical specification 7
4.1 Sensor dimensions and mechanical design 7
4.2 Connector specification and pin assignment 7
5 Interface specification 8
6 Operation 9
6.1 Power-Up and Communication Start 9
6.2 Measurement Communication Sequence 9
6.3 Measurement Commands 11
6.4 Soft Reset 13
6.5 Get Serial ID 13
6.6 Checksum Calculation 14
6.7 Conversion of the sensor output for RH and T 14
7 Application description 15
7.1 Typical application diagram 15
7.2 Mounting recommendations 15
8 Quality 16
9 Ordering Information 16
10 Important notices 17
10.1 Warning, personal injury 17
10.2 ESD precautions 17
10.3 Warranty 17
11 Revision history 18
12 Headquarters and subsidiaries 18
www.sensirion.com Version 1.1 – March 2019 3/18
1 Gas, humidity and temperature sensor specification
1.1 Gas sensing performance
The values listed in Table 1 are valid at 25°C, 50% RH and typical VDD.
Parameter
Signal
Values
Comments
Measurement
range1
Ethanol signal
0 ppm to 1000 ppm
H2 signal
0 ppm to 1000 ppm
Specified
measurement
range
Ethanol signal
0.3 ppm to 30 ppm
The specifications below are defined for this measurement
range2. The specified measurement range covers the gas
concentrations expected in indoor air quality applications.
H2 signal
0.5 ppm to 3 ppm
Accuracy3,4
Ethanol signal
see Figure 1
typ.: 15% of meas. value
Accuracy of the concentration c
determined by
a = 512
sout: EthOH/H2 signal output
at concentration c
sref: EthOH/H2 signal output
at 0.5 ppm H2
cref = 0.4 ppm
H2 signal
see Figure 2
typ.: 10% of meas. value
cref = 0.5 ppm
Sensitivity
Ethanol signal
-1.0
Sensitivity n is defined by
The typical numerical value of n is n = -1 for both, the
Ethanol and H2 signal. The sensitivity is understood as an
average value over the specified measurement range as
determined by a least square fit.
H2 signal
-1.0
Sensitivity
tolerance3
Ethanol signal
typ. tolerance: ±7% rel. error
max. tolerance: ±14% rel. error
H2 signal
typ. tolerance: ±7% rel. error
max. tolerance: ±14% rel. error
Long-term drift3, 5
Ethanol signal
see Figure 3
typ.: 1.3% of meas. value
Change of accuracy over time: Siloxane accelerated
lifetime test6
H2 signal
see Figure 4
typ.: 1.3% of meas. value
Resolution
Ethanol signal
0.2 % of meas. value
Resolution of Ethanol and H2 signal outputs in relative
change of the measured concentration
H2 signal
Sampling
frequency
Ethanol signal
Max. 40 Hz
Compare with minimum measurement duration in Table 13
H2 signal
Table 1 Gas sensing performance.
1
Exposure to ethanol and H2 concentrations up to 1000 ppm have been tested. For applications requiring the measurement of higher gas concentrations please
contact Sensirion.
2
ppm: parts per million. 1 ppm = 1000 ppb (parts per billion)
3
90% of the sensors will be within the typical accuracy tolerance, >99% are within the maximum tolerance.
4
Valid at an air flow of > 1m/s.
5
The long-term drift is stated as change of accuracy per year of operation.
6
Test conditions: operation in 250 ppm Decamethylcyclopentasiloxane (D5) for 200h simulating 10 years of operation in an indoor environment.
www.sensirion.com Version 1.1 – March 2019 4/18
Accuracy ethanol signal
Figure 1 Typical and maximum accuracy tolerance in % of measured
value at 25°C, 50% RH and typical VDD. The sensors have been
operated for at least 24h before the characterization.
Accuracy H2 signal
Figure 2 Typical and maximum accuracy tolerance in % of measured
value at 25°C, 50% RH and typical VDD. The sensors have been
operated for at least 60h before the characterization.
Long-term drift Ethanol signal
Figure 3 Typical and maximum long-term drift in % of measured value
at 25°C, 50% RH and typical VDD. The sensors have been operated for
at least 24h before the first characterization.
Long-term drift H2 signal
Figure 4 Typical and maximum long-term drift in % of measured value
at 25°C, 50% RH and typical VDD. The sensors have been operated
for at least 60h before the first characterization.
1.2 Air Quality Signals
Parameter
Signal
Value
Comments
Output range
TVOC signal
0 ppb to 60000 ppb
Maximum possible output range. The gas
sensing performance is specified for the
measurement range as defined in Table 1
CO2eq signal
400 ppm to 60000 ppm
Resolution
TVOC signal
0 ppb - 2008 ppb
1 ppb
2008 ppb – 11110 ppb
6 ppb
11110 ppb – 60000 ppb
32 ppb
CO2eq signal
400 ppm – 1479 ppm
1 ppm
1479 ppm – 5144 ppm
3 ppm
5144 ppm – 17597 ppm
9 ppm
17597 ppm – 60000 ppm
31 ppm
Sampling rate
TVOC signal
1 Hz
The on-chip baseline compensation algorithm
has been optimized for this sampling rate. The
sensor shows best performance when used
with this sampling rate.
CO2eq signal
1 Hz
Table 2 Air quality signal specification
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Figure 5 Simplified version of the functional block diagram showing the signal paths of the gas sensor SGP30.
1.3 Relative humidity
Parameter
Conditions
Value
Units
Accuracy tolerance7
In range of 25 ... 75 %RH and 5 ... 55 °C
5.0
%RH
Repeatability8
-
0.1
%RH
Resolution9
-
0.01
%RH
Hysteresis
-
1
%RH
Operating range
non-condensing environment10
0 ... 100
%RH
Response time11
63%
8
s
Long-term drift12
Typ.
<0.25
%RH/y
Table 3: Humidity sensor specification
1.4 Temperature
Parameter
Conditions
Value
Units
Accuracy tolerance7
In range of 5 ... 55 °C
1
°C
Repeatability8
-
0.1
°C
Resolution9
-
0.01
°C
Operating range
-
–20 ... +85
°C
Long-term drift 13
Typ.
<0.02
°C/y
Table 4: Temperature sensor specification
1.5 Recommended operating conditions
The sensors show best performance when operated within recommended normal temperature range of 5...55°C
and absolute humidity range of 4...20 g/m3. Long-term exposure (operated and not operated) to conditions
outside the recommended range, especially at high humidity, may affect the sensor performance. Prolonged
exposure to extreme conditions may accelerate aging. Furthermore, it may temporarily offset the RH signal (e.g.
+3%RH after 60h at >80%RH). After returning into the normal temperature and humidity range the RH-sensor
will slowly come back to calibration state by itself. To ensure stable operation of the gas sensor, the conditions
described in the document SGP Handling and Assembly Instructions as well as the Infosheet Handling
7
Typical accuracy tolerance according to the document “Sensirion Humidity Sensor Specification Statement”. Valid for an air flow of > 1 m/s.
8
The stated repeatability is 3 times the standard deviation (3σ) of multiple consecutive measurement values at constant conditions and is a measure for the noise
on the physical sensor output.
9
Resolution of A/D converter.
10
Condensation shall be avoided because of risk of corrosion and leak currents on the PCB.
11
Time for achieving 63% of a humidity step function, valid at 25°C and 1 m/s airflow. Humidity response time in the application depends on the design-in of the
sensor.
12
Typical value for operation in normal RH/T operating range. Max. value is < 0.5 %RH/y. Value may be higher in environments with vaporized solvents, out-gassing
tapes, adhesives, packaging materials, etc. For more details, please refer to Handling Instructions.
13
Max. value is < 0.04°C/y.
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Instructions Humidity Sensors regarding exposure to exceptionally high concentrations of some organic or
inorganic compounds have to be met, particularly during operation.
2 Electrical specification
2.1 Electrical characteristics
Default conditions of 25 °C and 5 V supply voltage apply to values in the table below, unless otherwise stated.
Parameter
Symbol
Conditions
Min
Typ.
Max
Units
Comments
Supply voltage
VDD
4.5
5
5.5
V
-
Supply current14
IDD
Average
-
49
mA
-
Low level input voltage
VIL
-
-0.5
0.4
V
-
High level input voltage
VIH
-
0.7
VDD
VDD(max) +
0.5
V
-
Low level output voltage
VOL
1.5 mA sink current
-
-
0.4
V
-
SDA/SCL load capacitance
CL
155
200
pF
Table 5: Electrical specifications
2.2 Absolute maximum ratings
Stress levels beyond those listed in Table 6 may cause permanent damage to the device. These are stress
ratings only and functional operation of the device at these conditions cannot be guaranteed. Exposure to the
absolute maximum rating conditions for extended periods may affect the reliability of the device. ESD ratings
are for discharge on pins according to IEC 61000-4-2, part 4-2.
Parameter
Rating
Supply voltage, VDD
-0.3 ... +6.5 V
Maximum voltage level at pins SCL, SDA
-0.3 ... +6.5 V
Operating temperature range
-20 ... +85 °C
Storage temperature range15
-40 ... +85 °C
ESD HBM
8 kV
ESD MM
200 V
Table 6: Absolute maximum ratings.
3 Timing specification
3.1 Sensor system timing
Default conditions of 25 °C and 5 V supply voltage apply to values the table below, unless otherwise stated.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Comments
Power-up time
tPU
After hard reset
-
0.4
0.6
ms
Time between power-up and sensor
entering idle state
Measurement duration RH/T
sensor
tMEAS
-
-
10.8
14.4
ms
Duration for a humidity and
temperature measurement
Measurement duration gas
sensor
See Table 13
Table 7: Sensor timing specifications.
14
A 20% higher current is drawn during 5ms on VDDH after entering the measurement mode of the gas sensor.
15
The recommended storage temperature range is 10-50°C. Please consult the Infosheet Handling Instructions Humidity Sensors for more information.
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4 Mechanical specification
4.1 Sensor dimensions and mechanical design
The physical dimension of SMV30 are shown in Figure 6 and Table 8.
Figure 6 Top and front view of SVM30
Parameter
Symbol
Max.
Units
Comment
Length
L
39
mm
-
Width
W
15
mm
-
Width at constriction
WC
14
mm
-
Height
H
6.5
mm
For product version SVM30-Y
7.2
mm
For product version SVM30-J
Table 8 Mechanical dimensions
4.2 Connector specification and pin assignment
The pin assignment is shown in Table 9.
Pin
Name
Comment
1
SCL
I2C serial clock input
2
GND
Ground (negative supply)
3
VDD
Power supply (positive supply)
4
SDA
I2C serial data input / output
Table 9 Pin assigment
SVM30 can be delivered with the connectors listed in Table 10.
Gas sensor
RH/T sensor
H
L
W
WC
WC
1
4
2
3
www.sensirion.com Version 1.1 – March 2019 8/18
Product Version
Connector type
SVM30-Y
Yeonho Electronics, 20037WR-04
SVM30-J
Scondar SCT2001WR -S-4P (compatible to
JST part no. S4B-PH-SM4-TB)
Table 10 Available connector types
5 Interface specification
Default conditions of 25 °C and 5 V supply voltage apply to the timing of the I2C interface specified in Table 11 and
Figure 7.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
SCL clock frequency
fSCL
-
0
-
100
kHz
Hold time (repeated) START condition
tHD;STA
After this period, the first clock
pulse is generated
4.0
-
-
µs
LOW period of the SCL clock
tLOW
-
4.7
-
-
µs
HIGH period of the SCL clock
tHIGH
-
4.0
-
-
µs
Set-up time for a repeated START condition
tSU;STA
-
4.7
-
-
µs
SDA hold time
tHD;DAT
-
0
-
-
ns
SDA set-up time
tSU;DAT
-
250
-
-
ns
SCL/SDA rise time
tR
-
-
-
1000
ns
SCL/SDA fall time
tF
-
-
-
300
ns
SDA valid time
tVD;DAT
-
-
-
3.45
µs
Set-up time for STOP condition
tSU;STO
-
4.0
-
-
µs
Capacitive load on bus line
CB
-
400
pF
Table 11 Communication timing specification
Figure 7 Timing diagram for digital input/output pads. SDA in / out as seen by SVM30. Bold SDA lines are controlled by the sensor; plain SDA
lines are controlled by the micro-controller. Note that SDA valid read time is triggered by falling edge of preceding bit.
SCL
70%
30%
tLOW
1/fSCL
tHIGH
tR
tF
SDA
70%
30%
tSU;DAT
tHD;DAT
DATA IN
tR
SDA
70%
30%
DATA OUT
tVD;DAT
tF
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6 Operation
The SVM30 supports I2C standard mode. For detailed information on the I2C protocol, refer to NXP I2C-bus specification.
All commands and data are mapped to a 16-bit address space. Additionally, data and commands are protected with a
CRC checksum to increase the communication reliability. The 16-bit commands that are sent to the sensor already
include a 3-bit CRC checksum. Data sent from and received by SVM30 is always succeeded by an 8-bit CRC.
In write direction it is mandatory to transmit the checksum, since SVM30 only accepts data if it is followed by the correct
checksum. In read direction it is up to the master to decide if it wants to read and process the checksum.
The device addresses of the two sensors on SVM30 are listed in Table 12.
Sensor
Hex. Code
SGP30
0x58
SHTC1
0x70
Table 12 I2C device addresses of the sensors on SVM30
The typical communication sequence between the I2C master (e.g., a microcontroller in a host device) and the sensor
is described as follows:
1. The sensor is powered up, communication is initialized
2. The I2C master periodically requests measurement and reads data, in the following sequence:
a. I2C master sends a measurement command
b. I2C master waits until the measurement is finished, either by waiting for the maximum execution time or
by waiting for the expected duration and then poll data until the read header is acknowledged by the sensor
(expected durations are listed in Table 13 and Table 7)
c. I2C master reads out the measurement result
6.1 Power-Up and Communication Start
After the supply voltage reaching its specified range (see Table 5) the sensor needs the time tPU (see Table 7) to enter
the idle state. Once the idle state is entered it is ready to receive commands from the master.
Each transmission sequence begins with a START condition (S) and ends with a STOP condition (P) as described in
the I2C-bus specification.
Please note that in case VDD is set to 0 V (GND), e.g. in case of a power off of SVM30, the SCL and SDA pads are
also pulled to GND. Consequently, the I2C bus is blocked while VDD of SVM30 is set to 0 V.
6.2 Measurement Communication Sequence
A measurement communication sequence consists of a START condition, the I2C write header (7-bit I2C device address
plus 0 as the write bit) and a 16-bit measurement command (see Figure 8). The proper reception of each byte is
indicated by the sensor. It pulls the SDA pin low (ACK bit) after the falling edge of the 8th SCL clock to indicate the
reception. With the acknowledgement of the measurement command, SVM30 starts measuring. When the measurement
is in progress, no communication with the sensor is possible and the sensor aborts the communication with a XCK
condition.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
S
ACK
ACK
ACK
P
I2C adress
W
Command MSB
Command LSB
I2C write header
16-bit command
Figure 8 Command access communication sequence.
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After the sensor has completed the measurement, the master can read the measurement results by sending a START
condition followed by an I2C read header. The sensor will acknowledge the reception of the read header and responds
with data. The response data length is listed in Table 13 for SGP30, the one of SHTC1 is 6 bytes incl. checksum. The
response data is structured in data words, where one word consists of two bytes of data followed by one byte CRC
checksum. Each byte must be acknowledged by the microcontroller with an ACK condition for the sensor to continue
sending data. If the sensor does not receive an ACK from the master after any byte of data, it will not continue sending
data. After receiving the checksum for the last word of data, an XCK and STOP condition has to be sent.
The communication data sequences are shown in Figure 9 for SGP30 and in Figure 10 for SHTC1.
Figure 9 Communication sequence for starting a measurement and reading measurement results of SGP30.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
S
ACK
ACK
ACK
P
SHTC1 measuring
1
1
1
0
0
0
0
0
0
1
0
1
1
1
0
0
0
0
1
0
0
1
0
0
I2C address + write
Measurement command MSB
Measurement command LSB
Measurement in progress
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
S
NACK
P
SHTC1 measuring
SHTC1 in idle
state
S
ACK
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
repeated I2C address + read
while meas. is in prog. (polling)
measurement cont’d
measurement
completed
I2C address + read
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
ACK
ACK
ACK
1
0
1
0
0
0
0
1
0
0
1
1
0
0
1
1
0
0
0
1
1
1
0
0
Humidity MSB
Humidity LSB
Humidity CRC checksum
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
ACK
ACK
ACK
P
0
1
1
0
0
1
0
0
1
0
0
0
1
0
1
1
1
1
0
0
0
1
1
1
Temperature MSB
Temperature LSB
Temperature CRC checksum
Figure 10 Communication sequence for starting a measurement and reading measurement results of SHTC1. The numerical example corresponds
to a read humidity-first command with clock stretching enabled. The physical values of the transmitted measurement results are 62.9 %RH and
23.7 °C. Clear blocks are controlled by the microcontroller, grey blocks by SHTC1.
The I2C master can abort the read transfer with a XCK followed by a STOP condition after any data byte if it is not
interested in subsequent data, e.g. the CRC byte or following data bytes, in order to save time. Note that the data cannot
be read more than once, and access to data beyond the specified amount will return a pattern of 1’s.
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6.3 Measurement Commands
The available measurement commands of SGP30 are listed in Table 13 and the ones of SHTC1 in Table 14.
Feature Set
0x0020
Command
Hex. Code
Parameter length
including CRC [bytes]
Response length
including CRC [bytes]
Measurement duration [ms]
Typ.
Max.
Init_air_quality
0x2003
-
-
2
10
Measure_air_quality
0x2008
-
6
10
12
Get_baseline
0x2015
-
6
10
10
Set_baseline
0x201e
6
-
10
10
Set_humidity
0x2061
3
1
10
Measure_test16
0x2032
-
3
200
220
Get_feature_set_version
0x202f
-
3
1
2
Measure_raw_signals
0x2050
-
6
20
25
Table 13 Measurement commands of SGP30
Read T first
Read RH first
0x7866
0x58E0
Table 14 Measurement commands of SHTC1
SGP30 Air Quality Signals
SGP30 uses a dynamic baseline compensation algorithm and on-chip calibration parameters to provide two
complementary air quality signals. Based on the sensor signals a total VOC signal (TVOC) and a CO2 equivalent signal
(CO2eq) are calculated. Sending an “Init_air_quality” command starts the air quality measurement. After the
“Init_air_quality” command, a “Measure_air_quality” command has to be sent in regular intervals of 1s to ensure proper
operation of the dynamic baseline compensation algorithm. The sensor responds with 2 data bytes (MSB first) and 1
CRC byte for each of the two preprocessed air quality signals in the order CO2eq (ppm) and TVOC (ppb). For the first
15s after the “Init_air_quality” command the sensor is in an initialization phase during which a “Measure_air_quality”
command returns fixed values of 400 ppm CO2eq and 0 ppb TVOC.
A new “Init_air_quality” command has to be sent after every power-up or soft reset.
SGP30 Set and Get Baseline
The SGP30 also provides the possibility to read and write the baseline values of the baseline compensation algorithm.
This feature is used to save the baseline in regular intervals on an external non-volatile memory and restore it after a
new power-up or soft reset of the sensor. The command “Get_baseline” returns the baseline values for the two air quality
signals. The sensor responds with 2 data bytes (MSB first) and 1 CRC byte for each of the two values in the order
CO2eq and TVOC. These two values should be stored on an external memory. After a power-up or soft reset, the
baseline of the baseline compensation algorithm can be restored by sending first an “Init_air_quality” command followed
by a “Set_baseline” command with the two baseline values as parameters in the order as (TVOC, CO2eq). An example
implementation of a generic driver for the baseline algorithm can be found in the document
SGP30_driver_integration_guide.
SGP30 Raw Signals
The command “Measure_raw_signals” is intended for part verification and testing purposes. It returns the sensor raw
signals which are used as inputs for the on-chip calibration and baseline compensation algorithms as shown in Figure
5. The command performs a measurement to which the sensor responds with 2 data bytes (MSB first) and 1 CRC byte
16
The «Measure_Test» command is intended for production line testing and verification only. It should not be used after having
issued an “Init_air_quality” command. For the duration of the «Measure_Test» command, the sensor is operated in
measurement mode with a supply current as specified in Table 5. After the command, the sensor is in sleep mode.
www.sensirion.com Version 1.1 – March 2019 12/18
(see Figure 9) for 2 sensor raw signals in the order H2_signal (sout_H2) and Ethanol_signal (sout_EthOH). Both signals can
be used to calculate gas concentrations c relative to a reference concentration cref by
with a = 512, sref the H2_signal or Ethanol_signal output at the reference concentration, and sout = sout_H2
or sout = sout_EthOH.
SGP30 Humidity Compensation
SGP30 features an on-chip humidity compensation for the air quality signals (CO2eq and TVOC) and sensor raw signals
(H2-signal and Ethanol_signal). To use the on-chip humidity compensation an absolute humidity value from an external
humidity sensor like the SHTxx is required. Using the “Set_humidity” command, a new humidity value can be written to
the SGP30 by sending 2 data bytes (MSB first) and 1 CRC byte. The 2 data bytes represent humidity values as a fixed-
point 8.8bit number with a minimum value of 0x0001 (=1/256 g/m3) and a maximum value of 0xFFFF
(255 g/m3 + 255/256 g/m3). For instance, sending a value of 0x0F80 corresponds to a humidity value of 15.50 g/m3
(15 g/m3 + 128/256 g/m3).
After setting a new humidity value, this value will be used by the on-chip humidity compensation algorithm until a new
humidity value is set using the “Set_humidity” command. Restarting the sensor (power-on or soft reset) or sending a
value of 0x0000 (= 0 g/m3) sets the humidity value used for compensation to its default value (0x0B92 = 11.57 g/m3)
until a new humidity value is sent. Sending a humidity value of 0x0000 can therefore be used to turn off the humidity
compensation.
SGP30 Feature Set
SGP30 features a versioning system for the available set of measurement commands and on-chip algorithms. This so
called feature set version number can be read out by sending a “Get_feature_set_version” command. The sensor
responds with 2 data bytes (MSB first) and 1 CRC byte (see Table 15). This feature set version number is used to refer
to a corresponding set of available measurement commands as listed in Table 13.
Most significant byte (MSB)
Least significant byte (LSB)
Bit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Product type
SGP30: 0
Reserved for
future use
0
Product version
Table 15 Structure of the SGP feature set number. Please note that the last 5 bits of the product version (bits 12-16 of the LSB) are subject to
change. This is used to track new features added to the SGP multi-pixel platform.
SGP30 Measure Test
The command “Measure_test” which is included for integration and production line testing runs an on-chip self-test. In
case of a successful self-test the sensor returns the fixed data pattern 0xD400 (with correct CRC).
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6.4 Soft Reset
SGP30
A sensor reset can be generated using the “General Call” mode according to I2C-bus specification. It is important to
understand that a reset generated in this way is not device specific. All devices on the same I2C bus that support the
General Call mode will perform a reset. The appropriate command consists of two bytes and is shown in Table 16.
Command
Hex. Code
Address byte
0x00
Second byte
0x06
Reset Command using the General Call address
0x0006
Table 16 Reset of SGP30 through the General Call address (Clear blocks are controlled by the microcontroller, grey blocks by the
sensor.).
SHTC1
SHTC1 provides a soft reset mechanism that forces the system into a well-defined state without removing the power
supply. If the system is in idle state (i.e. if no measurement is in progress) the soft reset command can be sent to SHTC1
according to Figure 8. This triggers the sensor to reset all internal state machines and reload calibration data from the
memory.
Command
Hex. Code
Bin. Code
Software reset
0x805D
1000’0000’0101’1101
Table 17 Soft reset command for SHTC1
6.5 Get Serial ID
SGP30
The readout of the serial ID register can be used to identify the chip and verify the presence of the sensor. The
appropriate command structure is shown in Table 18. After issuing the measurement command and sending the ACK-
bit the sensor needs the time tIDLE = 0.5ms to respond to the I2C read header with an ACK Bit. Hence, it is recommended
to wait tIDLE =0.5ms before issuing the read header.
The get serial ID command returns 3 words, and every word is followed by an 8-bit CRC checksum. Together the 3
words constitute a unique serial ID with a length of 48 bits.
The ID returned with this command are represented in the big endian (or MSB first) format.
Command
Hex. Code
Read ID register
0x3682
Table 18 Get serial ID command of SGP30
SHTC1
SHTC1 has an ID register which contains an SHTC1-specific product code. The read-out of the ID register can be used
to verify the presence of the sensor and proper communication. The command to read the ID register is shown in Table
19.
Command
Hex. Code
Read ID register
0xEFC8
Table 19 Get serial ID command of SHTC1
S
ACK
General Call Address
1 2 3 4 5 6 7 8 9
ACK
Reset Command
1 2 3 4 5 6 7 8 9
General Call 1st byte General Call 2nd byte
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It needs to be sent to the SHTC1 after an I2C write header. After the SHTC1 has acknowledged the proper reception of
the command, the master can send an I2C read header and the SHTC1 will submit the 16-bit ID followed by 8 bits of
CRC. The structure of the ID is described in Table 20.
16-bit ID
xxxx'xxxx’xx 00’0111
bits 5 to 0: SHTC1-specific product code
bits 15 to 6: unspecified information
Table 20 Structure of the 16-bit ID of SHTC1. Bits 15:6 of the ID contain unspecified information (marked as “x”), which may vary from sensor to
sensor, while bits 5:0 contain the SHTC1-specific product code.
6.6 Checksum Calculation
The 8-bit CRC checksum transmitted after each data word is generated by a CRC algorithm. Its properties are displayed
in Table 21. The CRC covers the contents of the two previously transmitted data bytes. To calculate the checksum only
these two previously transmitted data bytes are used.
Property
Value
Name
CRC-8
Width
8 bit
Protected Data
read and/or write data
Polynomial
0x31 (x8 + x5 + x4 + 1)
Initialization
0xFF
Reflect input
False
Reflect output
False
Final XOR
0x00
Examples
CRC (0xBEEF) = 0x92
Table 21 I2C CRC properties.
6.7 Conversion of the sensor output for RH and T
Measurement data is always transferred as 16-bit values. These values are already linearized and temperature
compensated by SHTC1. Humidity and temperature values can be calculated with the formulae given below.
Temperature conversion formula (result in °C)
Relative humidity conversion formula (result in %RH)
SRH and ST denote the 16-bit sensor outputs (as decimal values) for relative humidity and temperature, respectively.
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7 Application description
7.1 Typical application diagram
A typical application diagram is shown in Figure 11. Because SVM30 already contains pull-up resistors on the I2C lines,
the two resistors shown in the typical application diagram are optional.
Figure 11 Typical application diagram of SVM30
7.2 Mounting recommendations
In order to maintain a good contact of the sensors to the environment, it is recommended to mount the module in a place
where the sensors have good access to ambient air, if possible in direct airflow. In case there is a fan, it is recommended
to mount the module in front of the fan and not behind it, in order to avoid the sensors from measuring the heat generated
by the fan. To guarantee best performance of the module it is recommended to obey the air flow directions across the
module as depicted by the green and red arrows in Figure 12.
In case the module is not placed in an airflow, it is recommended to mount the module such that the RH/T sensor is
below the gas sensor in order to avoid heating of the RH/T sensor by the gas sensor through convection. Experiments
have shown that heat dissipation from the gas sensor is better if the PCB is mounted upright, rather than when it is
mounted flat. To reduce thermal coupling through the substrate the module is mounted on, the substrate should end
close to the connector, not reaching the RH/T sensor.
Figure 12 Recommended direction of incident airflow across the module
SVM30
Control
Unit
5V
I2C
SDA
SCL
10 kΩ (optional)
10 kΩ (optional)
OK
OK (recommended)
Not OK
OK
Gas sensor
RH/T sensor
Substrate
air flow
air flow
air flow
air flow
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8 Quality
The qualification of both SGP30 and SHTC1 is performed based on the JEDEC JESD47 qualification test method.
Additionally, a separate qualification was performed with the SVM30 module.
Visual optical acceptance criteria of the PCB are according to IPC-A-610, class II.
9 Ordering Information
The SVM30 can be delivered in 2 versions with different connector types (see Table 10). Ordering numbers see Table
22.
Product Version
Ordering Number
SVM30-J 800 PCS
3.000.072
SVM30-J 80 PCS
3.000.237
SVM30-Y 800 PCS
3.000.073
SVM30-Y 80 PCS
3.000.238
Table 22 Ordering numbers.
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10 Important notices
10.1 Warning, personal injury
Do not use this product as safety or emergency stop devices or in any other application where failure of the product could result in
personal injury. Do not use this product for applications other than its intended and authorized use. Before installing, handling, using
or servicing this product, please consult the data sheet and application notes. Failure to comply with these instructions could result in
death or serious injury.
If the Buyer shall purchase or use SENSIRION products for any unintended or unauthorized application, Buyer shall defend, indemnify and hold
harmless SENSIRION and its officers, employees, subsidiaries, affiliates and distributors against all claims, costs, damages and expenses, and
reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized
use, even if SENSIRION shall be allegedly negligent with respect to the design or the manufacture of the product.
10.2 ESD precautions
The inherent design of this component causes it to be sensitive to electrostatic discharge (ESD). To prevent ESD-induced damage and/or
degradation, take customary and statutory ESD precautions when handling this product.
See application note “ESD, Latchup and EMC” for more information.
10.3 Warranty
SENSIRION warrants solely to the original purchaser of this product for a period of 12 months (one year) from the date of delivery that this product
shall be of the quality, material and workmanship defined in SENSIRION’s published specifications of the product. Within such period, if proven to
be defective, SENSIRION shall repair and/or replace this product, in SENSIRION’s discretion, free of charge to the Buyer, provided that:
▪ notice in writing describing the defects shall be given to SENSIRION within fourteen (14) days after their appearance;
▪ such defects shall be found, to SENSIRION’s reasonable satisfaction, to have arisen from SENSIRION’s faulty design, material, or workmanship;
▪ the defective product shall be returned to SENSIRION’s factory at the Buyer’s expense; and
▪ the warranty period for any repaired or replaced product shall be limited to the unexpired portion of the original period.
This warranty does not apply to any equipment which has not been installed and used within the specifications recommended by SENSIRION for
the intended and proper use of the equipment. EXCEPT FOR THE WARRANTIES EXPRESSLY SET FORTH HEREIN, SENSIRION MAKES NO
WARRANTIES, EITHER EXPRESS OR IMPLIED, WITH RESPECT TO THE PRODUCT. ANY AND ALL WARRANTIES, INCLUDING WITHOUT
LIMITATION, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY EXCLUDED AND
DECLINED.
SENSIRION is only liable for defects of this product arising under the conditions of operation provided for in the data sheet and proper use of the
goods. SENSIRION explicitly disclaims all warranties, express or implied, for any period during which the goods are operated or stored not in
accordance with the technical specifications.
SENSIRION does not assume any liability arising out of any application or use of any product or circuit and specifically disclaims any and all
liability, including without limitation consequential or incidental damages. All operating parameters, including without limitation recommended
parameters, must be validated for each customer’s applications by customer’s technical experts. Recommended parameters can and do vary in
different applications.
SENSIRION reserves the right, without further notice, (i) to change the product specifications and/or the information in this document and (ii) to
improve reliability, functions and design of this product.
Copyright© 2018, by SENSIRION.
CMOSens® is a trademark of Sensirion
All rights reserved
www.sensirion.com Version 1.1 – March 2019 18/18
11 Revision history
Date
Version
Page(s)
Changes
13. July 2018
1
all
Initial Release
01. March 2019
1.1
16
Added order numbers for 80 PCS package
12 Headquarters and subsidiaries
Sensirion AG
Laubisruetistr. 50
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Switzerland
phone: +41 44 306 40 00
fax: +41 44 306 40 30
info@sensirion.com
www.sensirion.com
Sensirion Inc., USA
phone: +1 312 690 5858
info-us@sensirion.com
www.sensirion.com
Sensirion Korea Co. Ltd.
phone: +82 31 337 7700~3
info-kr@sensirion.com
www.sensirion.co.kr
Sensirion Japan Co. Ltd.
phone: +81 3 3444 4940
info-jp@sensirion.com
www.sensirion.co.jp
Sensirion China Co. Ltd.
phone: +86 755 8252 1501
info-cn@sensirion.com
www.sensirion.com.cn
Sensirion Taiwan Co. Ltd
phone: +886 3 5506701
info@sensirion.com
www.sensirion.com
To find your local representative, please visit www.sensirion.com/distributors
