CMOSens® Technology for IR detection enables carbon dioxide measurements of the highest accuracy at a
competitive price.
Along with the NDIR measurement technology for detecting CO
2
comes a best-in-class Sensirion humidity and
temperature sensor integrated on the very same sensor module. Ambient humidity and temperature can be
measured by Sensirion’s algorithm expertise through modelling and compensating of external heat sources
without the need of any additional components. The very small module height allows easy integration into
different applications.
Carbon Dioxide is a key indicator for indoor air quality. Thanks to new energy standards and better insulation,
houses have become increasingly energy-efficient, but the air quality can deteriorate rapidly. Active ventilation
is needed to maintain a comfortable and healthy indoor environment and improve the well-being and productivity
of the inhabitants. Sensirion sensor solutions offer an accurate and stable monitoring of CO
2
in the air, as well
as temperature and humidity. This enables our customers to develop new solutions that increase energy
efficiency and simultaneously support the well-being of everyone.
Content
1 Sensor Specifications
2 Package Outline Drawing
3 Pin-Out Diagram
4 Operation and Communication
5 Shipping Package
6 Ordering Information
7 Important Notices
8 Headquarters and Subsidiaries
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1 Sensor Specifications
1
CO
2
Sensor Specifications
Parameter
CO
2
measurement range
Accuracy
2
Repeatability
3
Temperature stability
4
Response time
5
Accuracy drift over lifetime
6
Conditions
I2C, UART
PWM
400 ppm – 10’000 ppm
400 ppm – 10’000 ppm
T = 0 … 50°C
τ
63%
Value
0 – 40’000 ppm
0 – 5’000 ppm
± (30 ppm + 3%MV)
± 10 ppm
± 2.5 ppm / °C
20 s
400 ppm – 10’000 ppm
ASC field-calibration algorithm activated and
± 50 ppm
SCD30 in environment allowing for ASC, or
FRC field-calibration algorithm applied.
Table 1:
SCD30 CO
2
sensor specifications
Humidity Sensor Specifications
7
Parameter
Humidity measurement range
Accuracy
8
Repeatability
3
Response time
5
Accuracy drift
Table 2:
SCD30 humidity sensor specifications
Conditions
-
25°C, 0 – 100 %RH
-
τ
63%
-
Value
0 %RH – 100 %RH
± 3 %RH
± 0.1 %RH
8s
< 0.25 %RH / year
Temperature Sensor Specifications
7
Parameter
Temperature measurement range
9
Accuracy
8
Repeatability
3
Response time
5
Accuracy drift
Conditions
-
0 – 50°C
-
τ
63%
-
Value
- 40°C – 70°C
± (0.4°C + 0.023
×
(T [°C] – 25°C))
± 0.1°C
> 10 s
< 0.03 °C / year
Table 3:
SCD30 temperature sensor specifications
Default conditions of T = 25°C, humidity = 50 %RH, p = 1013 mbar, V
DD
= 3.3 V, continuous measurement mode with measurement rate = 2 s apply to values
listed in the tables, unless otherwise stated.
2
Deviation to a high-precision reference in the calibrated range (400 – 10’000 ppm) of the SCD30. Accuracy is fulfilled by > 90% of the sensors after calibration.
Rough handling, shipping and soldering reduces the accuracy of the sensor. Full accuracy is restored with FRC or ASC recalibration features. Accuracy is based
on tests with gas mixtures having a tolerance of ± 1.5%.
3
RMS error of consecutive measurements at constant conditions. Repeatability is fulfilled by > 90% of the sensors.
4
Average slope of CO
2
accuracy when changing temperature, valid at 400 ppm. Fulfilled by > 90% of the sensors after calibration.
5
Time for achieving 63% of a respective step function. Response time depends on design-in, heat exchange and environment of the sensor in the final application.
6
CO
2
concentrations < 400 ppm may result in sensor drifts when ASC is activated. For proper function of ASC field-calibration algorithm SCD30 has to be exposed
to air with CO
2
concentration 400 ppm regularly.
7
Design-in of the SCD30 in final application and the environment impacts the accuracy of the RH/T sensor. Heat sources have to be considered for optimal
performance. Please use integrated on-board RH/T compensation algorithm to account for the actual design-in.
8
Deviation to a high-precision reference. Accuracy is fulfilled by > 90% of the sensors after calibration.
9
RH/T sensor component is capable of measuring up to T = 120°C. Measuring at T > 70°C might result in permanent damage of the sensor.
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Electrical Specifications
Parameter
Average current
10
Max. current
DC supply voltage (Vdd
min -
Vdd
max
)
Interface
Input high level voltage (V
IH
)
I2C
Input high level voltage (V
IH
)
Modbus
Input low level voltage (V
IL
)
I2C/Modbus
Output low level voltage (V
OL
)
I2C/Modbus
Output high level voltage (V
OH
)
I2C/Modbus
Table 4
SCD30 electrical specifications
Conditions
Update interval 2 s
During measurement
Min. and max. criteria to operate SCD30
-
Min. and max. criteria to operate SCD30
Min. and max. criteria to operate SCD30
Min. and max. criteria to operate SCD30
I
IO =
+8 mA, Max. criteria
I
IO =
-6 mA, Min. criteria
Value
19 mA
75 mA
3.3 V – 5.5 V
UART (Modbus Point to Point; TTL Logic),
PWM and I
2
C
1.75 V - 3.0 V
1.75 V – 5.5 V
- 0.3 V – 0.9 V
0.4 V
2.4 V
Operation Conditions, Lifetime and Maximum Ratings
Parameter
Temperature operating conditions
Humidity operating conditions
DC supply voltage
Voltage to pull up selector-pin
Voltage to pull up selector-pin
Storage temperature conditions
Maintenance Interval
Sensor lifetime
Conditions
Valid for CO
2
sensor.
Non-condensing. Valid for CO
2
sensor.
Exceeding specified range will result in
damage of the sensor.
Max criteria
Min criteria
Exceeding specified range will result in
damage of the sensor.
Maintenance free when ASC field-
calibration algorithm
11
is used.
-
Value
0 – 50°C
0 – 95 %RH
- 0.3 V – 6.0V
4.0 V
1.75 V
- 40°C – 70°C
None
15 years
Table 5:
SCD30 operation conditions, lifetime and maximum ratings
10
11
Average current including idle state and processing. Other update rates for small power budgets can be selected via the digital interface.
CO
2
concentrations < 400 ppm may result in sensor drifts. For proper function of ASC field-calibration algorithm SCD30 has to be exposed to air with 400 ppm
regularly.
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2 Package Outline Drawing
Figure 1
Product outline drawing of SCD30. Pictures on the left show top-view, pictures on the right bottom-view.
Sensor height is 7 mm at the thickest part of SCD30. The weight of one SCD30 sensor is 3.4 g.
Table 6:
Nominal dimensions and tolerances SCD30
Dimension
Nominal [mm]
Tolerance [mm]
A
23.00
± 0.20
B
35.00
± 0.20
C
7.00
± 0.70
D
1.60
± 0.20
1.00
E
± 0.15
F
15.24
± 0.30
G
1.40
± 0.15
H
1.40
± 0.15
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3 Pin-Out Diagram
Pin
VDD
GND
TX/
SCL
RX/
SDA
RDY
PWM
Comments
Supply Voltage
Ground
Modbus: Transmission line (Push/Pull with 3V level)
I
2
C: Serial clock (internal 45kΩ pull-up resistor, pulled
to 3V, for higher voltages a level shifter is needed)
Modbus: Receive line (Input must not exceed 5.5V)
I
2
C: Serial data (internal 45kΩ pull-up resistor, pulled
to 3V, for higher voltages a level shifter is needed)
Data ready pin. High when data is ready for read-out
PWM output of CO
2
concentration measurement
Interface select pin. Pull to VDD (do not exceed 4V, use
voltage divider in case your VDD is >4V) for selecting
Modbus, leave floating or connect to GND for selecting
I
2
C.
SEL
Figure 2:
Pin-out of the SCD30.
4 Operation and Communication
Communication lines for I2C have an internal pull-up (45kOhm) to 3V, for higher voltages a level shifter is needed.
Check VIH level of your I2C master to determine communication voltage. Please visit the download center of Sensirion
webpage for the I2C, Modbus and PWM interface documentation
12
.
5 Shipping Package
SCD30 sensor is shipped in stackable trays with 40 pieces each. The tray dimension is 363 mm x 257 mm x 19 mm.
Stacking of trays results in an effective tray height of 13 mm.
6 Ordering Information
SCD30 and accessory can be ordered via the following article numbers.
Product
SCD30 sensor
SEK-SCD30-Sensor
SEK-SensorBridge
Description
CO
2
, RH and T sensor module
Standalone SCD30 sensor for EvalKit
Sensor Bridge to connect SEK-SCD30-Sensor to computer
