Data Sheet SCC30-DB
Humidity and Temperature Sensor Module
Relative humidity and temperature output
Superior sensor performance, typical accuracy RH: ±3%, T: ±0.3°C
Fully calibrated and processed digital signal output
2.4 to 5.5V supply voltage range
Product Summary
The RH/T sensor module SCC30-DB is specifically
designed to meet the most demanding requirements of
home appliance applications as well as from other
applications, which require sensing remotely from the main
control board. It offers the superior sensor performance of
capacitive type sensor elements and a very attractive
price/performance ratio due to Sensirion’s latest
generation of highly integrated humidity and temperature
sensors (SHT3x).
All in all, the SHT3x platform incorporates more than ten
years of knowledge of Sensirion, the leader in the
humidity sensor industry.
Customer Benefits:
High reliability & excellent long-term stability due to
capacitive type sensor
Versatile low cost sensor module
Broad and competent application support by
Sensirion.
1
Product Description
The SCC30-DB is a humidity and temperature sensor module with digital I2C output, consisting of a SHT30-DIS humidity and
temperature sensor mounted on a PCB with connector.
Figure 1
SCC30-DB
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2
Sensor Specifications
Temperature
Condition
10 to 90 %RH
Typical
Value
3
0-100
< ±0.8
< 0.25
8
Units
%RH
%RH
%RH
%RH/yr
s
Parameter
Accuracy Tolerance
Operating Range
Storage Range
Long Term Drift
Response Time
5
Condition
0 to 65°C
-
-
-
63%
Typical Value
0.3
-20 to +85
-25 to +85
< 0.04
45
Units
°C
°C
°C
°C/yr
s
Relative Humidity
Parameter
Accuracy
Tolerance
1
Operating Range
Hysteresis
Long Term Drift
3
Response time
4
non-condensing
environment
2
-
-
63%
Table 2
Temperature Performance Specification
Table 1
Relative Humidity Performance Specification
ΔRH [%RH]
ΔT [C]
±10
Maximum accuracy
±1
Typical Accuracy
±8
±6
±4
±2
±0
0
10
20
30
40
±0.8
±0.6
±0.4
±0.2
±0
Maximum Accuracy
Typical Accuracy
50
60
70
80
90
100
-20
0
20
40
60
80
Relative humidity [%RH]
Temperature [°C]
Figure 2
Relative Humidity Accuracy Specification.
Figure 3
Temperature Accuracy Specification
For definition of typical and maximum accuracy tolerance, please refer to the
document “Sensirion Humidity Sensor Specification Statement”.
2
Condensation shall be avoided because of risk of corrosion and leak currents on
the PCB.
3
Typical value for operation in normal RH/T operating range, see section 2.1.
Maximum value is < 0.5 %RH/yr. Value may be higher in environments with
1
vaporized solvents, out-gassing tapes, adhesives, packaging materials, etc. For
more details please refer to Handling Instructions.
4
Time for achieving 63% of a humidity step function, valid at 25°C and 1m/s
airflow. Humidity response time in the application depends on the design-in of the
sensor.
5
Response time is measured when the sensor is exchanged between water
reservoirs of different temperatures
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2.1 Recommended Operating Conditions
The sensor shows best performance when operated within recommended normal temperature and humidity range of 5 °C –
60 °C and 20 %RH – 80 %RH, respectively. Long-term exposure to conditions outside normal range, especially at high
humidity, may temporarily offset the RH signal (e.g. +3%RH after 60h kept at >80%RH). After returning into the normal
temperature and humidity range the sensor will slowly come back to calibration state by itself. Prolonged exposure to extreme
conditions may accelerate ageing.
3
3.1
Electrical Specifications
Electrical Characteristics
Symbol
V
DD
V
POR
Condition
Min.
2.4
1.8
Typ.
3.3
2.1
Max.
5.5
2.4
Units Comments
V
V
Voltage changes on the
VDD line between
V
DD,min
and V
DD
,
max
V/ms should be slower than
the maximum slew rate;
faster slew rates may
lead to reset;
Current when sensor is
not performing a
µA
measurement during
single shot mode
Current when sensor is
not performing a
µA
measurement during
periodic data
acquisition mode
Current consumption
µA
while sensor is
measuring
Current consumption
(operation with one
measurement per
µA
second at lowest
repeatability, single
shot mode)
Parameter
Supply voltage
Power-up/down level
Slew rate change of the
supply voltage
V
DD,slew
-
-
20
idle state
-
(single shot mode)
0.2
2.0
idle state
(periodic data
acquisition mode)
Supply current
I
DD
Measuring
-
45
-
-
800
1500
Average
-
2
-
Table 3
Electrical specifications, values measured at 25°C.
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3.2
Timing Specifications
Symbol
t
PU
Conditions
After hard reset, V
DD
≥ V
POR
After soft reset.
Low repeatability
Medium repeatability
High repeatability
Min.
-
Typ.
0.5
Max.
1.5
Units
ms
Comments
Time between VDD reaching
VPOR and sensor entering idle
state
Time between ACK of soft reset
command and sensor entering idle
state
The three repeatability modes
differ with respect to measurement
duration, noise level and energy
consumption.
Parameter
Power-up time
Soft reset time
t
SR
t
MEAS,l
t
MEAS,m
t
MEAS,h
-
-
-
-
0.5
2.5
4.5
12.5
1.5
4.5
6.5
15.5
ms
ms
ms
ms
Measurement
duration
Table 4
System timing specifications, valid from -40 °C to 125 °C and VDDmin to VDDmax
3.3 Absolute Minimum and Maximum Ratings
Stress levels beyond those listed in Table 5 may cause permanent damage to the device or affect the reliability of the sensor.
These are stress ratings only and functional operation of the device at these conditions cannot be guaranteed.
Parameter
Supply voltage V
DD
Max Voltage on pins SDA and SCL
Input current on any pin
Temperature range
ESD HBM (human body model)
6
Rating
-0.3 to 6
-0.3 to VDD+0.3
±100
-25 to 85
4
Units
V
V
mA
°C
kV
Table 5
Absolute minimum and maximum ratings; values are target specs and not confirmed by measurements yet
4
Pin Assignment
The connector of the SCC30-DB is Scondar SCT2001WR-S-4P (compatible to JST part no. S4B-PH-SM4-TB)
.
Pin
No.
1
2
3
4
Name
SCL
VSS
VDD
SDA
Description
Serial
data; input
/ output
Ground
Supply
Voltage
Serial
clock; input
/ output
1
2
3
4
Figure 4
Connector pin assignment of the SCC30-DB module.
6
According to JEDEC JS-001
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4.1
Typical Application Circuit
power
supply
SCC30-DB
10kΩ
10kΩ
MCU
VDD
VSS
SDA
SCL
+
SDA
VDD
VSS
Figure 5
Typical application circuit for the SCC30-DB module.
5
Operation and Communication
The SCC30-DB supports I2C normal and fast mode. Low frequencies (below 100 kHz) are recommended for applications
where the module is connected by a cable because of capacitive coupling of cables with the I2C bus. For detailed information
on the I2C protocol, refer to NXP I2C-bus specification
7
.
After sending a command to the sensor a minimal waiting time of 1ms is needed before another command can be received by
the sensor. Furthermore, to keep self-heating below 0.1°C, the SCC30-DB should not be active for more than 10% of the time.
All SCC30-DB commands and data are mapped to a 16-bit address space. Additionally, data and commands are protected with
a CRC checksum. This increases communication reliability. The 16 bits commands to the sensor already include a 3 bit CRC
checksum. Data sent from and received by the sensor is always succeeded by an 8 bit CRC.
In write direction it is mandatory to transmit the checksum, since the SCC30-DB only accepts data if it is followed by the correct
checksum. In read direction it is left to the master to read and process the checksum.
5.1 I2C Address
The I2C device address is given Table 6:
SCC30-DB
Hex. Code Bin. Code
I
2
C address
0x44
100’0100
Table 6
SCC30-DB
I
2
C
device address.
Each transmission sequence begins with START condition (S) and ends with an (optional) STOP condition (P) as described in
the I2C-bus specification.
5.2 Power-Up and Communication Start
The sensor starts powering-up after reaching the power-up threshold voltage V
POR
specified in Table 3. After reaching this
threshold voltage the sensor needs the time t
PU
to enter idle state. Once the idle state is entered it is ready to receive
commands from the master (microcontroller).
Each transmission sequence begins with a START condition (S) and ends with a STOP condition (P) as described in the I2C-
bus specification. Whenever the sensor is powered up, but not performing a measurement or communicating, it automatically
enters idle state for energy saving. This idle state cannot be controlled by the user.
5.3 Starting a Measurement
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. 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. A complete measurement cycle is
depicted in Table 7.
With the acknowledgement of the measurement command, the SCC30-DB starts measuring humidity and temperature.
7
http://www.nxp.com/documents/user_manual/UM10204.pdf
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