Datasheet SHTC3
Humidity and Temperature Sensor IC
Ultra-low power consumption
Full battery supply voltage range (1.62 - 3.6 V)
Small DFN package: 2 × 2 × 0.75 mm
3
Typical accuracy: ±2 %RH and ±0.2 °C
Fully calibrated and reflow solderable
Power-up and measurement within 1 ms
Product Summary
The SHTC3 is a digital humidity and temperature sensor
designed especially for battery-driven high-volume
consumer electronics applications. This sensor is strictly
designed to overcome conventional limits for size, power
consumption, and performance to price ratio in order to
fulfill current and future requirements. Sensirion’s
CMOSens
®
technology offers a complete sensor system
on a single chip, consisting of a capacitive humidity sensor,
a bandgap temperature sensor, analog and digital signal
processing, A/D converter, calibration data memory, and a
digital communication interface supporting I
2
C Fast Mode
Plus. The small 2 × 2 × 0.75 mm
3
DFN package enables
applications in even the most limited of spaces.
The sensor covers a humidity measurement range of 0 to
100 %RH and a temperature measurement range of
- 40 °C to 125 °C with a typical accuracy of ±2 %RH and
±0.2°C. The broad supply voltage of 1.62 V to 3.6 V and
an energy budget below 1 µJ per measurement make the
SHTC3 suitable for mobile or wireless applications
powered by batteries. With the industry-proven quality and
reliability of Sensirion’s humidity and temperature sensors
and constant accuracy over a large measurement range,
the SHTC3 offers best performance-to-price ratio. Tape
and reel packaging together with suitability for standard
SMD assembly processes make the SHTC3 predestined
for high-volume applications.
Benefits of Sensirion’s CMOSens
®
Technology
High reliability and long-term stability
Industry-proven technology with a track record of
more than 15 years
Designed for mass production
Optimized for lowest cost
High signal-to-noise ratio
Block diagram
RH sensor
Signal conditioning
T sensor
Signal conditioning
Contents of this Data Sheet
1 Humidity and Temperature Sensor
Specifications ............................................................ 2
2 Electrical Specifications ..................................... 3
3 Timing Specifications......................................... 4
4 Interface Specifications ..................................... 6
5 Operation and Communication .......................... 6
6 Quality ............................................................... 9
7 Packaging and Traceability ............................... 9
8 Ordering Information.......................................... 9
9 Technical Drawings ......................................... 10
10 Further Information .......................................... 11
ADC
analog
digital
Data processing and system control
Calibration mem.
VDD
VSS
I
2
C interface
SDA
SCL
Figure 1
Functional block diagram of the SHTC3.
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1
Humidity and Temperature Sensor Specifications
Temperature
Condition
Typ.
Max.
-
-
-
extended
5
63%
Typ.
Value
2.0
see Figure 2
0.1
0.01
1
0 to 100
8
<0.25
Unit
%RH
%RH
%RH
%RH
%RH
%RH
s
%RH/y
Parameter
Accuracy tolerance
1
Repeatability
2
Resolution
3
Specified range
4
Response time
8
Long-term drift
9
Condition
Typ.
Max.
-
-
-
63%
Typ.
Value
0.2
see Figure 3
0.1
0.01
–40 to +125
<5 to 30
<0.02
Unit
°C
°C
°C
°C
°C
s
°C/y
Relative Humidity
Parameter
Accuracy tolerance
1
Repeatability
2
Resolution
3
Hysteresis
Specified range
4
Response time
6
Long-term drift
7
Table 2
Temperature sensor specifications.
Table 1
Humidity sensor specifications.
ΔRH [%RH]
ΔT [C]
±1.6
Maximum accuracy
Typical Accuracy
Maximum Accuracy
±6
±4
±2
±0
0
10
20
30
40
±1.2
±0.8
±0.4
±0
-40
-20
0
20
Typical Accuracy
50
60
70
80
90
100
40
60
80
100
120
Relative humidity [%RH]
Temperature [°C]
Figure 2
Typical and maximal tolerance for relative humidity in %RH
at 25 °C.
Figure 3
Typical and maximal tolerance for temperature sensor in
°C.
For definition of typ. and max. accuracy tolerance, please refer to the document
“Sensirion Humidity Sensor Specification Statement”. Specification applies to
normal mode.
2
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. Specification applies to normal mode.
3
Resolution of A/D converter. Specification applies to normal mode.
4
Specified range refers to the range for which the humidity or temperature sensor
specification is guaranteed.
5
For details about recommended humidity and temperature operating range, please
refer to section 1.2.
1
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.
7
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.
8
Temperature response time depends on heat conductivity of sensor
substrate and design-in of sensor in application.
9
Max. value is < 0.04°C/y.
6
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1.1 RH Accuracy at Various Temperatures
Typical RH accuracy at 25°C is defined in Figure 2. For
other temperatures, typical accuracy has been evaluated to
be as displayed in Figure 4.
100
90
80
70
60
50
40
30
20
10
0
±3.5
±3.5
±3
±3
±2.5
±2.5
±2.5
±2.5
±2.5
±3
±3.5
0
±3
±3
±2.5
±2.5
±2
±2
±2
±2
±2.5
±3
±3.5
10
±3
±2.5
±2
±2
±2
±2
±2
±2
±2
±2.5
±3
20
±3
±2.5
±2
±2
±2
±2
±2
±2
±2
±2.5
±3
±3
±2.5
±2
±2
±2
±2
±2
±2
±2
±2.5
±3
±3
±2.5
±2.5
±2
±2
±2
±2
±2
±2
±2.5
±3
±3.5
±3
±2.5
±2.5
±2
±2
±2
±2
±2
±2.5
±3
±4
±3.5
±3
±2.5
±2.5
±2
±2
±2
±2
±2.5
±3
70
±4
±4
±3.5
±3
±2.5
±2.5
±2
±2
±2
±2.5
±3
80
1.2 Recommended Operating Conditions
The sensor performs best when operated within the
recommended normal temperature and humidity range of 5 –
60 °C and 20 – 80 %RH, respectively. Long-term exposure to
conditions outside the normal range, especially at high
humidity, may temporarily offset the RH signal (e.g. +3%RH
after 60h at >80%RH). After returning to normal temperature
and humidity range the sensor will slowly come back to its
calibration state by itself. Prolonged exposure to extreme
conditions may accelerate ageing.
To ensure stable operation of the humidity sensor, the
conditions described in the document “SHTxx Assembly of
SMD Packages”, section “Storage and Handling Instructions”
regarding exposure to volatile organic compounds have to be
met. Please note as well that this does apply not only to
transportation and manufacturing, but also to operation of the
SHTC3.
Relative Humidity [%RH]
30 40 50 60
Temperature [°C]
Figure 4
Typical accuracy of relative humidity measurements given
in %RH for temperatures 0°C … 80°C.
2
Electrical Specifications
2.1 Electrical Characteristics
Default conditions of 25 °C and 3.3 V supply voltage apply to values in the table below, unless otherwise stated.
Parameter
Supply voltage
Power-up/down level
Symbol
V
DD
V
POR
Conditions
Static power supply
Idle state
Min
1.62
1.28
-
Typ.
3.3
1.4
45
Max
3.6
1.55
70
Units Comments
V -
V -
After power-up the sensor
remains in the idle state unless
µA
a sleep command is issued or
other data transmission is active
When in sleep mode, the sensor
requires a dedicated wake-up
µA
command to enable further I
2
C
communication
µA Average current consumption
µA while the sensor is measuring
Average current consumption
µA (continuous operation with one
measurement per second)
Average current consumption
µA (continuous operation with one
measurement per second)
V -
V -
V -
Sleep Mode
Supply current
I
DD
Normal Mode
Low Power M.
Normal Mode
Average
Low Power M.
Low level input voltage
High level input voltage
Low level output voltage
V
IL
V
IH
V
OL
-
-
3 mA sink current
-
-
-
-
0.3
430
270
4.9
0.6
900
570
-
Measurement
-
-
0.7 V
DD
-
0.5
-
-
-
-
0.42 V
DD
-
0.2 V
DD
Table 3
Electrical specifications.
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2.2 Absolute Maximum Ratings
Stress levels beyond the limits listed in Table 4 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. Parameters are only tested each at a time.
Parameter
Supply voltage, V
DD
Operating temperature range
Storage temperature range
10
ESD HBM (human body model)
11
ESD CDM (change device model)
12
Latch up, JESD78 Class II, 125°C
Table 4
Absolute maximum ratings.
Rating
-0.3 to +4 V
-40 to +125 °C
-40 to +125 °C
-2 to 2 kV
-500 to 500 V
-100 to 100 mA
3
Timing Specifications
3.1 Sensor System Timings
Default conditions of 25 °C and 3.3 V supply voltage apply to values the table below, unless otherwise stated. Max. values are
measured at -40 °C.
Parameter
Power-up time
Symbol
t
PU
Conditions
After hard reset, V
DD
≥ V
POR
Min.
-
Typ.
180
Max.
240
Units Comments
Time between V
DD
reaching V
PU
µs and sensor entering the idle
state
Time between ACK of soft reset
µs command and sensor entering
the idle state
ms
Duration for a humidity and
temperature measurement
Soft reset time
Measurement duration
t
SR
t
MEAS
After soft reset.
Average
Normal Mode
Low Power M.
-
-
-
180
10.8
0.7
240
12.1
0.8
Table 5
System timing specifications.
The recommended storage temperature range is 10-50°C. Please consult the document “SHTxx Handling Instructions” for more information.
According to ANSI/ESDA/JEDEC JS-001-2014; AEC-Q100-002.
12
According to ANSI/ESD S5.3.1-2009; AEC-Q100-011.
10
11
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3.2 Communication Timings
Default conditions of 25 °C and 3.3 V supply voltage apply to values in the table below, unless otherwise stated.
Parameter
SCL clock frequency
Hold time (repeated) START
condition
LOW period of the SCL clock
HIGH period of the SCL clock
Set-up time for a repeated
START condition
SDA hold time
SDA set-up time
SCL/SDA rise time
SCL/SDA fall time
SDA valid time
Set-up time for STOP
condition
Capacitive load on bus line
Symbol
f
SCL
t
HD;STA
t
LOW
t
HIGH
t
SU;STA
t
HD;DAT
t
SU;DAT
t
R
t
F
t
VD;DAT
t
SU;STO
C
B
Conditions
-
After this period, the first
clock pulse is generated
-
-
-
-
-
-
-
-
-
-
Min.
0
260
500
260
260
0
50
-
-
-
260
-
Typ.
-
-
-
-
-
-
-
-
-
-
-
-
Max.
1
-
-
-
-
-
-
120
120
400
-
550
Units Comments
MHz -
ns
ns
ns
ns
-
ns
ns
ns
ns
ns
pF
-
-
-
-
-
-
-
-
-
-
-
Table 6
Communication timing specifications. The numbers above are values according to the I
2
C Fast Mode Plus specification.
1/f
SCL
t
HIGH
t
LOW
t
R
t
F
70%
30%
t
HD;DAT
70%
30%
t
VD;DAT
DATA OUT
SCL
t
SU;DAT
DATA IN
SDA
t
F
t
R
SDA
70%
30%
Figure 5
Timing diagram for digital input/output pads. SDA directions as seen from the sensor. 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 toggle.
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