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SHT1X Datasheet PDF : 9 Pages
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SHT1x / SHT7x Relative Humidity & Temperature Sensor System
1 Sensor Performance Specifications
Parameter
Conditions Min. Typ. Max. Units
Humidity
Resolution (2)
0.5 0.03 0.03 %RH
8 12 12 bit
Repeatability
±0.1
%RH
Accuracy (1)
linearized see figure 1
Uncertainty
Interchangeability
Fully interchangeable
Nonlinearity
raw data
±3
%RH
linearized
<<1
%RH
Range
0
100 %RH
Response time 1/e (63%)
4
slowly moving air
Hysteresis
±1
s
%RH
Long term stability typical
< 0.5
%RH/yr
Temperature
Resolution (2)
Repeatability
Accuracy
Range
Response Time
0.04 0.01 0.01 °C
0.07 0.02 0.02 °F
12 14 14 bit
±0.1
°C
±0.2
°F
see figure 1
-40
123.8 °C
-40
254.9 °F
1/e (63%) 5
30 s
Table 1 Sensor Performance Specifications
Relative Humidity absolute accuracy
%RH
±5
±4
±3
SHT11/71
±2
SHT15
±1
SHT75
±0
%RH
0 10 20 30 40 50 60 70 80 90 100
±3 °C
Temperature accuracy
±5.4 °F
±2 °C
SHT11/71
±3.6 °F
±1 °C
±1.8 °F
SHT15/75
0 °C
-40°C
-40°F
0 °F
0°C
40°C
80°C
120°C
32°F
104°F
176°F
248°F
Dewpoint accuracy @ 25 °C (typical)
±5 °C
±9.0 °F
±4 °C
±7.2 °F
±3 °C
±5.4 °F
±2 °C SHT15
±1 °C
±0 °C
SHT75
SHT11/71
±3.6 °F
±1.8 °F
%RH
0 10 20 30 40 50 60 70 80 90 100
Figure 1 Rel. Humidity, Temperature and Dewpoint accuracies
2 Interface Specifications
uC
(master)
Vdd
GND
DATA
SCK
Vdd 2.4 - 5.5V
Figure 2 Typical application circuit
SHT1x
(slave)
2.1 Power Pins
The SHTxx requires a voltage supply between 2.4 and 5.5 V.
After powerup the device needs 11ms to reach its “sleep”
state. No commands should be sent before that time.
Power supply pins (VDD, GND) may be decoupled with a
100 nF capacitor.
2.2 Serial Interface (Bidirectional 2-wire)
The serial interface of the SHTxx is optimized for sensor
readout and power consumption and is not compatible with
I2C interfaces, see FAQ for details.
2.2.1 Serial clock input (SCK)
The SCK is used to synchronize the communication between
a microcontroller and the SHTxx. Since the interface
consists of fully static logic there is no minimum SCK
frequency.
2.2.2 Serial data (DATA)
The DATA tristate pin is used to transfer data in and out of
the device. DATA changes after the falling edge and is
valid on the rising edge of the serial clock SCK. During
transmission the DATA line must remain stable while SCK is
high. To avoid signal contention the microcontroller should
only drive DATA low. An external pull-up resistor (e.g. 10 kΩ )
is required to pull the signal high. (See Figure 2) Pull-up
resistors are often included in I/O circuits of microcontrollers.
See Table 5 for detailed IO characteristics.
(1) Each SHTxx is tested to be fully within RH accuracy specifications at 25 °C (77 °F) and 48 °C (118.4 °F)
(2) The default measurement resolution of 14bit (temperature) and 12bit (humidity) can be reduced to 12 and 8 bit through the status register.
www.sensirion.com
v2.02 July 2004
2/9
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