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PDF SHT71 Data sheet ( Hoja de datos )
| Número de pieza | SHT71 | |
| Descripción | Humidity & Temperature Sensor | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SHT71 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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SHT1x / SHT7x
Humidity & Temperature Sensor
Evaluation Kit
Available
- Relative humidity and temperature sensors
- Dew point
- Fully calibrated, digital output
- Excellent long-term stability
- No external components required
- Ultra low power consumption
- Surface mountable or 4-pin fully interchangeable
- Small size
- Automatic power down
SHT7x
SHT1x
SHT1x / SHT7x Product Summary
The SHTxx is a single chip relative humidity and
temperature multi sensor module comprising a calibrated
digital output. Application of industrial CMOS processes with
patented micro-machining (CMOSens® technology) ensures
highest reliability and excellent long term stability. The
device includes a capacitive polymer sensing element for
relative humidity and a bandgap temperature sensor. Both
are seamlessly coupled to a 14bit analog to digital converter
and a serial interface circuit on the same chip. This results in
superior signal quality, a fast response time and insensitivity
to external disturbances (EMC) at a very competitive price.
Each SHTxx is individually calibrated in a precision humidity
chamber with a chilled mirror hygrometer as reference. The
calibration coefficients are programmed into the OTP
memory. These coefficients are used internally during
measurements to calibrate the signals from the sensors.
The 2-wire serial interface and internal voltage regulation
allows easy and fast system integration. Its tiny size and low
power consumption makes it the ultimate choice for even
the most demanding applications.
The device is supplied in either a surface-mountable LCC
(Leadless Chip Carrier) or as a pluggable 4-pin single-in-line
type package. Customer specific packaging options may be
available on request.
Applications
_ HVAC
_ Automotive
_ Consumer Goods
_ Weather Stations
_ Humidifiers
_ Dehumidifiers
_ Test & Measurement
_ Data Logging
_ Automation
_ White Goods
_ Medical
1
Ordering Information
Part
Number
Humidity
accuracy
[%RH]
Temperature
accuracy [K]
@ 25 °C
Package
SHT11
SHT15
SHT71
SHT75
±3.0
±2.0
±3.0
±1.8
±0.4 SMD (LCC)
±0.3 SMD (LCC)
±0.4 4-pin single-in-line
±0.3 4-pin single-in-line
Block Diagram
%RH
Sensor
Temp.
Sensor
Calibration
Memory
D
A
Digital 2-
wire
Interface
&
CRC
generator
SCK
DATA
GND
VDD
www.sensirion.com
Sensirion, Eggbühlstr. 14, 8052 Zürich, Switzerland, Tel: +41 1 306 40 00, Fax: +41 1 306 40 30 v2.02
1 page  
SHT1x / SHT7x Relative Humidity & Temperature Sensor System
3 Converting Output to Physical Values
3.1 Relative Humidity
To compensate for the non-linearity of the humidity sensor
and to obtain the full accuracy it is recommended to convert
the readout with the following formula1:
RHlinear = c1 + c 2 • SORH + c 3 • SORH2
SORH
c1
c2 c3
12 bit -4 0.0405 -2.8 * 10-6
8 bit -4 0.648 -7.2 * 10-4
Table 6 Humidity conversion coefficients
For simplified, less computation intense conversion formulas
see application note “RH and Temperature Non-Linearity
Compensation”.
The humidity sensor has no significant voltage dependency.
&
$
"
#
#
#
SORH sensor readout (12bit)
Figure 10 Conversion from SORH to relative humidity
!
3.1.1 Humidity Sensor RH/Temperature compensation
For temperatures significantly different from 25 °C (~77 °F)
the temperature coefficient of the RH sensor should be
considered:
RHtrue = (T°C - 25)•(t1 + t 2 •SORH) +RHlinear
SORH
t1
t2
12 bit 0.01 0.00008
8 bit 0.01 0.00128
Table 7 Temperature compensation coefficients
This equals ~0.12 %RH / °C @ 50 %RH
3.2 Temperature
The bandgap PTAT (Proportional To Absolute Temperature)
temperature sensor is very linear by design. Use the
following formula to convert from digital readout to
temperature:
Temperature = d1 + d2 •SOT
VDD d1 [°C]
5V -40.00
4V -39.75
3.5V -39.66
3V -39.60
2.5V -39.55
d1 [°F]
-40.00
-39.50
-39.35
-39.28
-39.23
SOT
14bit
12bit
d2 [°C] d2 [°F]
0.01 0.018
0.04 0.072
Table 8 Temperature conversion coefficients
For improved accuracies in extreme temperatures with more
computation intense conversion formulas see application
note “RH and Temperature Non-Linearity Compensation”.
3.3 Dewpoint
Since humidity and temperature are both measured on the
same monolithic chip, the SHTxx allows superb dewpoint
measurements. See application note “Dewpoint calculation”
for more.
1 Where SORH is the sensor output for relative humidity
www.sensirion.com
v2.02 July 2004
5/9
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| PDF Descargar | [ Datasheet SHT71.PDF ] | |
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