Datasheet SHT7x (SHT71, SHT75)
Humidity and Temperature Sensor
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Fully calibrated
Digital output
Low power consumption
Excellent long term stability
Pin type package – easy integration
Product Summary
SHT7x (including SHT71 and SHT75) is Sensirion’s family
of relative humidity and temperature sensors with pins.
The sensors integrate sensor elements plus signal
processing in compact format and provide a fully
calibrated digital output. A unique capacitive sensor
element is used for measuring relative humidity while
temperature is measured by a band-gap sensor. The
applied CMOSens® technology guarantees excellent
reliability and long term stability. Both sensors are
seamlessly coupled to a 14bit analog to digital converter
and a serial interface circuit. This results in superior signal
quality, a fast response time and insensitivity to external
disturbances (EMC).
Each SHT7x is individually calibrated in a precision
humidity chamber. The calibration coefficients are
programmed into an OTP memory on the chip. These
coefficients are used to internally calibrate the signals
from the sensors. The 2-wire serial interface and internal
voltage regulation allows for easy and fast system
integration. The small size and low power consumption
makes SHT7x the ultimate choice for even the most
demanding applications.
Dimensions
Sensor Chip
SHT7x is supplied on FR4 with pins which allows for easy
integration or replacement. The same sensor is also
available as surface mountable packaging (SHT1x) or on
flex print (SHTA1).
3.1
2.2
3.7
Ø 0.4
6.4
B2G
13.5
0.6
1.2
19.5
3.7
71
Material Contents
While the sensor is made of a CMOS chip the sensor
housing consists of an LCP cap with epoxy glob top on an
FR4 substrate. Pins are made of a Cu/Be alloy coated with
Ni and Au. The device is fully RoHS and WEEE compliant,
thus it is free of Pb, Cd, Hg, Cr(6+), PBB and PBDE.
1 2 3 4
6.0
3.4
SHT7x V4 – for which this datasheet applies – features a
version 4 Silicon sensor chip. Besides a humidity and a
temperature sensor the chip contains an amplifier, A/D
converter, OTP memory and a digital interface. V4 sensors
can be identified by the alpha-numeric traceability code on
the sensor cap – see example “B2G” code on Figure 1.
Evaluation Kits
0.46
1.27
5.08
0.2
2.0
Figure 1: Drawing of SHT7x (applies to SHT71 and SHT75)
sensor packaging, dimensions in mm (1mm = 0.039inch).
Contact assignment: 1: SCK, 2: VDD, 3: GND, 4: DATA.
Hatched item on backside of PCB is a 100nF capacitor – see
Section 2.1 for more information.
www.sensirion.com
For sensor trial measurements, for qualification of the
sensor or even experimental application of the sensor
there is an evaluation kit EK-H2 available including sensor,
hard and software to interface with a computer.
For more sophisticated and demanding measurements a
multi port evaluation kit EK-H3 is available which allows for
parallel application of up to 20 sensors.
Version 4.1 –September 2008
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