SHT25_15 Datasheet, PDF (1/14 Pages) List of Unclassifed Manufacturers – Humidity and Temperature Sensor IC

Datasheet SHT25
Humidity and Temperature Sensor IC
 Fully calibrated with 1.8%RH accuracy
 Digital output, I²C interface
 Low power consumption
 Excellent long term stability
 DFN type package – reflow solderable
Product Summary
The SHT25 high accuracy humidity and temperature
sensor of Sensirion has become an industry standard in
terms of form factor and intelligence: Embedded in a
reflow solderable Dual Flat No leads (DFN) package of 3
x 3mm foot print and 1.1mm height it provides calibrated,
linearized sensor signals in digital, I²C format.
The SHT2x sensors contain a capacitive type humidity
sensor, a band gap temperature sensor and specialized
analog and digital integrated circuit – all on a single
CMOSens^® chip. This yields in an unmatched sensor
performance in terms of accuracy and stability as well as
minimal power consumption.
Every sensor is individually calibrated and tested. Lot
identification is printed on the sensor and an electronic
identification code is stored on the chip – which can be
read out by command. Furthermore, the resolution of
SHT2x can be changed by command (8/12bit up to
12/14bit for RH/T) and a checksum helps to improve
communication reliability.
With this set of features and the proven reliability and
long-term stability, the SHT2x sensors offer an
outstanding performance-to-price ratio. For testing SHT2x
two evaluation kits EK-H4 and EK-H5 are available.
Dimensions
3.0
0.3 typ
1.4 max
2.2
0.4 0.3
1.1
Bottom
View
NC VDD SCL
Sensor Chip
SHT25 features a generation 4C CMOSens® chip.
Besides the capacitive relative humidity sensor and the
band gap temperature sensor, the chip contains an
amplifier, A/D converter, OTP memory and a digital
processing unit.
Material Contents
While the sensor itself is made of Silicon the sensors’
housing consists of a plated Cu lead-frame and green
epoxy-based mold compound. The device is fully RoHS
and WEEE compliant, e.g. free of Pb, Cd and Hg.
2.4
1.0 1.0
NC VSS SDA
Figure 1: Drawing of SHT25 sensor package, dimensions are
given in mm (1mm = 0.039inch), tolerances are ±0.1mm. The
die pad (center pad) is internally connected to VSS. The NC
pads must be left floating. VSS = GND, SDA = DATA.
Numbering of E/O pads starts at lower right corner (indicated by
notch in die pad) and goes clockwise (compare Table 2).
Additional Information and Evaluation Kits
Additional information such as Application Notes is
available from the web page www.sensirion.com/sht25.
For more information please contact Sensirion via
[e-mail].
For SHT25 two Evaluation Kits are available: EK-H4, a
four-channel device with Viewer Software, that also serves
for data-logging, and a simple EK-H5 directly connecting
one sensor via USB port to a computer.
www.sensirion.com
Version 3 – May 2014
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