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Sensirion

STS21 Datasheet Preview

STS21 Datasheet

Temperature Sensor IC

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Datasheet STS21
Temperature Sensor IC
Fully calibrated
Digital output, I2C interface
Low power consumption
Excellent long term stability
DFN type package reflow solderable
Product Summary
STS21, the new temperature sensor of Sensirion is about
to set new standards in terms of size 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 signals in digital, I2C
format.
Using the same CMOSens® technology as Sensirion‟s
successful and industry proven SHT2x humidity and
temperature sensors, the STS21 offers superior
performance and reliability. The ±0.2°C temperature
specification allows for implementation of the STS21 in
applications with high demands on temperature accuracy.
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
STS21 can be changed by command (11bit up to 14bit),
low battery can be detected and a checksum helps to
improve communication reliability.
With made improvements and the miniaturization of the
sensor the performance-to-price ratio has been improved
and eventually, any device should benefit from the
cutting edge energy saving operation mode.
Dimensions
3.0
0.3 typ
Sensor Chip
STS21 features a generation 4C CMOSens® chip.
Besides the band gap temperature sensor, the chip
contains an amplifier, A/D converter, OTP memory and a
digital processing unit.
0.8 typ
2.2
0.4 0.3
2.4
1.1
Bottom View
NC VDD SCL
1.0 1.0
NC VSS SDA
Figure 1 Drawing of STS21 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).
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.
Additional Information and Evaluation Kits
Additional information such as Application Notes is
available from the web page www.sensirion.com. For more
information please contact Sensirion via
info@sensirion.com.
For STS21 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 2 December 2011
1/12




Sensirion

STS21 Datasheet Preview

STS21 Datasheet

Temperature Sensor IC

No Preview Available !

Sensor Performance
Temperature Specification
Parameter
Resolution1
Accuracy
tolerance2
Repeatability
Operating Range
Response Time3
Long Term Drift
Condition
14 bit
12 bit
typ
max
extended
63%
min typ max
0.01
0.04
0.2
see Figure 2
0.1
-40 125
5 30
< 0.04
Units
°C
°C
°C
°C
°C
°C
s
°C/yr
T (°C)
± 2.0
± 1.5
maximal tolerance
typical tolerance
± 1.0
± 0.5
± 0.0
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Figure 2 Typical and maximal tolerance for temperature sensor
in °C
Electrical Specification
Parameter
Conditions min typ max Units
Supply Voltage, VDD
2.1 3.0 3.6 V
Supply Current, IDD4 sleep mode
measuring
0.15 0.4 µA
200 300 330 µA
sleep mode
0.5 1.2 µW
Power Dissipation4 measuring 0.6 0.9 1.0 mW
average 11bit
8.6
µW
Communication
digital 2-wire interface, I2C protocol
Table 1 Electrical specification. For absolute maximum
values see Section 4.1 of Users Guide.
Packaging Information
Sensor Type
STS21
Packaging
Tape & Reel
Tape & Reel
Tape & Reel
Quantity
400
1500
5000
Order Number
1-100811-01
1-100812-01
1-100832-01
1 Default measurement resolution is 14bit. It can be reduced to 13bit, 12bit or
11bit by command to user register.
2 Accuracies are tested at Outgoing Quality Control at 25°C and 3.0V. Values
exclude long term drift.
3 Response time depends on heat conductivity of sensor substrate.
This datasheet is subject to change and may be amended
without prior notice.
4 Min and max values of Supply Current and Power Dissipation are based on
fixed VDD = 3.0V and T<60°C. The average value is based on one 11bit
measurement per second.
www.sensirion.com
Version 2 December 2011
2/12


Part Number STS21
Description Temperature Sensor IC
Maker Sensirion
Total Page 12 Pages
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