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PDF STS21 Data sheet ( Hoja de datos )
| Número de pieza | STS21 | |
| Descripción | Temperature Sensor IC | |
| Fabricantes | Sensirion | |
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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
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
1 page  
Datasheet STS21
consists of fully static logic there is no minimum SCL
frequency.
3.3 Serial SDA (SDA)
The SDA pin is used to transfer data in and out of the
sensor. For sending a command to the sensor, SDA is
valid on the rising edge of SCL and must remain stable
while SCL is high. After the falling edge of SCL the SDA
value may be changed. For safe communication SDA shall
be valid tSU and tHD before the rising and after the falling
edge of SCL, respectively – see Figure 9. For reading data
from the sensor, SDA is valid tVD after SCL has gone low
and remains valid until the next falling edge of SCL.
VDD
MCU (master)
SCL IN
SCL OUT
SDA IN
SDA OUT
RP RP
SCL
SDA
STS21
(slave)
GND
Figure 8 Typical application circuit, including pull-up resistors
RP and decoupling of VDD and VSS by a capacitor.
To avoid signal contention the micro-controller unit (MCU)
must only drive SDA and SCL low. External pull-up
resistors (e.g. 10kΩ), are required to pull the signal high.
For the choice of resistor size please take bus capacity
requirements into account (compare Table 5). It should be
noted that pull-up resistors may be included in I/O circuits
of MCUs. See Table 4 and Table 5 for detailed I/O
characteristic of the sensor.
4 Electrical Characteristics
4.1 Absolute Maximum Ratings
The electrical characteristics of STS21 are defined in
Table 1. The absolute maximum ratings as given in Table
3 are stress ratings only and give additional information.
Functional operation of the device at these conditions is
not implied. Exposure to absolute maximum rating
conditions for extended periods may affect the sensor
reliability (e.g. hot carrier degradation, oxide breakdown).
Parameter
VDD to VSS
Digital I/O Pins (SDA, SCL)
to VSS
Input Current on any Pin
min
-0.3
-0.3
-100
max
5
VDD + 0.3
100
Units
V
V
mA
Table 3 Electrical absolute maximum ratings
ESD immunity is qualified according to JEDEC JESD22-
A114 method (Human Body Model at 4kV), JEDEC
JESD22-A115 method (Machine Model 200V) and ESDA
ESD-STM5.3.1-1999 and AEC-Q100-011 (Charged
Device Model, 750V corner pins, 500V other pins). Latch-
up immunity is provided at a force current of 100mA with
Tamb = 125°C according to JEDEC JESD78. For exposure
beyond named limits the sensor needs additional
protection circuit.
4.2 Input / Output Characteristics
The electrical characteristics such as power consumption,
low and high level input and output voltages depend on
the supply voltage. For proper communication with the
sensor it is essential to make sure that signal design is
strictly within the limits given in Table 4 & 5 and Figure 9.
Parameter
Output Low
Voltage, VOL
Output High
Voltage, VOH
Output Sink
Current, IOL
Input Low
Voltage, VIL
Input High
Voltage, VIH
Input Current
Conditions min typ max Units
VDD = 3.0 V,
-4 mA < IOL < 0mA
0
- 0.4 V
70%
VDD
-
VDD
V
- - -4 mA
0
-
30%
VDD
V
70%
VDD
-
VDD
V
VDD = 3.6 V,
VIN = 0 V to 3.6 V
-
- ±1 uA
Table 4 DC characteristics of digital input/output pads. VDD =
2.1V to 3.6V, T = -40°C to 125°C, unless otherwise noted.
SCL
tSCLH
1/fSCL
tSCLL
tR
tF
tSU
DATA IN
SDA
DATA OUT
SDA
SDA valid write
tHD
SDA valid read
tVD tF
70%
30%
70%
30%
tR
70%
30%
Figure 9 Timing Diagram for Digital Input/Output Pads,
abbreviations are explained in Table 5. SDA directions are seen
from the sensor. Bold SDA line is controlled by the sensor, plain
SDA line is controlled by the micro-controller. Note that SDA
valid read time is triggered by falling edge of anterior toggle.
www.sensirion.com
Version 2 – December 2011
5/12
5 Page 
Datasheet STS21
Revision History
Date
April 2011
10 June 2011
15 July 2011
December 2011
Version
0.3
0.4
1
2
Page(s)
all
2
-
1, 2, 4, 6-8
Changes
New preliminary release (based on SHT21 data sheet)
Quantity of 5000 pcs. added to packaging information
Initial Release
Average power dissipation value, tolerance of threshold value for low battery signal,
minor text adaptations and corrections.
www.sensirion.com
Version 2 – December 2011
11/12
11 Page | ||
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| PDF Descargar | [ Datasheet STS21.PDF ] | |
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