www.sensirion.com Version 0.1 – August 2017 1/14
Preliminary Datasheet SDP33
Digital Differential Pressure Sensor
Extended range to 1500Pa
Calibrated and temperature compensated
Excellent repeatability, no drift, no offset
Reflow solderable – Pick & Place
Extended feature set – smart averaging
Product Summary
The SDP3x sensor family is Sensirion’s series of small differential pressure sensors designed for high-volume applications
where size is a key requirement. It builds on the next generation CMOSens® sensor chip that is at the heart of Sensirion’s
new differential pressure and flow sensing platform.
The digital SDP33 sensor features an extended range to 1500Pa, fast measurement speed, excellent accuracy and long-term
stability and has no zero-point drift. Furthermore, it is reflow solderable and provides advanced functionality, such as smart
averaging, multiple temperature compensation modes, configurable I2C address and interrupts.
Benefits of Sensirion’s CMOSens® Technology
High reliability and long-term stability
Best signal-to-noise ratio
Industry-proven technology with a track record of more
than 15 years
Designed for mass production
High process capability
Content
1. Sensor Performance .............................................................. 2
2. Specifications ......................................................................... 3
3. Pin Assignment ...................................................................... 4
4. Measurement Modes ............................................................. 5
5. Digital Interface Description ................................................... 6
6. Package Outline................................................................... 11
7. Soldering .............................................................................. 12
8. Shipping Package ................................................................ 13
9. Ordering Information ............................................................ 13
Revision History ............................................................................ 13
Important Notices ......................................................................... 14
Headquarters and Subsidiaries .................................................... 14
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1. Sensor Performance
1.1 Differential Pressure Specification
1
Parameter
SDP33
Measurement range 2
- 1500 to + 1500 Pa
(-6 to 6 inches H2O)
Zero point accuracy 3,4
0.2 Pa
Span accuracy 3,4
3% of reading (- 500 to + 500 Pa)
6% of reading (- 1500 to + 1500 Pa)
Zero point repeatability 4
0.1 Pa
Span repeatability 4
0.5% of reading (- 500 to + 500 Pa)
3% of reading (- 1500 to + 1500 Pa)
Span shift due to
temperature variation
< 1% of reading per 10°C
Offset stability
< 0.03 Pa/year
Flow step response time (τ63)
< 3ms
Resolution
16 bit
Calibrated for
Air, N2
Media compatibility
Air, N2, O2, non-condensing
Calibrated temperature
range
-40 °C to +85 °C
1.2 Temperature Specification
5
Parameter
Value
Measurement range
- 40 °C to +85 °C
Resolution
16 bit
Accuracy
2 °C (-10 °C to +60 °C)
3 °C (-40 °C to +85 °C)
Repeatability
0.1°C
1
Unless otherwise noted, all sensor specifications are valid at 25°C with VDD = 3.3 V and absolute pressure = 966 mbar.
2
For other pressure ranges refer to the SDP3x-Digital datasheet
3
Includes repeatability
4
Total accuracy/repeatability is a sum of zero-point and span accuracy/repeatability.
5
The measured temperature is the temperature of the bulk silicon in the sensor. This temperature value is not only depending on the gas temperature, but
also on the sensor’s surroundings. Using the signal to measure solely the gas temperature will need special precautions, such as isolating the sensor from
external temperature influences.
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2. Specifications
2.1 Electrical Specifications
Parameter
Symbol
Condition
Min.
Typ.
Max.
Units
Comments
Supply Voltage
VDD
3.0
3.3
5.5
V
Power-up/down level
VPOR
2.3
2.5
2.7
V
Supply current
IDD
Measuring
3.8
5.5
mA
Idle state
1.1
mA
Sleep mode
1
uA
IRQn driving strength
4
mA
2.2 Timing Specifications
Parameter
Symbol
Condition
Min.
Typ.
Max.
Units
Comments
Power-up time
tPU
25
ms
Time to sensor ready
Soft reset time
tSR
20
ms
Time between soft
reset command and
sensor ready
I2C SCL frequency
fI2C
400
1000
kHz
Update rate differential
pressure value
Continuous mode
1800
2000
2200
Hz
Update rate
temperature value
Continuous mode
112.5
Hz
Temperature value is
updated at least every
16 pressure values
Measurement time
Triggered mode
40
45
50
ms
2.3 Mechanical Specifications
Parameter
Symbol
Condition
Min.
Typ.
Max.
Units
Comments
Allowable overpressure1
Pmax
1
bar
Rated burst pressure
Pburst
3
bar
Weight
W
0.2
g
2.4 Materials
Parameter
Wetted materials
Glass (silicon nitride, silicon oxide), LCP, green epoxy-based mold compound, epoxy-based resins
REACH, RoHS
REACH and RoHS compliant
2.5 Absolute Maximum Ratings
Parameter
Rating
Units
Supply Voltage VDD
-0.3 to 5.5
V
Max Voltage on pins SDA, SCL, IRQn
-0.3 to VDD+0.3
V
Input current on any pin
±70
mA
Operating temperature range2
-40 to +85
°C
Storage temperature range3
-40 to +85
°C
Max. humidity for long term exposure
40°C dew point
ESD HBM (human body model)
2
kV
1
Allowable overpressure during operation. Refer to the SDP selection guide for pressure dependency of the measured signal. Fast absolute pressure
changes on both ports can result in dynamic effects on the sensor signal. For higher overpressures or continuous high overpressures contact Sensirion.
2
For Air and N2. Long term exposure to high temperatures and (high concentrations of) O2 can reduce the product lifetime
3
For long term storage in Tape and Reel, refer to the SDP3x handling instructions
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3. Pin Assignment
The SDP3x consists of a QFN package with a plastic cap covering the top and providing the pneumatic connections to the
sensor. The pin assignments of the SDP33 can be found in Table 1.
Pin no.
Name
Description
1
GND
Connect to ground
2
GND
Connect to ground
3
GND
Connect to ground
4
IRQn
Interrupt output. Active low. Keep
floating when not used.
5
SCL
Serial Clock (I2C Interface)
6
GND
Connect to ground
7
VDD
VDD Supply
8
SDA
Bidirectional Serial Data (I2C Interface)
9
ADDR
I2C Address selection input.
10
GND
Connect to ground
11
GND
Connect to ground
12-16
-
Reserved. Do not connect
Table 1: SDP33 pin assignment (bottom view).
3.1 Power Pins (VDD, GND)
The power supply pins must be decoupled with a 100 nF capacitor that shall be placed as close to the sensor as possible.
3.2 Serial Clock and Serial Data (SCL, SDA)
The SCL and SDA are bidirectional pins of the I2C slave interface. The SCL is the Serial Clock pin and the SDA is the Serial
Data pin. For more details about the I2C interface refer to section 5.
3.3 ADDR Pin
The SDP33 supports different I2C addresses. With the ADDR pin an address can be selected. Connecting the ADDR pin to
GND selects the default address. Other I2C addresses can be selected with a resistor connected to GND. The maximum
tolerance for the resistor is ±5%. Do not connect the ADDR pin to VDD.
I2C Address (Hex)
Condition
0x21
ADDR connected to GND
0x22
ADDR connected with 1.2kOhm to GND
0x23
ADDR connected with 2.7kOhm to GND
3.4 IRQn Pin
The IRQn pin indicates whether new measurement results are available. The signal is active low, meaning that when the
signal is high there is no new measurement data available. The IRQn will automatically clear to high when a differential
pressure value is read out. The IRQn pin will also be set to low after every soft reset or Power on Reset, until a measurement
command is sent.
When the IRQn signal is not used, the pin should stay unconnected and must not be connected to GND or VDD.
3.5 Die Pad (Center Pad)
The die pad or center pad is visible from below and located in the center of the package. It is internally connected to GND and
therefore there are no electrical constraints on connecting or not connecting the die pad to GND. For mechanical stability it is
recommended to solder the center pad to the PCB.
The hole in the middle of the die pad must stay open during soldering.
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4. Measurement Modes
The SDP33 is a highly versatile differential pressure sensor and is very flexible regarding the measurement speed. This
flexibility not only allows for optimizing the sensor’s performance to a specific application, but also for adapting the sensor to
different use cases. For example, in one use case the sensor is detecting the smallest and quickest changes, whereas at
another time the sensor can measure in larger intervals while consuming only little energy.
4.1 Continuous Mode vs Triggered Mode
In continuous mode the sensor is measuring at the highest speed and writes the measurement values to the I2C results buffer,
where the I2C master can read out the value when it requires.
In triggered mode the sensor is default in an idle state and wakes up when the command is sent. It then powers up the heater
and does a measurement. During this time the sensor doesn’t acknowledge any I2C read header or stretches the clock. When
the measurement is finished the sensor returns to the idle state and makes the measurement result available to be read out.
For more details see chapter 5.3.3.
Continuous mode
Triggered mode
Description
Measures continuously
Measures once after command is sent
Measurement speed and
rate
Measurement result can be read out
continuously and at any time, but not faster
than 0.5ms.
Measurement result is available within +/-
45ms after command.
Clock stretching is available.
Measurement method
Sensor configuration is optimized for speed
and accuracy.
Sensor configuration is optimized for low
power consumption.
Recommended use
Best used where speed and accuracy are
most important.
Best used where energy consumption is
more important than speed.
4.2 Continuous Mode and ‘Average till Read’
In continuous measurement modes a new measurement result is available every 0.5ms. A new value can be read out every
0.5ms and the IRQn will go low when a new measurement result is available.
If the ‘average till read’ option is chosen, the sensor averages all values (xi) prior to the read out. This has the benefit that the
user can read out the sensor at its own desired speed, without losing information and thus prevents aliasing. During the first
25 ms of averaging the averaged value is obtained as the arithmetic mean.
When the reading speed is even slower than 25 ms, the sensor will continue to average, but with another algorithm. In this
algorithm exponential smoothing is used, with a smoothing factor = 0.05.
Where S0 is the arithmetic value after the first 25 ms.
Please refer to relevant literature for more information about exponential smoothing.
4.3 Temperature Compensation Modes and Absolute Pressure Dependency
The SDP3x is temperature compensated both for differential pressure and for mass flow compensated differential pressure. In
use cases where the SDP3x is used to measure mass flow it is advised to use mass flow temperature compensation. In this
case no absolute pressure compensation is required.
For more information about temperature and absolute pressure compensation for differential pressure sensors, for example
volume flow measurements in bypass, refer to the selection guide in the differential pressure download center on our website.
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5. Digital Interface Description
The SDP33 interface is compatible with the I2C protocol. This chapter describes the command set for SDP33. For detailed
information about the I2C protocol, please check the document "NXP I2C-bus specification and user manual".
5.1 I2C Address
The I2C address for SDP33 can be selected with the ADDR pin. For more information refer to section 3.3.
5.2 I2C Sequences
The commands are 16-bit. Data is read from the sensor in multiples of 16-bit words, each followed by an 8-bit checksum to
ensure communication reliability.
I2C master writes 16 bit command
I2C master sends read header and receives multiple 16bit words with CRC byte.
Dark areas with white text indicate that the sensor controls the SDA (Data) line.
I2C sequences can be aborted with a NACK and STOP condition.
5.3 I2C Commands
The command set of the SDP33 consists of a set of different commands:
- Continuous measurement
o Start Continuous measurement commands
o Stop measurement command
- Triggered measurement commands
- Soft reset
- Entering and exiting sleep mode
- Read product identifier and serial number
S
W
ACK
I2CAdr[6:0]
Cmd[15:8]
ACK
Cmd[7:0]
ACK
S
R
ACK
I2CAdr[6:0]
Data1[15:8]
ACK
Data1[7:0]
ACK
CRC1[7:0]
ACK
P
Data2[15:8]
ACK
Data2[7:0]
ACK
CRC2[7:0]
ACK
P
or
DataX[15:8]
ACK
DataX[7:0]
ACK
CRCX[7:0]
ACK
P
or
≈
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5.3.1 Start Continuous Measurement
The sensor measures both the differential pressure and temperature. Both measurement results can be read out through one
single I2C read header.
Continuous measurements can be started up in different configurations by a set of commands.
Command code (Hex)
Temperature compensation
Averaging
0x3603
Mass flow
Average till read
0x3608
Mass flow
None - Update rate 0.5ms
0x3615
Differential pressure
Average till read
0x361E
Differential pressure
None - Update rate 0.5ms
After one of the commands has been sent, the chip continuously measures and updates the measurement results. New
results can be read continuously with only an I2C read header. (Measurement) commands must not be sent until the stop
measurement command has been sent.
After the start measurement command is sent:
- the first measurement result is available after 8ms;.
- small accuracy deviations (few % of reading) can occur during the next 12ms.
When no measurement data is yet available the sensor will respond with a NACK to the I2C read header (I2C address + read
bit).
Preceding
command
Consecutive read
Description
continuous
measurement
Byte1: Differential Pressure 8msb
Byte2: Differential Pressure 8lsb
Byte3: CRC
Byte4: Temperature 8msb
Byte5: Temperature 8lsb
Byte6: CRC
Byte7: Scale Factor differential pressure 8msb
Byte8: Scale Factor differential pressure 8lsb
Byte9: CRC
After a start continuous measurement
commands, the measurement results can be
read out.
The temperature and scale factor don’t need to
be read out (every time). The read sequence
can be aborted by a NACK and a STOP
condition.
5.3.2 Stop Continuous Measurement
Command
Command code (Hex)
Description
Stop continuous
measurement
0x3FF9
This command stops the continuous
measurement and puts the sensor in idle mode.
It powers off the heater and makes the sensor
receptive for another command after 500us.
The Stop command is also required when
switching between different continuous
measurement commands.
When the sensor is in continuous measurement mode, the sensor must be stopped before it can accept another command.
The only exception is the soft reset command as described in section 5.3.4.
In idle mode the sensor will consume less power, but consider the sleep mode for most effective energy saving.
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5.3.3 Triggered Measurement
During a triggered measurement the sensor measures both differential pressure and temperature. The measurement starts
directly after the command has been sent. The command needs to be repeated with every measurement.
Command code (Hex)
Temperature compensation
Clock stretching
0x3624
Mass flow
0x3726
Mass flow
Yes
0x362F
Differential pressure
0x372D
Differential pressure
Yes
During the 45ms that the sensor is measuring, no command can be sent to the sensor. After the 45ms the result can be read
out and any command can be sent to the sensor.
Monitoring whether or not the sensor is ready with its measurement can be done with the following methods.
Method
Available
Description
Clock stretching
Only for clock
stretching commands
The sensor starts the measurement after the triggered measurement
command with clock stretching. When an I2C read header is sent within
45ms the sensor performs clock stretching after acknowledging the
read header.
When the sensor has finished the measurement, it makes the result
available by releasing the SCL.
Polling
Only for non-clock
stretching commands
In this mode the sensor does not acknowledge (NACK) an I2C read
header as long as no measurement result is available.
IRQn
Always
The IRQn is always available to monitor whether the sensor is ready
with the measurement. When the IRQn is low, the sensor indicates that
a new measurement result can be read out. The IRQn is self-clearing
when the result is read-out.
When new measurement data is available it can be read out by sending an I2C read header and reading out the data from the
sensor. In the table below the data layout of the results can be found.
Preceding
command
Consecutive read
Description
Triggered
measurement
Byte1: Differential Pressure 8msb
Byte2: Differential Pressure 8lsb
Byte3: CRC
Byte4: Temperature 8msb
Byte5: Temperature 8lsb
Byte6: CRC
Byte7: Scale Factor differential pressure 8msb
Byte8: Scale Factor differential pressure 8lsb
Byte9: CRC
After a triggered measurement command, the
results can be read out when the sensor is
finished with the measurement.
The temperature and scale factor don’t need to
be read out (every time). The read sequence
can be aborted by a NACK and a STOP
condition.
5.3.4 Soft Reset
Command
I2C address + W bit +
command code (Hex)
Consecutive
read
Description
General call
reset
0x0006
NA
This sequence resets the sensor with a separate reset block,
which is as much as possible detached from the rest of the
system on chip.
Note that the I2C address is 0x00, which is the general call
address, and that the command is 8 bit. The reset is
implemented according to the I2C specification.
After the reset command the sensor will take maximum 20ms to reset. During this time the sensor will not acknowledge its
address nor accept commands.
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5.3.5 Entering and Exiting Sleep Mode
In sleep mode the sensor uses the minimum amount of current. The mode can only be entered from idle mode, i.e. when the
sensor is not measuring.
This mode is particularly useful for battery operated devices. To minimize the current in this mode, the complexity of the sleep
mode circuit has been reduced as much as possible, which is mainly reflected by the way the sensor exits the sleep mode.
In sleep mode the sensor cannot be soft reset.
Command
Command code
(Hex)
Consecutive
read
Description
Enter Sleep mode
0x3677
NA
Triggered mode: the sleep command can be sent after the
result have been read out and the sensor is in idle mode.
Continuous mode: the sleep command can be sent after a
stop continuous measurement command has been issued
and is in idle mode.
Exit Sleep mode
NA
NA
The sensor exits the sleep mode and enters the idle mode
when it receives the valid I2C address and a write bit (‘0’).
Note that the I2C address is not acknowledged. It is
necessary to poll the sensor to see whether the sensor has
received the address and has woken up. This should take
maximum 2ms.
5.3.6 Read Product Identifier
During assembly and start-up of the machine it might be required to check some basic parameters in the sensor - for example
to check if the correct sensor is integrated.
The product identifier and serial number can be read out after sending a sequence of two commands.
Command
Command code
Consecutive read
Description
Read product
identifier
0x367C
0xE102
Byte1: Product number [31:24]
Byte2: Product number [23:16]
Byte3: CRC
Byte4: Product number [15:8]
Byte5: Product number [7:0]
Byte6: CRC
Byte7: Serial number [63:56]
Byte8: Serial number [55:48]
Byte9: CRC
Byte10: Serial number [47:40]
Byte11: Serial number [39:32]
Byte12: CRC
Byte13: Serial number [31:24]
Byte14: Serial number [23:16]
Byte15: CRC
Byte16: Serial number [15:8]
Byte17: Serial number [7:0]
Byte18: CRC
Note that both commands need to be preceded
with an I2C write header (I2C address + W).
The second command returns:
- 32 bit unique product and revision
number. The number is listed in the
table below.
Note that the last 8 bits are the revision
number and are subject to change as
long as the datasheet is preliminary.
- 64 bit unique serial number
Product
Product number
SDP33
0x03010384
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5.4 Checksum Calculation
The checksum byte is generated by a CRC algorithm with the following properties:
Property
Value
Name
CRC-8
Protected data
read data
Width
8 bit
Polynomial
0x31 (x8 + x5 + x4 +1)
Initialization
0xFF
Reflect input
False
Reflect output
False
Final XOR
0x00
Example
CRC(0xBEEF) = 0x92
5.5 Conversion to Physical Values
Conversion of the differential pressure and temperature sensor signals to a physical value is done with the scale factor.
5.5.1 Scale Factors
Parameter
SDP33
Differential Pressure
20 Pa-1
Temperature
200 °C-1
5.5.2 Differential Pressure
The digital calibrated differential pressure signal read from the sensor is a signed integer number (two's complement number).
The integer value can be converted to the physical value by dividing it by the scale factor (differential pressure in Pascal =
sensor output scale factor).
5.5.3 Temperature
The digital calibrated temperature signal read from the sensor is a signed integer number (two's complement number). The
integer value can be converted to the physical value by dividing it by the scale factor (temperature in °C = sensor output
scale factor).
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7. Soldering
Recommended land pattern
The solder mask is understood to be the insulating layer on top of the PCB covering the copper traces. It is recommended to
design the land pattern as a Non- Solder Mask Defined (NSMD) type.
Recommended stencil aperture
The sensor must enter the reflow process only once, with a minimal temperature and exposure time. When both sides of the
PCB are reflow soldered or multiple reflow runs are required, the sensor must be soldered in the last soldering run. In any
case the temperature should not exceed 260°C; temperatures above 200°C should be limited in time to a maximum of 150
seconds.
Ensure that the ports of the sensor are well protected during assembly and soldering so that no dust, solder flux or other
liquids can enter the flow channel. In no case, a board wash shall be applied. Therefore it is strongly recommended to use “no-
clean” solder paste.
It is important to note that the diced edge or side faces of the I/O pads may oxidize over time, therefore a solder fillet may or
may not form. Hence there is no guarantee for solder joint fillet heights of any kind.
Refer to the SDP3x handling instructions on our website for more details.
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8. Shipping Package
SDP33 is provided in tape & reel shipment packaging. Standard packaging size is 250 units per reel. The drawing of the
packaging tapes with sensor orientation is shown in Figure 2.
Figure 2: Sketch of packaging tape and sensor orientation. Header tape is to the right and trailer tape to the left on this sketch
9. Ordering Information
Use the part names and product numbers shown in the following table when ordering the SDP33 differential pressure sensor.
For the latest product information and local distributors, visit www.sensirion.com.
Part name
Description / Output
Product number
Packaging
Tape & Reel size
SDP33
I2C, 1500Pa
1-101636-02
Tape & Reel (QFN Quad 2 configuration)
250
Revision History
Date
Author
Version
Changes
24.08.2017
ANB
V0.1
First Draft
www.sensirion.com Version 0.1 – August 2017 14/14
Important Notices
Warning, personal injury
Do not use this product as safety or emergency stop devices or in
any other application where failure of the product could result in
personal injury (including death). Do not use this product for
applications other than its intended and authorized use. Before
installing, handling, using or servicing this product, please
consult the datasheet and application notes. Failure to comply
with these instructions could result in death or serious injury.
If the Buyer shall purchase or use SENSIRION products for any
unintended or unauthorized application, Buyer shall defend, indemnify
and hold harmless SENSIRION and its officers, employees,
subsidiaries, affiliates and distributors against all claims, costs,
damages and expenses, and reasonable attorney fees arising out of,
directly or indirectly, any claim of personal injury or death associated
with such unintended or unauthorized use, even if SENSIRION shall be
allegedly negligent with respect to the design or the manufacture of the
product.
ESD Precautions
The inherent design of this component causes it to be sensitive to
electrostatic discharge (ESD). To prevent ESD-induced damage and/or
degradation, take customary and statutory ESD precautions when
handling this product.
See application note “Handling Instructions” for more information.
Warranty
SENSIRION warrants solely to the original purchaser of this product for
a period of 12 months (one year) from the date of delivery that this
product shall be of the quality, material and workmanship defined in
SENSIRION’s published specifications of the product. Within such
period, if proven to be defective, SENSIRION shall repair and/or
replace this product, in SENSIRION’s discretion, free of charge to the
Buyer, provided that:
notice in writing describing the defects shall be given to
SENSIRION within fourteen (14) days after their appearance;
such defects shall be found, to SENSIRION’s reasonable
satisfaction, to have arisen from SENSIRION’s faulty design,
material, or workmanship;
the defective product shall be returned to SENSIRION’s factory at
the Buyer’s expense; and
the warranty period for any repaired or replaced product shall be
limited to the unexpired portion of the original period.
This warranty does not apply to any equipment which has not been
installed and used within the specifications recommended by
SENSIRION for the intended and proper use of the equipment.
EXCEPT FOR THE WARRANTIES EXPRESSLY SET FORTH
HEREIN, SENSIRION MAKES NO WARRANTIES, EITHER EXPRESS
OR IMPLIED, WITH RESPECT TO THE PRODUCT. ANY AND ALL
WARRANTIES, INCLUDING WITHOUT LIMITATION, WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, ARE EXPRESSLY EXCLUDED AND DECLINED.
SENSIRION is only liable for defects of this product arising under the
conditions of operation provided for in the datasheet and proper use of
the goods. SENSIRION explicitly disclaims all warranties, express or
implied, for any period during which the goods are operated or stored
not in accordance with the technical specifications.
SENSIRION does not assume any liability arising out of any application
or use of any product or circuit and specifically disclaims any and all
liability, including without limitation consequential or incidental damages.
All operating parameters, including without limitation recommended
parameters, must be validated for each customer’s applications by
customer’s technical experts. Recommended parameters can and do
vary in different applications.
SENSIRION reserves the right, without further notice, (i) to change the
product specifications and/or the information in this document and (ii) to
improve reliability, functions and design of this product.
Copyright © 2017, SENSIRION.
CMOSens® is a trademark of Sensirion
All rights reserved
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Switzerland
phone: +41 44 306 40 00
fax: +41 44 306 40 30
info@sensirion.com
www.sensirion.com
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phone: +1 312 690 5858
info-us@sensirion.com
www.sensirion.com
Sensirion Korea Co. Ltd.
phone: +82 31 337 7700~3
info-kr@sensirion.com
www.sensirion.co.kr
Sensirion Japan Co. Ltd.
phone: +81 3 3444 4940
info-jp@sensirion.com
www.sensirion.co.jp
Sensirion China Co. Ltd.
phone: +86 755 8252 1501
info-cn@sensirion.com
www.sensirion.com.cn
Sensirion Taiwan Co. Ltd
phone: +886 3 5506701
info@sensirion.com
www.sensirion.com
To find your local representative, please visit www.sensirion.com/distributors
