SDP801-500PA [ETC]

Digital Differential Pressure Sensor Excellent repeatability, no drift, no offset;


型号：	SDP801-500PA
厂家：	ETC
描述：	Digital Differential Pressure Sensor Excellent repeatability, no drift, no offset 传感器换能器
文件：	总14页 (文件大小：715K)
中文：	中文翻译
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Datasheet SDP8xx-Digital

Digital Differential Pressure Sensor

. Excellent repeatability, no drift, no offset

. Extended feature set – smart averaging

. Calibrated and temperature compensated

Product Summary

The SDP800 sensor family is Sensirion’s series of digital differential pressure sensors designed for high-volume applications.

The sensors measure the pressure of air and non-aggressive gases with superb accuracy and no offset drift. The sensors

cover a pressure range of up to ±500 Pa (±2 inch H₂O / ±5 mbar) and deliver outstanding accuracy, also at the bottom end of

the measuring range.

The SDP800 Series features a digital 2-wire I²C interface, which makes it easy to connect directly to a microprocessor.

The outstanding performance of these sensors is based on Sensirion’s patented CMOSens® sensor technology, which

combines the sensor element, signal processing and digital calibration on a small CMOS chip. The differential pressure is

measured by a thermal sensor element using flow-through technology. The well-proven CMOS technology is perfectly suited

for high-quality mass production and is the ideal choice for demanding and cost-sensitive OEM applications.

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. Ordering Information.............................................................. 2

2. Sensor Performance.............................................................. 2

3. Specifications......................................................................... 3

4. Pin Assignment...................................................................... 4

5. Measurement Modes ............................................................. 5

6. Digital Interface Description................................................... 6

7. Package Outline................................................................... 11

8. Soldering.............................................................................. 13

9. Shipping Package................................................................ 13

Revision History............................................................................ 13

Important Notices ......................................................................... 14

Headquarters and Subsidiaries .................................................... 14

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1. Ordering Information

Use the part name and order number shown in the following table when ordering SDP800 series differential pressure sensor.

Part name

Form Factor

Manifold mount

Range

I²C address

0x25

Shipping Package

Trays of 80 pieces

Order number

1-101551-01

3.000.142

SDP800-500Pa

SDP801-500Pa

SDP810-500Pa

SDP811-500Pa

SDP800-125Pa

SDP810-125Pa

500Pa - bidirectional

0x26

Tube connection 500Pa - bidirectional

0x25

1-101532-01

3.000.144

0x26

Manifold mount

125Pa - bidirectional

0x25

1-101599-01

1-101597-01

Tube connection 125Pa - bidirectional

0x25

2. Sensor Performance

2.1 Differential Pressure Specification¹

Parameter

SDP8xx-500Pa

SDP8xx-125Pa

Measurement range

-500 to 500 Pa

(-2 to 2 inH₂O)

-125 to 125 Pa

(-0.5 to 0.5 inH₂O)

Zero point accuracy ^2,3

Span accuracy ^2,3

Zero point repeatability ³

Span repeatability ³

0.1 Pa

3% of reading

0.05 Pa

0.08 Pa

3% of reading

0.04 Pa

0.5% of reading

Span shift due to temperature

< 0.5% of reading per 10°C

< 0.05 Pa/year

< 0.5% of reading per 10°C

< 0.05 Pa/year

variation

Offset stability

Flow step response time (τ₆₃)

Resolution

< 3ms

16 bit

Air, N₂

Calibrated for

Media compatibility

Temperature compensation range

Air, N_2,O₂, non-condensing

-20 °C to +85 °C

2.2 Temperature Specification⁴

Parameter

Measurement range

Resolution

Value

-40 °C to +85 °C

16 bit

2 °C (-10 °C to +60 °C)

3 °C (-40 °C to +85 °C)

Accuracy

Repeatability

0.1°C

Unless otherwise noted, all sensor specifications are valid at 25°C with VDD = 3.3 V and absolute pressure = 966 mbar.

Includes repeatability

Total accuracy/repeatability is a sum of zero-point and span accuracy/repeatability.

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 temperate influences.

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3. Specifications

3.1 Electrical Specifications

Parameter

Supply Voltage

Power-up/down level

Symbol

V_DD

V_POR

Condition

Min.

2.7

2.3

Typ.

Max.

5.5

2.7

5.5

1.1

Units

Comments

2.5

3.8

Measuring

Idle state

Sleep mode

Supply current

I_DD

3.2 Timing Specifications

Parameter

Power-up time

Symbol

Condition

Min.

Typ.

Max.

Units Comments

Time to sensor ready

t_PU

t_SR

f_I2C

Time between soft

reset command or exit

sleep mode and

sensor ready

Soft reset time

I2C SCL frequency

Update rate differential

pressure value

400

1000

2200

kHz

Continuous mode

1800

2000

Temperature value is

updated at least every

16 pressure values

Update rate

temperature value

Continuous mode

Triggered mode

112.5

Measurement time

3.3 Mechanical Specifications

Parameter

Symbol

P_max

P_burst

Condition

Min.

Typ.

Max.

Units

bar

Comments

Allowable overpressure

Rated burst pressure

Weight

3.4 Materials

Parameter

PBT (polybutylene terephthalate), glass (silicon nitride, silicon oxide), silicon, gold, FR4, silicone as static

sealing, epoxy, copper alloy, lead-free solder

Wetted materials

REACH, RoHS

REACH and RoHS compliant

3.5 Absolute Minimum and Maximum Ratings

Parameter

Supply Voltage V_DD

Rating

-0.3 to 5.5

-0.3 to V_DD+0.3

±70

-40 to +85

40°C dew point

Units

°C

Max Voltage on pins (SDA, SCL)

Input current on any pin

Operating temperature range¹

Storage temperature range

Max. humidity for long term exposure

ESD HBM (human body model)

For Air and N₂. Long term exposure to (high concentrations of) O₂at high temperatures can reduce the product lifetime

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4. Pin Assignment

The pin assignments of the SDP8xx-Digital can be found in Table 1

Pin no. Name Description

SCL

VDD

GND

SDA

Serial Clock (I²C Interface)

VDD Supply

Connect to ground

Bidirectional Serial Data (I²C Interface)

SDA

GND VDD

SCL

Table 1: SDP8xx-Digital pin assignment (bottom view).

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5. Measurement Modes

The SDP8xx-Digital 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 fastest changes, whereas at

another time the sensor can measure in larger intervals while consuming only little energy.

5.1 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

clock stretching is enabled. 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 6.3.3.

Continuous mode

Triggered mode

Description

Measures continuously

Measures once after command is sent

Measurement speed and Measurement result can be read out Measurement result is available in +/- 45ms

rate

continuously and at any time, but not faster after command.

than 0.5ms.

Clock stretching is available.

Measurement method

Sensor configuration is optimized for speed Sensor configuration is optimized for low

and accuracy.

Best used where speed and accuracy are Best used where energy consumption is

most important. more important than speed.

power consumption.

Recommended use

5.2 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.

If the ‘average till read’ option is chosen, the sensor averages all values (x_i) since last read out, or, when no read has occurred

yet, since last start measurement command. 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.

ꢀ

푥_푖

푥̅

= ∑

for 푡 < 25 ms

_푖ꢁ1푁

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 훼 = 0.05.

(

)

푆_푘= 훼 ∙ 푥_푖+ ꢂ − 훼 ∙ 푆_푘ꢃ1

푆₀= 푥ꢄ,

for 푡 > 25 ms

Where S₀is the arithmetic value after the first 25 ms.

Please refer to relevant literature for more information about exponential smoothing.

5.3 Temperature Compensation Modes and Absolute Pressure Dependency

The SDP8xx is temperature compensated both for differential pressure and for mass flow compensated differential pressure.

In use cases where the SDP8xx 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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6. Digital Interface Description

The SDP8xx-digital interface is compatible with the I²C protocol. This chapter describes the command set for SDP8xx-digital.

For detailed information about the I²C protocol, please check the document "NXP I²C-bus specification and user manual".

6.1 I²C Addresses

The following table lists the SDP8xx-digital product variants and its I²C addresses.

Product Variant

I²C address

SDP800-500Pa / SDP810-500Pa

SDP800-125Pa / SDP810-125Pa

SDP801-500Pa / SDP811-500Pa

0x25 (b 0100101)

0x26 (b 0100110)

The address is followed by a read or write bit.

6.2 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

I2CAdr[6:0]

Cmd[15:8]

Cmd[7:0]

I²C master sends read header and receives multiple 16bit words with CRC byte.

I2CAdr[6:0]

Data1[15:8]

Data1[7:0]

CRC1[7:0]

Data2[15:8]

DataX[15:8]

Data2[7:0]

DataX[7:0]

CRC2[7:0]

CRCX[7:0]

≈

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.

6.3 I²C Commands

The command set of the SDP8xx-digital consists of a set of different commands:

Continuous measurement

Start Continuous measurement commands

Stop measurement command

Triggered measurement commands

Soft reset

Entering and exiting sleep mode

Read product identifier and serial number

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6.3.1 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

0x3608

0x3615

0x361E

Mass flow

Differential pressure

Average till read

None - Update rate 0.5ms

Average till read

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.

The measurement command must only be sent once, if acknowledged. The command must not be resent or other commands

must not be sent until the stop measurement command has been issued.

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

continuous

measurement

Consecutive read

Description

After start continuous measurement

commands, the measurement results can be

read out.

Byte1: DP 8msb

Byte2: DP 8lsb

Byte3: CRC

Byte4: Temp 8msb

Byte5: Temp 8lsb

Byte6: CRC

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

Byte7: Scale Factor differential pressure 8msb condition.

Byte8: Scale Factor differential pressure 8lsb

Byte9: CRC

The scale factor is for differential pressure in

Pascal.

6.3.2 Stop Continuous Measurement

Command

Stop continuous

measurement

Command code (Hex)

0x3FF9

Description

This command stops the continuous

measurement and puts the sensor in idle mode.

It powers off the heater and makes the sensor

receptive to 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 6.3.4.

In idle mode the sensor will consume less power, but consider the sleep mode for most effective energy saving.

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6.3.3 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

0x3726

0x362F

0x372D

Mass flow

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.

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

Triggered

Consecutive read

Description

Byte1: DP 8msb

Byte2: DP 8lsb

Byte3: CRC

After a triggered measurement command, the

results can be read out when the sensor is

finished with the measurement.

measurement

Byte4: Temp 8msb

Byte5: Temp 8lsb

Byte6: CRC

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

Byte7: Scale Factor differential pressure 8msb condition.

Byte8: Scale Factor differential pressure 8lsb

The scale factor is for differential pressure in

Byte9: CRC

Pascal.

6.3.4 Soft Reset

Command

I²C address + W bit + Consecutive Description

command code (Hex) read

General call

reset

0x0006

This sequence resets the sensor.

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 2ms to reset. During this time the sensor will not acknowledge its

address nor accept commands.

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6.3.5 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 Description

read

Enter Sleep mode

0x3677

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 the sensor is in idle mode.

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. The sensor

should wake up within 2ms. Polling with a write header (I²C

address and a write bit) can be used to check whether the

sensor has woken up.

Exit Sleep mode

6.3.6 Read Product Identifier

During assembly and start-up of the system, 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, both preceded by a start

condition.

Command

Command code Consecutive read

Description

Read product 0x367C

Byte1: Product number [31:24]

Byte2: Product number [23:16]

Byte3: CRC

Note that both commands need to be preceded

with an I2C write header (I2C address + W).

The second command returns:

identifier

0xE102

Byte4: Product number [15:8]

Byte5: Product number [7:0]

Byte6: CRC

32 bit unique product and revision

number. The number is listed in the

table below.

Byte7: Serial number [63:56]

Byte8: Serial number [55:48]

Byte9: CRC

Note that the last 8 bits are the revision

number and can be subject to change.

64 bit unique serial number

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

Product

Product number

SDP800-500Pa 0x03020101

SDP810-500Pa 0x03020A01

SDP801-500Pa 0x03020401

SDP811-500Pa 0x03020D01

SDP800-125Pa 0x03020201

SDP810-125Pa 0x03020B01

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6.4 Checksum Calculation

The checksum byte is generated by a CRC algorithm with the following properties:

Property

Value

Name

CRC-8

Protected data

Width

read data

8 bit

Polynomial

Initialization

Reflect input

Reflect output

Final XOR

Example

0x31 (x8 + x5 + x4 +1)

0xFF

False

0x00

CRC(0xBEEF) = 0x92

6.5 Conversion to Physical Values

Conversion of the differential pressure and temperature sensor signals to a physical value is done with the scale factor.

6.5.1 Scale Factors

Parameter

SDP8xx-500Pa

60 Pa^-1

14’945 (inH₂O)^-1

200 °C^-1

SDP8xx-125Pa

240 Pa^-1

59’780 (inH₂O)^-1

200 °C^-1

Differential Pressure (Pascal)

Differential Pressure (inches H₂O)

Temperature (°C)

6.5.2 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 = sensor output  scale factor

6.5.3 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. Package Outline

7.1 Dimensions SDP80x – Manifold Connection

Figure 1: SDP80x. All dimensions in mm.

7.2 Dimensions SDP81x – Tube Connection

Figure 2: SDP81x. All dimensions in mm.

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7.3 Footprint

SCL VDD

GND SDA

Figure 3: Footprint for PCB mounting (top view = sensor side). All dimensions in mm.

A: Overall sensor dimensions

B: Holes for additional mounting screws (optional)

In case the sensor is not mounted on a PCB and is connected with a cable, the SDP800 series cap is recommended.

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8. Soldering

Standard wave soldering systems may be used for soldering SDP800 series sensors. Reflow soldering is not feasible and

may damage the sensor.

The sensor ports must be protected from solder splash and flux during soldering. Figure 4 shows an appropriate temperature

profile with maximum temperature values.

Entrance to solder Wave

Exit from solder Wave

(Time in wave < 2 s)

Flux zone Preheat zone

Solder Wave Peak

Temp. Max. 260°C

250°C

200°C

150°C

100°C

50°C

Approx. PCB bottom-

side temp.

Max 145°C

PCB top-side

temperature

0°C

Approx.

1 min

Start

Figure 4: Suitable wave soldering profile.

The characteristics of wave soldering machines vary, so any soldering setup must be tested before production use.

9. Shipping Package

SDP8xx are shipped in trays of 80pcs. The tray dimension is 355mm x 255mm x 21.5mm. By piling them up, the height per

tray can be considered as 19mm.

Revision History

Date

Author Version Changes

21.03.2018 ANB V1

Released

02.04.2019 ANB V1.1 Added SDP801-500Pa and SDP811-500Pa product variants, which have I²C address 0x26.

Minor clarifications in chapter 5.2, 6.1, 6.3.1 and 6.3.6. Made ‘Ordering information’ 1^stchapter.

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Important Notices

Warning, personal injury

such defects shall be found, to SENSIRION’s reasonable

satisfaction, to have arisen from SENSIRION’s faulty design,

material, or workmanship;

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.

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

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.

OF MERCHANTABILITY OR FITNESS FOR

PURPOSE, ARE EXPRESSLY EXCLUDED AND DECLINED.

A PARTICULAR

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.

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.

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.

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:

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.

CMOSens^®is a trademark of Sensirion

notice in writing describing the defects shall be given to

SENSIRION within fourteen (14) days after their appearance;

Headquarters and Subsidiaries

Sensirion AG

Sensirion Inc., USA

phone: +1 312 690 5858

info-us@sensirion.com

www.sensirion.com

Sensirion Korea Co. Ltd.

Laubisruetistr. 50

CH-8712 Staefa ZH

Switzerland

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

phone: +41 44 306 40 00

fax:

+41 44 306 40 30

info@sensirion.com

www.sensirion.com

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

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