sensirion_shta1_v2.2_c3

5/28/2018 Sensirion_SHTA1_V2.2_C3

1/10

www.sensirion.com Version 2.2 January 2009 1/10

Datasheet SHTA1Humidity and Temperature Sensor

Fully calibrated

Digital output Optimized accuracy between 50 - 95 %RH

Integrated protective filter

Fast response time

Excellent long term stability

Dimensions

Figure 1: Drawing of SHTA1, dimensions in mm (1mm =0.039inch). Contacts: 1:VDD, 2:SCK, 3:GND, 4:DATA.

Sensor Chip

SHTA1 features a version 4 Silicon sensor chip. Besideshumidity and a temperature sensor the chip contains anamplifier, A/D converter, OTP memory and a digitalinterface. The sensor can be identified by the traceabilitycode on the flexible PCB see example ABCD code onFigure 1.

Material Contents

While the sensor is made of a CMOS chip the sensorhousing consists of a PBT cap with epoxy glob top on apolyimide flexible PCB substrate. The device is fully RoHS

and WEEE compliant, thus it is free of Pb, Cd, Hg, Cr(6+),PBB and PBDE.

Evaluation Kits

For sensor trial measurements, for qualification of thesensor or even experimental application of the sensorthere is an evaluation kit EK-H2 available including astandard SHT11 sensor, hard and software to interfacewith a computer.

For more sophisticated and demanding measurements amulti port evaluation kit EK-H3is available which allows for

parallel application of up to 20 standard sensors.

Product Summary

The SHTA1 is a single chip relative humidity andtemperature sensor module designed for fast temperatureresponse time. The core of the SHTA1 is a CMOSenschip which ensures highest reliability and excellent long-term stability. The package is designed to deliver optimumaccuracy and response time in the critical humidity andtemperature range. The sensor is mounted on a flexiblePCB and is protected against contamination by a filter capincluding a membrane.

Each SHTA1 is individually calibrated in a precision

humidity chamber. The calibration coefficients are directlyprogrammed into an on-chip OTP memory for on-linesignal conditioning. The 2-wire serial interface and theinternal voltage regulation allow easy and fast systemintegration into electronic systems.

The sensor is fully RoHS compliant.

0.5

00.3

3.7

00.5

21.7

20.37.5

00.4

2.00 0.3

3.0

00.16.000.1

1.00 0.3

5.00 1.2

sensoropening

10.1

22.2

00.3

23.0

00.3 0.15- 0.10

0.3

00.3

1.50 0.3

1.00 0.30.65 0.1

020.130.1

4x 0.71 0.07

2.7

00.3 0.30 0.05

1.45

A

romsurface A

0.1352.553.05

0.15- 0.10

0.15- 0.102

.05+0.1

5

-0

.10

5.00 0.16.500.1

from

surfaceA

1 2 3 4

0.5

00.1

ABCD


2/10


Sensor Performance

Relative Humidity123

Parameter Condition min typ max Units

0.4 0.05 0.05 %RHResolution 1

8 12 12 bittypical 3.0 %RHAccuracy 2

maximal see Figure 2

Repeatability 0.1 %RH

Replacement fully interchangeable

Hysteresis 1 %RH

raw data 3 %RHNonlinearity

linearized


3/10


Users Guide SHTA1

1 Application Information

1.1 Operating Conditions

The sensor works stable within recommended normalrange see Figure 4. Long term exposures to conditionsoutside normal range, especially at humidity >80%RH,may temporarily offset the RH signal (+3 %RH after 60h).After return to normal range it will slowly return towardscalibration state by itself. See Section 1.4. ReconditioningProcedure to accelerate eliminating the offset. Prolongedexposure to extreme conditions may accelerate ageing.

Max.

Range

Normal

Range

0

20

40

60

80

100

-40 -20 0 20 40 60 80 100 120

Temperature (C)

RelativeH

umidity(%)

Figure 4:Operating Conditions

1.2 Mounting instructions

The SHTA1 is not intended for soldering (neither reflownor manually). For electrical connection surface mountable

ZIF (zero insertion force) FPCB connectors arerecommended. The flexible PCB is stiffened underneath tocontact pads by an additional polyimide layer (see Section6.1) to enhance mechanical stability. The pads consist of35m Cu, electroless Ni and Au.

The flexible PCB should not be bent andplugged/unplugged more than 5 times. The minimumallowable bending radius of the PCB is 1mm.

Do not apply force to the sensor cap during handling andusage (except force by flexible PCB and spring).

1.3 Storage Conditions and Handling InstructionsIt is of great importance to understand that a humiditysensor is not a normal electronic component and needs tobe handled with care. Chemical vapors at highconcentration in combination with long exposure timesmay offset the sensor reading. The connectivity of thecontact pads may be reduced after one year shelf life.

For these reasons it is recommended to store the sensorsin the original tape and reel package including the sealedESD bag at following conditions: Temperature shall be inthe range of 10C 50C (0 125C for limited time) and

humidity at 20 60%RH (sensors that are not stored inESD bags). Do not use glue or adhesive tapes to resealthe sensor package after opening. For sensors that have

been removed from the original packaging we recommendto stored them in ESD bags made of PE-HD7.

In manufacturing and transport the sensors shall beprevented from high concentration of chemical solventsand long exposure times. Out-gassing of glues, adhesivetapes and stickers or out-gassing packaging material suchas bubble foils, foams, etc. shall be avoided.Manufacturing area shall be well ventilated.

1.4 Reconditioning Procedure

As stated above extreme conditions or exposure to solventvapors may offset the sensor. The following reconditioningprocedure may bring the sensor back to calibration state:

Baking: 100 105C at < 5%RH for 10hRe-Hydration: 20 30C at ~ 75%RH for 12h 8.

1.5 Temperature Effects

Relative humidity reading strongly depends ontemperature. For example, at 90%RH a deviation of 1Ccauses a difference in the measurement signal of morethan 5%RH. Therefore, it is essential to keep humiditysensors at the same temperature as the surface at whichthe relative humidity is to be measured. In case of testingor qualification the reference sensor and test sensor must

show equal temperature to allow for comparing humidityreadings.

Furthermore, there are self-heating effects in case themeasurement frequency is too high. Please refer toSection 3.3 for detailed information.

1.6 Light

The SHTA1 is not light sensitive. Prolonged directexposure to sunshine or strong UV radiation may age thehousing.

1.7 MembranesThe SHTA1 contains a membrane which covers thesensor to keep away dirt and droplets. It also reducespeak concentrations of chemical vapors. Please be awarethat adding an additional filter membrane in the sensormodule housing reduces the sensors humidity responsetime. The dead volume between the additional filter andthe sensor should be as small as possible to minimizeresponse time. Further, the sensor module housing shouldbe well vented to ensure effective airflow to the sensor.

7 For example, 3M antistatic bag, product 1910 with zipper .8 75%RH can conveniently be generated with saturated NaCl solution.

100 105C correspond to 212 221F, 20 30C correspond to 68 86F


4/10

Datasheet SHTA1


1 2 3 4

AB

1.8 Materials Used for Mounting

Many materials absorb humidity and will act as a bufferincreasing response times and hysteresis. Materials in thevicinity of the sensor must therefore be carefully chosen.Recommended materials are: Any metals, LCP, POM

(Delrin), PTFE (Teflon), PE, PEEK, PP, PB, PPS, PSU,PVDF, PVF, PC.

For sealing and gluing (use sparingly): High filled epoxy forelectronic packaging (e.g. glob top, underfill), and Silicone.Out-gassing of these materials may also contaminate theSHTA1 (see Section 1.3). Therefore try to add the sensoras a last manufacturing step to the assembly, store theassembly well ventilated after manufacturing or bake at>50C for 24h to outgas contaminants before packing.

1.9 Wiring Considerations and Signal Integrity

Carrying the SCK and DATA signal parallel and in closeproximity (e.g. in wires) for more than 10cm may result incross talk and loss of communication. This may beresolved by routing VDD and/or GND between the twodata signals and/or using shielded cables. Furthermore,slowing down SCK frequency will possibly improve signalintegrity. Power supply pins (VDD, GND) must bedecoupled with a 100nF capacitor if wires are used.Capacitor should be placed as close to the sensor aspossible.

1.10 ESD (Electrostatic Discharge)

ESD immunity is qualified according to MIL-STD-883E,method 3015 (Human Body Model at 2 kV).

Latch-up immunity is provided at a force current of

100mA with Tamb = 80C according to JEDEC78A.Functional schematics of the ESD protection circuits onthe chip are given in Figure 5.

Figure 5:ESD protection circuits for VDD, SCK and DATA.

2 Interface Specifications

Pin Name Comment

1 VDD Source Voltage

2 SCK Serial Clock, input only

3 GND Ground

4 DATA Serial Data, bidirectional

Table 1:SHTA1 pad assignment.

2.1 Power Pins (VDD, GND)

The supply voltage of SHTA1 must be in the range of 2.4 5.5V, recommended supply voltage is 3.3V. Powersupply pins Supply Voltage (VDD) and Ground (GND)must be decoupled with a 100nF capacitor see Figure 6.

The serial interface of the SHTA1 is optimized for sensorreadout and effective power consumption. The sensorcannot be addressed by I2C protocol, however, the sensorcan be connected to an I2C bus without interference withother devices connected to the bus. The controller mustswitch between the protocols.

Figure 6:Typical application circuit, including pull up resistor RPand decoupling of VDD and GND by a capacitor.

2.2 Serial clock input (SCK)

SCK is used to synchronize the communication betweenmicrocontroller and SHTA1. Since the interface consists offully static logic there is no minimum SCK frequency.

2.3 Serial data (DATA)

The DATA tri-state pin is used to transfer data in and outof the sensor. For sending a command to the sensor,DATA is valid on the rising edge of the serial clock (SCK)and must remain stable while SCK is high. After the fallingedge of SCK DATA may be changed. For safecommunication DATA valid shall be extended TSUand THObefore the rising and after the falling edge of SCK,respectively see Figure 7. For reading data from thesensor, DATA is valid TV after SCK has gone low andremains valid until the next falling edge of SCK.

To avoid signal contention the microcontroller must onlydrive DATA low. An external pull-up resistor (e.g. 10k) isrequired to pull the signal high it should be noted thatpull-up resistors may be included in I/O circuits of

microcontrollers. See Table 2 for detailed I/O characteristicof the sensor.

SCK

GND

VDD

DATA

GND

VDD

GND

VDD

Micro-Controller(Master)

2.4 5.5V GND

100nF

VDD

SCK

DATA

Rp 10k

VDD GND

SHTA1 (Slave)

ABCD


5/10

Datasheet SHTA1


2.4 Electrical Characteristics

The electrical characteristics such as power consumption,low and high level, input and output voltages depend onthe supply voltage. Table 2 gives electrical characteristicsof SHTA1 with the assumption of 5V supply voltage if not

stated otherwise. For proper communication with thesensor it is essential to make sure that signal design isstrictly within the limits given in Table 3 and Figure 7.

Figure 7: Timing Diagram, abbreviations are explained inTable 3. Bold DATA line is controlled by the sensor, plain DATAline is controlled by the micro-controller. Both valid times refer tothe left SCK toggle.

Parameter Conditions min typ max Units

Power supply DC9 2.4 3.3 5.5 V

measuring 0.55 1 mAaverage10 2 28 ASupply current

sleep 0.3 1.5 A

Low level outputvoltage

IOL< 4 mA 0 250 mV

High level outputvoltage

RP< 25 k 90% 100% VDD

Low level inputvoltage

Negative going 0% 20% VDD

High level inputvoltage

Positive going 80% 100% VDD

Input current onpads 1 A

on 4 mAOutput current

Tri-stated (off) 10 20 A

Table 2: SHTA1 DC characteristics. RP stands for pull upresistor, while IOLis low level output current.

9 Recommended voltage supply for highest accuracy is 3.3V, due to sensorcalibration.

10Minimum value with one measurement of 8 bit accuracy without OTP reloadper second, typical value with one measurement of 12bit accuracy persecond.

Parameter Conditions min typ max Units

VDD > 4.5V 0 0.1 5 MHzFSCK SCK Frequency

VDD < 4.5V 0 0.1 1 MHz

TSCKx SCK hi/low time 100 ns

TR/TF SCK rise/fall time 1 200 * ns

OL = 5pF 3.5 10 20 nsTFO DATA fall time

OL = 100pF 30 40 200 ns

TRO DATA rise time ** ** ** ns

TV DATA valid time 200 250 *** ns

TSU DATA setup time 100 150 *** ns

THO DATA hold time 10 15 **** ns

* TR_max+ TF_max = (FSCK)-1 TSCKH TSCKL

** TR0 is determined by the RP*Cbustime-constant at DATA line

*** TV_maxand TSU_maxdepend on external pull-up resistor (RP) and total busline capacitance (Cbus) at DATA line

**** TH0_max < TV max (TR0, TF0)

Table 3: SHTA1 I/O signal characteristics, OL stands for OutputLoad, entities are displayed in Figure 6.

3 Communication with Sensor

3.1 Start up Sensor

As a first step the sensor is powered up to chosen supply

voltage VDD. The slew rate during power up shall not fallbelow 1V/ms. After power-up the sensor needs 11ms toget to Sleep State. No commands must be sent beforethat time.

3.2 Sending a Command

To initiate a transmission, a Transmission Start sequencehas to be issued. It consists of a lowering of the DATA linewhile SCK is high, followed by a low pulse on SCK andraising DATA again while SCK is still high see Figure 8.

Figure 8:"Transmission Start" sequence

The subsequent command consists of three address bits(only 000 is supported) and five command bits. TheSHTA1 indicates the proper reception of a command by

pulling the DATA pin low (ACK bit) after the falling edge ofthe 8th SCK clock. The DATA line is released (and goeshigh) after the falling edge of the 9th SCK clock.

DATA valid readDATA valid write

DATA

SCK90%10

90%10%

TV

TSCKL

TSU THO

TSCKTSCKH

TR TF

TROTFO

DATA

SCK90%10%

90%10%


6/10

Datasheet SHTA1


Command Code

Reserved 0000x

Measure Temperature 00011

Measure Relative Humidity 00101

Read Status Register 00111

Write Status Register 00110

Reserved 0101x-1110x

Soft reset, resets the interface, clears thestatus register to default values. Wait minimum11 ms before next command

11110

Table 4: SHTA1 list of commands

3.3 Measurement of RH and T

After issuing a measurement command (00000101 forrelative humidity, 00000011 for temperature) thecontroller has to wait for the measurement to complete.This takes a maximum of 20/80/320 ms for a 8/12/14bitmeasurement. The time varies with the speed of theinternal oscillator and can be lower by up to 30%. Tosignal the completion of a measurement, the SHTA1 pullsdata line low and enters Idle Mode. The controller mustwait for this Data Ready signal before restarting SCK toreadout the data. Measurement data is stored untilreadout, therefore the controller can continue with othertasks and readout at its convenience.

Two bytes of measurement data and one byte of CRC

checksum (optional) will then be transmitted. The microcontroller must acknowledge each byte by pulling theDATA line low. All values are MSB first, right justified (e.g.the 5thSCK is MSB for a 12bit value, for a 8bit result thefirst byte is not used).

Communication terminates after the acknowledge bit ofthe CRC data. If CRC-8 checksum is not used thecontroller may terminate the communication after themeasurement data LSB by keeping ACK high. The deviceautomatically returns to Sleep Mode after measurementand communication are completed.

Important: To keep self heating below 0.1C, SHTA1should not be active for more than 10% of the time e.g.maximum one measurement per second at 12bit accuracyshall be made.

3.4 Connection reset sequence

If communication with the device is lost the following signalsequence will reset the serial interface: While leavingDATA high, toggle SCK nine or more times see Figure 9.This must be followed by a Transmission Start sequencepreceding the next command. This sequence resets the

interface only. The status register preserves its content.

Figure 9:Connection Reset Sequence

3.5 CRC-8 Checksum calculation

The whole digital transmission is secured by an 8bitchecksum. It ensures that any wrong data can be detectedand eliminated. As described above this is an additionalfeature of which may be used or abandoned.

Please consult Application Note CRC-8 ChecksumCalculation for information on how to calculate the CRC.

Status Register

Some of the advanced functions of the SHTA1 such asselecting measurement resolution, end of battery notice orusing the heater may be activated by sending a commandto the status register. The following section gives a briefoverview of these features. A more detailed description isavailable in the Application Note Status Register.

After the command Status Register Read or StatusRegister Write see Table 4 the content of 8 bits of thestatus register may be read out or written. For thecommunication compare Figures 10 and 11 the

assignation of the bits is displayed in Table 5.

0 0 0 0 0 1 1 0 Status RegisterTS

ACK

Bit7

ACK

Figure 10:Status Register Write

Figure 11:Status Register Read

Examples of full communication cycle are displayed in

Figures 12 and 13.

0 0 0 Command 0 0 MSBTS

Wait forDATA ready A

CK

LSB Checksum

LSb

ACK

ACK

Figure 12: Overview of Measurement Sequence. TS = Trans-mission Start, MSB = Most Significant Byte, LSB = LastSignificant Byte, LSb = Last Significant Bit.

0 0 0 0 0 1 1 1 Status Register ChecksumTS

ACK

Bit7

ACK

Bit7

ACK

DATA

SCK90%10%

90%10

1 2 3

4 - 8 9

Transmission Start


7/10


Figure 13: Example RH measurement sequence for value 0000100100110001 = 2353 = 75.79 %RH (without temperaturecompensation). DATA valid times are given and referenced in boxes on DATA line. Bold DATA lines are controlled by sensor while plainlines are controlled by the micro-controller.

Bit Type Description Default

7 reserved 0

6 R

End of Battery (low voltagedetection)0 for VDD > 2.471 for VDD < 2.47

X

No default value,bit is only updatedafter ameasurement

5 reserved 04 reserved 0

3 For Testing only, do not use 0

2 R/W Heater 0 off

1 R/W no reload from OTP 0 reload

0 R/W

1 = 8bit RH / 12bit Temp.resolution0 = 12bit RH / 14bit Temp.resolution

012bit RH14bit Temp.

Table 5:Status Register Bits

Measurement resolution: The default measurementresolution of 14bit (temperature) and 12bit (humidity) canbe reduced to 12 and 8bit. This is especially useful in highspeed or extreme low power applications.

End of Battery function detects and notifies VDD voltages

below 2.47 V. Accuracy is 0.05 V.

Heater: An on chip heating element can be addressed bywriting a command into status register. The heater mayincrease the temperature of the sensor by 5 10C11beyond ambient temperature. The heater draws roughly8mA @ 5V supply voltage.

11Corresponds to 9 18F

For example the heater can be helpful for functionalityanalysis: Humidity and temperature readings before andafter applying the heater are compared. Temperature shallincrease while relative humidity decreases at the sametime. Dew point shall remain the same.

Please note: The temperature reading will display the

temperature of the heated sensor element and notambient temperature. Furthermore, the sensor is notqualified for continuous application of the heater.

4 Conversion of Signal Output

4.1 Relative Humidity

For compensating non-linearity of the humidity sensor see Figure 14 and for obtaining the full accuracy of thesensor it is recommended to convert the humidity readout

(SORH) with the following formula with coefficients given inTable 6:2

RH3RH21linear SOcSOccRH ++= (%RH)

SORH c1* c2* c3*

12 bit -2.0468 0.0367 -1.5955E-6

8 bit -2.0468 0.5872 -4.0845E-4

Table 6: Humidity conversion coefficients

For simplified, less computation intense conversionformulas see Application Note RH and Temperature Non-

Linearity Compensation. Values higher than 99% RHindicate fully saturated air and must be processed and

DATA

DATA

SCK

SCK

SCK

DATA

A2 A1 A0 C4 C3 C2 C1 C0 ACK

15 14 13 12 11 10 9 8 ACK 7 6 5 4 3 2 1 0 ACK

7 6 5 4 3 2 1 0 ACK

Transmission Start Address = 000 Command = 00101

12bit Humidity Data

CRC-8 Checksum Transmission Start

Measurement (80ms for 12bit)

Sleep (wait for nextmeasurement)

Idle Bits Skip ACK to end trans-mission (if no CRC is used)

Skip ACK to end transmission

Sensor pulls DATA line low aftercompletion of measurement

MSb LSb

MSb LSb

15 14 13 12 11 10 9 8 ACK 7 6 5 4 3 2 1 0 ACK

A2 A1 A0 C4 C3 C2 C1 C0 ACK

7 6 5 4 3 2 1 0 ACK


8/10

Datasheet SHTA1


displayed as 100%RH12. Please note that the humiditysensor has no significant voltage dependency.

0%

20%

40%

60%

80%

100%

0 500 1000 1500 2000 2500 3000 3500

SORHsensor readout (12bit)

RelativeHumidity

Figure 14:Conversion from SORHto relative humidity

4.2 Temperature compensation of Humidity Signal

For temperatures significantly different from 25C (~77F)the humidity signal requires a temperature compensation.

The temperature correction corresponds roughly to0.12%RH/C @ 50%RH. Coefficients for the temperaturecompensation are given in Table 7.

( ) ( ) linearRH21Ctrue RHSOtt25TRH ++=

SORH t1 t2

12 bit 0.01 0.00008

8 bit 0.01 0.00128

Table 7:Temperature compensation coefficients

4.3

TemperatureThe band-gap PTAT (Proportional To AbsoluteTemperature) temperature sensor is very linear by design.Use the following formula to convert digital readout (SOT)to temperature value, with coefficients given in Table 8:

T21 SOddT +=

VDD d1 (C) d1 (F) SOT d2 (C) d2 (F)

5V -40.1 -40.2 14bit 0.01 0.018

4V -39.8 -39.6 12bit 0.04 0.072

3.5V -39.7 -39.5

3V -39.6 -39.3

2.5V -39.4 -38.9

Table 8: Temperature conversion coefficients.

4.4 Dew Point

SHTA1 is not measuring dew point directly; however dewpoint can be derived from humidity and temperaturereadings. Since humidity and temperature are both

12 If wetted excessively (strong condensation of water on sensor surface),sensor output signal can drop below 100%RH (even below 0%RH in somecases), but the sensor will recover completely when water dropletsevaporate. The sensor is not damaged by water immersion or condensation.

measured on the same monolithic chip, the sensor allowssuperb dew point measurements.

For dew point (Td) calculations there are various formulasto be applied, most of them quite complicated. For thetemperature range of -40 50C the following

approximation provides good accuracy with parametersgiven in Table 9:

( )

TT

Tm

100%

RHlnm

TT

Tm

100%

RHln

TTRH,T

n

nnd

+

+

+

=

Temperature Range Tn (C) m

Above water, 0 50C 243.12 17.62

Above ice, -40 0C 272.62 22.46

Table 9:Parameters for dew point (Td) calculation.

Please note that ln() denotes the natural logarithm. ForRH and T the linearized and compensated values forrelative humidity and temperature shall be applied.

For more information on dew point calculation seeApplication Note Dew point calculation.

5 Environmental Stability

If sensors are qualified for assemblies or devices, pleasemake sure that they experience same conditions as thereference sensor. It should be taken into account thatresponse times in assemblies may be longer, henceenough dwell time for the measurement shall be granted.For detailed information please consult the QualificationGuide.

Sensirions standard SHT1x humidity and temperaturesensor has been fully tested according to AEC-Q100 Rev.F, grade 2 (refer to the Datasheet SHT1x). For thecustomized version SHTA1 additional tests as listed in

Table 1013 have been performed to validate the designchanges.

13Sensor operation temperature range is -40 to 105C according to AEC-Q100temperature grade 2.


9/10

Datasheet SHTA1


Test Standard Results14

HTOL 105C, 500 hours Withinspecifications

TC -40C - 105C, 500 cyclesAcc. JESD22-A104-C

Withinspecifications

THB 85C / 85%RH, 500 hours Withinspecifications

HAST 130C/85%RH, 96 hours Electrical func-tionality passed

ESDimmunity *

MIL-STD-883E, method 3015(Human Body Model at 2kV)

Qualified

Latch-up * force current of 100mA withTamb= 80C, acc. JEDEC 17

Qualified

WBP before and after TC, acc. MIL-STD-883E, Method 2011.7

Qualified

Cap Shear before and after TC, acc. MIL-STD-883E, Method 2019.5

Qualified

Die Shear before and after TC, acc. MIL-STD-883E, Method 2019.5

Qualified

* Tests performed on chip level.

Table 10: Qualification tests for SHTA1: HTOL = HighTemperature Operation Lifetime, TC = Temperature Cycles,THB = Temperature Humidity Biased, HAST = HighlyAccelerated Stress Test, WBP = Wire Bond Pull.

6 Packaging

6.1 Packaging typeSHTA1 are supplied as a single Cu-layer flexible PCBwhich consists of a copper metallization laminated into twopolyimide layers. At the contact area the PCB is stiffenedby an additional polyimide layer, see Figure 15.

Figure 15: Crosssectional structure at the body part of flexPCB (left) and at the contact pads (right).

The contact pads are coated with a bilayer of Ni and Au.

The sensor housing consists of a PBT cap with a porousTeflon membrane. The pore size is adjusted to provideoptimum protection against contamination at minimumsensor response time. The housing is sealed with anepoxy globtop. The sensor is fully RoHS and WEEEcompliant; hence, it is free of of Pb, Cd, Hg, Cr(6+), PBBand PBDE.

14According to accuracy and long term drift specification given on Page 2.

6.2 Traceability Information

All SHTA1 are marked with a lot number. The lot numberallows for full traceability through production, calibrationand testing.

Labels on the reels are displayed in Figures 16 and 17,

they both provide traceability information.

Figure 16:First label on reel: 100633 = Sensor Type (SHTA1),01 = product revision number, Y = last digit of year, RRRR =number of sensors on reel, TTTT = Traceability Code.

Figure 17:Second label on reel: Delivery Date (also Date Code)

is the date of packaging of sensors (DD = day, MM = month,YYYY = year), CCCC = Sensirion order number.

6.3 Shipping Package

SHTA1 are shipped in 44mm tape at 1300pcs for detailssee Figure 18. Reels are individually labeled with barcodeand human readable labels. All tapes have a minimum of276mm empty leader tape (first pockets of the tape) and aminimum of 276mm empty trailer tape (last pockets of thetape).

Figure 18: Tape configuration and unit orientation, dimensionsin mm (1mm = 0.039inch). The leader tape is at the right side.

Lot No.: 100633-01-YRRRRTTTT

Quantity: RRRR

RoHS: Compliant

Lot No.

Device Type: 1-100633-01

Description: SHTA1 Humidity and Temperature

Sensor

Part Order No. 1-100633-01

Date of Delivery: DD.MM.YYYY

Order Code: 45CCCC / 0

2.00 0.15

12.001.50 MIN

2.00 MIN4.00

1.75

0.1

34.2

0.3

44.0

0.3

R0.5 TYP5.42 0.15

4.1

0.30 0.05R0.3 MAX

23.7

3.4

7.1

40.4

0.1

6.8

4.6

3.6

0.135mm

cover film, 25m (1mil)adhesive

Cu, 35m (1.4mil)

adhesivebase film, 25m (1mil)adhesive

stiffener

0.30

0.05 mm


10/10


Revision History

Date Version Page(s) Changes

9 October 2007 2.0 1-6 New release of datasheet

21 May 2008 2.1 1-6 Redesign of page 1 and contacts

21 January 2009 2.2 1-10 Updated drawing Fig. 1, added detailed users guide

Important Notices

Warning, Personal Injury

Do not use this product as safety or emergency stop devices or inany other application where failure of the product could result inpersonal injury. 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 data sheet andapplication notes. Failure to comply with these instructions couldresult in death or serious injury.

If the Buyer shall purchase or use SENSIRION products for anyunintended or unauthorized application, Buyer shall defend, indemnifyand 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 associatedwith such unintended or unauthorized use, even if SENSIRION shall beallegedly negligent with respect to the design or the manufacture of theproduct.

ESD Precautions

The inherent design of this component causes it to be sensitive toelectrostatic discharge (ESD). To prevent ESD-induced damage and/ordegradation, take customary and statutory ESD precautions whenhandling this product.See application note ESD, Latchup and EMC for more information.

Warranty

SENSIRION warrants solely to the original purchaser of this product fora period of 12 months (one year) from the date of delivery that thisproduct shall be of the quality, material and workmanship defined inSENSIRIONs published specifications of the product. Within suchperiod, if proven to be defective, SENSIRION shall repair and/orreplace this product, in SENSIRIONs 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 SENSIRIONs reasonablesatisfaction, to have arisen from SENSIRIONs faulty design,material, or workmanship;

the defective product shall be returned to SENSIRIONs factory atthe Buyers expense; and

the warranty period for any repaired or replaced product shall belimited to the unexpired portion of the original period.

This warranty does not apply to any equipment which has not beeninstalled and used within the specifications recommended bySENSIRION for the intended and proper use of the equipment.EXCEPT FOR THE WARRANTIES EXPRESSLY SET FORTHHEREIN, SENSIRION MAKES NO WARRANTIES, EITHER EXPRESSOR IMPLIED, WITH RESPECT TO THE PRODUCT. ANY AND ALLWARRANTIES, INCLUDING WITHOUT LIMITATION, WARRANTIESOF MERCHANTABILITY OR FITNESS FOR A PARTICULARPURPOSE, ARE EXPRESSLY EXCLUDED AND DECLINED.SENSIRION is only liable for defects of this product arising under the

conditions of operation provided for in the data sheet and proper use ofthe goods. SENSIRION explicitly disclaims all warranties, express orimplied, for any period during which the goods are operated or storednot in accordance with the technical specifications.SENSIRION does not assume any liability arising out of any applicationor use of any product or circuit and specifically disclaims any and allliability, including without limitation consequential or incidentaldamages. All operating parameters, including without limitationrecommended parameters, must be validated for each customersapplications by customers technical experts. Recommendedparameters can and do vary in different applications.SENSIRION reserves the right, without further notice, (i) to change theproduct specifications and/or the information in this document and (ii) toimprove reliability, functions and design of this product.

Copyright

2008, SENSIRION.CMOSensis a trademark of Sensirion

All rights reserved

Headquarter and Sales OfficesHeadquarter Sales Office USA:SENSIRION AG Phone: + 41 (0)44 306 40 00 SENSIRION Inc. Phone: 805 409 4900Laubisruetistr. 50 Fax: + 41 (0)44 306 40 30 2801 Townsgate Rd., Suite 204 Fax: 805 435 0467CH-8712 Staefa ZH [email protected] Westlake Village, CA 91361 [email protected] http://www.sensirion.com/ USA http://www.sensirion.com/

Sales Office Korea: Sales Office Japan:SENSIRION KOREA Co. Ltd. Phone: 031 440 9925~27 SENSIRION JAPAN Co. Ltd. Phone: 03 3444 4940#1414, Anyang Construction Tower B/D, Fax: 031 440 9927 Postal Code: 108-0074 Fax: 03 3444 4939

1112-1, Bisan-dong, Anyang-city [email protected] Shinagawa Station Bldg. 7F, [email protected] http://www.sensirion.co.kr 4-23-5, Takanawa, Minato-ku http://www.sensirion.co.jpSouth Korea Tokyo, Japan

Find your local representative at: http://www.sensirion.com/reps

sensirion_shta1_v2.2_c3

Documents