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Datasheet SHT10, SHT11, SHT15
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1. Tel 0755 61288164 89605981 89533801 Fax 0755 61288174 WWW SENSEIOT COM V1 0 2014 12
2. Freescale TI Sharp GE Amphenol 14 Silicon Labs PLX Micron Sensirion SenseAir ST City Honeywell Measurement HumireD EF AEA TUME RFRA EHEM AmaE MARENE Aii EZTEN PT Sensirion Sil icon Labs MEAS ST TI SHT1X 2X 7X S17020 21 HTU20 21D HTS221 HDC1000 1008 HYT221 271 939 NTC PM2 5 C02 MSM 1401 1403 1405 1408 1411 1413 1415 1418 FRA RE HEME DAMLA VOC RS232 485 WIF Sensirion FSL SDP600 1000 2000 1108 2108 AF MPL MEMS C02 FRB CO H2S H2S 02 CPU MCU ARM DS KINETIS MK60DN512 MSP430 C8051 LPC STC PIC
3. Temperature LSB Temperature MSB Temperature CRC checksum Figure 7 Communication sequence for starting a measurement and reading measurement results displaying both clock stretching options The numerical example corresponds to a read humidity first command with clock stretching enabled The physical values of the transmitted measurement results are 65 6 RH and 23 7 C Clear blocks are controlled by the microcontroller grey blocks by the SHTC1 Wwww sensirion com Version 3 May 2014 8 14 SENSIRION THE SENSOR COMPANY 1 2 3 4 6 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 2C address write Command MSB Command LSB Figure 8 Command access communication sequence The example shows a soft reset command Clear blocks are controlled by the microcontroller grey blocks by the SHTC1 6 Quality 6 1 Environmental Stability Qualification of the SHTC1 is performed based on the JEDEC JESD47 qualification test method 6 2 Material Contents The device is fully ROHS and WEEE compliant e g free of Pb Cd and Hg 1 Packaging and Traceability SHTC1 sensors are provided in a DFN package with an outline of 2 x 2 x 0 75 mm and a terminal pitch of 1 mm DFN stands for dual flat no leads The humidity sensor opening is centered on the top side of the package The sensor chip is made of silicon and is mounted to a lead frame The latter is made
4. SHARP GP2Y1010AU0F GP2Y1050AU0F GP2Y1051AU0F GE SM PWM 01A GE T6613 T6615 SenseAir K30 S8 ELT B530 P Freescale IMX MCIMX536 STM32 LPC2000 3000 ADC TI ADI AFE5805ZCF AD600 SDRAM HYNIX MT29F256 128 64 H5DU AF FIFO PCI E PC19054 PEX8112 8619 8632 8648 TL16C550 552 554 S5920 S5933 TI CC3000 CC2530F256 CC2591 CC2540 CC1101 WIFI ZIGBEE SIMCOM SIM900B 900A 900D 900S GSM GPRS MARVELL 88E PHY 88W DM9000 DM9161 CS8900 KF RTL8019 8139 8201 LXT970 971 PHY USB CY7C063001 68013 SL811 USBN9603 9604 PDIUSBD12 USB RS232 485 RS232 422 485 FT232 Micrel DIALOG DA9053 3HHA1 FHA1 FSL IMX515 535 536
5. 0101 1101 Table 10 Soft reset command 5 7 Read out of ID Register The SHTC1 has an ID register which contains an SHTC1 specific product code The read out of the ID register can be used to verify the presence of the sensor and proper communication The command to read the ID register is shown in Table 11 Read ID register OxEFC8 1110 1111 1100 1000 Table 11 Read out command of ID register lt needs to be sent to the SHTC1 after an 12C write header After the SHTC1 has acknowledged the proper reception of the command the master can send an 12C read header and the SHTC1 will submit the 16 bit ID followed by 8 bits of CRC The structure of the ID is described in Table 12 6 bit ID XXXX XXXX XX 000111 bits 5 to 0 SHTC1 specific product code bits 15 to 6 unspecified information Table 12 Structure of the 16 bit ID Bits 15 6 of the ID contain unspecified information marked as x which may vary from sensor to sensor while bits 5 0 contain the SHTC1 specific product code 5 8 Checksum Calculation The 8 bit CRC checksum transmitted after each data word is generated by a CRC algorithm with the properties displayed in Table 13 The CRC covers the contents of the two previously transmitted data bytes Version 3 May 2014 7 14 Reflecting Reflect outpui Examples CRC 0x00 OxAC CRC oo 0x92 Table 13 SHTC1 IC CRC properties 5 9 Conversion of Sensor Output Measurement data is always transferred as
6. Phone 81 3 3444 4940 SENSIRION THE SENSOR COMPANY e such defects shall be found to SENSIRION s reasonable satisfaction to have arisen from SENSIRION s faulty design material or workmanship e the defective product shall be returned to SENSIRION s factory at the Buyer s expense and e 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 data sheet 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 A
7. of Cu plated with Ni Pd Au Chip and lead frame are overmolded by a green epoxy based mold compound Please note that the side walls of sensor are diced and therefore these diced lead frame surfaces are not covered with the respective plating The Moisture Sensitivity Level classification of the STSC1 is MSL1 according to IPC JEDEC J STD 020 All SHTC1 sensors are laser marked for easy identification and traceability The marking on the sensor consists of two lines and a pin 1 indicator The top line contains the sensor type SHTC1 the bottom line contains a 5 digit www sensirion com alphanumeric tracking code The pin 1 indicator is located in the top left corner See Figure 9 for illustration SHTC1 Figure 9 Laser marking on SHTC1 the top line with the pin 1 indicator and the sensor type the bottom line with the 5 digit alphanumeric tracking code Reels are also labeled and provide additional traceability information 8 Ordering Information The SHTC1 can be ordered in tape and reel packaging with different sizes see Table 14 The reels are sealed into antistatic ESD bags A drawing of the packaging tape with sensor orientation is shown in Figure 12 Quantity Packaging IReel Diameter Order Number 1000 Tape amp Reel 180 mm 7 inch 1 101110 01 10 000 330 mm 13 inch 1 100925 01 Table 14 SHTC1 ordering options Version 3 May 2014 9 14 SENSIRION THE SENSOR COMPANY 9 Technic
8. with an optional STOP condition P as described in the I2C bus specification Whenever the sensor is powered up but not performing a measurement or communicating it automatically enters idle state for energy saving Please note that in case VDD is set to 0 V GND e g in case of a power off of the SHTC1 the SCL and SDA pads are also pulled to GND Consequently the C bus is blocked while VDD of the SHTC1 is set to 0 V 5 2 Measurement Commands The SHTC1 provides the possibility to define the sensor behavior during measurement as well as the transmission sequence of measurement results These characteristics are defined by the appropriate measurement command see Table 9 Each measurement command triggers both a temperature and a humidity measurement Clock Stretching Clock Stretching Enabled Disabled Read T Read H Read T Read H First First First First Ox7CA2 0x5C24 0x7866 0x58E0 Table 9 Measurement commands Version 3 May 2014 6 14 5 3 Starting a Measurement A measurement communication sequence consists of a START condition followed by the 2 C header with the 7 bit lC device address and a write bit write W 0 The sensor indicates the proper reception of a byte by pulling the SDA pin low ACK bit after the falling edge of the 8th SCL clock Then the sensor is ready to receive a 16 bit measurement command Again the SHTC1 acknowledges the proper reception of each byte with ACK condition A complet
9. 16 bit values These values are already linearized and temperature 5 10 Communication Data Sequences 1 2 3 4 5 6 7 9 X Cuuugaoag i I2C address write Measurement command MSB SENSIRION THE SENSOR COMPANY compensated by the SHTC1 Humidity and temperature values can be calculated with the formulas in given below Relative humidity conversion formula result in RH RH 100 284 2 Temperature conversion formula result in C T 45 4175 22 2 SRH and ST denote the raw sensor output as decimal values for humidity and temperature respectively 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Measurement command LSB Measurement in Measurement in progress _ l 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 clock stretching E disabled P ISHTC1 measuring ee de s 11010101011 Q 2 Pepea Are S Te an measurement contd Measurement I C address read while meas is in prog polling completed 29 30 31 32 33 34 35 36 37 38 dock SHTC1 measuring stretching enabled I2C address read while meas is in progress SCL line pulled low measurement continued Humidity MSB Humidity LSB ojola loeli ofoofo Humidity CRC checksum 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104
10. Data Sheet SHTC1 Humidity and Temperature Sensor IC Best performance to price ratio Fully calibrated and reflow solderable Ultra low power consumption Power up and measurement within 1 ms 1 8 V supply voltage Ultra small DFN package 2 x 2 x 0 75 mm Typical accuracy 3 RH and 0 3 C Product Summary The SHTC1 is a digital humidity and temperature sensor designed especially for high volume consumer electronics applications This sensor is strictly designed to overcome conventional limits for size power consumption and performance to price ratio in order to fulfill current and future requirements Sensirion s CMOSens technology offers a complete sensor system on a single chip consisting of a capacitive humidity sensor a bandgap temperature sensor analog and digital signal processing A D converter calibration data memory and a digital communication interface supporting 1C fast mode The ultra small 2 x 2 x 0 75 mm DFN package enables applications in even the most limited of spaces Benefits of Sensirion s CMOSens Technology High reliability and long term stability Industry proven technology with a track record of more than 10 years Designed for mass production Optimized for lowest cost Low signal noise Contents of this Data Sheet 1 Humidity and Temperature Sensor Specifications 2 2 Electrical Specifications es 3 3 Timing Specifications 00 cee eceeeeeeeeeste
11. aging tape with sensor orientation in tape Header tape is to the right and trailer tape to the left on this drawing Dimensions are given in millimeters www sensirion com Version 3 May 2014 11 14 SENSIRION THE SENSOR COMPANY 10 Further Information For more in depth information on the SHTC1 and its application please consult the following documents Available for download from the SHTC1 product website www sensirion com shtc Available for download from the SHTC1 product website www sensirion com shtc Available for download from the SHTC1 product website www sensirion com shtc Available for download at the Sensirion humidity sensors download center www sensirion com humidity download Available for download at the Sensirion humidity sensors download center www sensirion com humidity download Available for download at the Sensirion humidity Definition of sensor specifications sensors download center www sensirion com humidity download SHTxx Assembly of SMD Instructions on soldering and processing of the Packages SHTC1 in a production environment SHTC1 Optimization of Measures for optimization of repeatability of Repeatibility sensor output SHTC1 Low Power Measurement Description of SHTC1 low power measurement Mode mode Design guidelines for designing SHTxx humidity SHTxx Design Guide a sensors into applications Guidelines for proper handling of SHTxx humidity SHTxx Handling Instruct
12. al Drawings 9 1 Package Outline 0 35 0 2x45 0 75 Mold opening shows smooth transition to package surface Therefore this dimension is not well defined and given for reference only Figure 10 Package outline drawing of the SHTC1 Dimensions are given in millimeters www sensirion com Version 3 May 2014 10 14 SENSIRION THE SENSOR COMPANY 9 2 Metal Land Pattern 1 60 ns ed woe A PACKAGE ro OUTLINE SS 0 10 SS i nh CO 0 70 Y 9 id Yi a NOTE po SOLDER PAD DIMENSIONS COPPER r77 SOLDER PASTE DIMENSIONS L STENCIL OPENING ALL DIMENSIONS ARE IN MILLIMETERS Figure 11 Recommended metal land pattern for SHTC1 all dimensions are in mm Recommended solder paste stencil thickness is 100m pads on PCB are recommended to be non solder mask defined NSMD 9 3 Tape and Reel Package 2 00 0 SEE NOTE 3 4 00 SEE NOTE 1 5 0 1 0 0 0 30 05 R 0 20 MAX 0 ie 8 0 0 3 0 1 A R0 2 TYP SECTION A A NOTES 1 10 SPROCKET HOLE PITCH CUMULATIVE TOLERANCE 40 2 ho 2 235 2 CAMBER IN COMPLIANCE WITH EIA 481 Bo 2 25 TOLERANCES UNLESS 3 POCKET POSITION RELATIVE TO SPROCKET HOLE MEASURED Ko 1 15 NOTED IPL 2 2PL 4 10 AS TRUE POSITION OF POCKET NOT POCKET HOLE 4 Ao AND Bo ARE CALCULATED ON A PLANE AT A DISTANCE R ABOVE THE BOTTOM OF THE POCKET Figure 12 Technical drawing of the pack
13. al input output pads SDA directions are seen from the sensor Bold SDA lines are controlled by the sensor plain SDA lines are controlled by the micro controller Note that SDA valid read time is triggered by falling edge of preceding toggle www sensirion com Version 3 May 2014 5 14 4 Interface Specifications The SHTC1 supports I2C fast mode SCL clock frequency from 0 to 400 kHz with clock stretching For detailed information on the I2C protocol refer to NXP C bus specification and user manual UM10204 Rev 4 February 13 2012 http ics nxp com support documents interface pdf l2C bu s specification pdf The SHTC1 comes in a 4 pin package see Table 7 Supply voltage SHTC1 Serial clock bidirectional Serial data bidirectional Table 7 SHTC1 pin assignment top view The center pad is internally connected to VSS Power supply pins supply voltage VDD and ground VSS must be decoupled with a 100 nF capacitor that shall be placed as close to the sensor as possible see Figure 6 SCL is used to synchronize the communication between microcontroller and the sensor The master must keep the clock frequency within 0 to 400 kHz as specified in Table 6 The SHTC1 may pull down the SCL line when clock stretching is enabled The SDA pin is used to transfer data in and out of the sensor For safe communication the timing specifications defined in the 12C manual must be met To avoid signal contention the microc
14. e measurement cycle is presented in Figure 7 With the acknowledgement of the measurement command the SHTC1 starts measuring humidity and temperature 5 4 Sensor Behavior during Measurement and Clock Stretching In general the sensor does not respond to any l C activity during measurement i e C read and write headers are not acknowledged NACK However when clock stretching has been enabled by using a corresponding measurement command the sensor responds to a read header with an ACK and subsequently pulls down the SCL line until the measurement is complete As soon as the measurement is complete the sensor starts sending the measurement results During measurement the sensor has a current consumption according to Table 3 For best possible repeatability of humidity and temperature measurements it is recommended to avoid any communication on the I2C bus while the SHTC1 is measuring For more information see application note SHTC1 Optimization of Repeatibility 5 5 Readout of Measurement Results After a measurement command has been issued and the sensor has completed the measurement the master can read the measurement results by sending a START condition followed by an I C read header The sensor will acknowledge the reception of the read header and send two bytes of data followed by one byte CRC checksum and another two bytes of data followed by one byte CRC checksum Each byte must be acknowledged by the microcont
15. eeseeetseeeeeeteeeeen 4 4 Interface SpecificationS cece 6 5 Operation and COMMUNICATION i 6 EN 9 1 Packaging and Traceability nn 9 8 Ordering Information 0 9 9 Technical DrawingS 10 10 Further Information ns 12 Important NoticeS 14 www sensirion com Version 3 May 2014 SENSIRION THE SENSOR COMPANY The sensor covers a humidity measurement range of 0 to 100 RH and a temperature measurement range of 30 to 100 C with a typical accuracy of 3 RH and 0 3 C The operation voltage of 1 8 V and an energy budget below 1 uJ per measurement make the SHTC1 suitable for mobile or wireless applications running on the tightest power budgets With the industry proven quality and reliability of Sensirion s humidity and temperature sensors and constant accuracy over a large measurement range the SHTC1 offers an unprecedented performance to price ratio Tape and reel packaging together with suitability for standard SMD assembly processes make the SHTC1 predestined for high volume applications Block diagram Signal conditioning Signal conditioning analog digital Data processing and system control Calibration mem I2C interface VDD VSS SDA SCL Figure 1 Functional block diagram of the SHTC1 1 14 SENSIRION THE SENSOR COMPANY 1 Humidity and Temperature Sensor Specifications Relative Humidity Typ RH Accuracy tolerance Repeatabily 01 ARH Resous o0 uR heess o a OR Responsetmes c
16. ended 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 ESD Latchup and EMC 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 e 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 Laubisruetistr 50 CH 8712 Staefa ZH Switzerland www sensirion com Phone 41 44 306 40 00 Fax 41 44 306 40 30 info sensirion com Www sensirion com info sensirion co jp www sensirion co jp Sensirion AG Germany Phone 41 44927 11 66 info sensirion com www sensirion com Www sensirion com Phone 1 805 409 4900 info_us sensirion com Sensirion Japan Co Ltd
17. ge 30 to 100 C Longte Typ lt 002 Table 2 Temperature sensor specifications p TI p AT C 2 Maximum Accuracy 415 Typical Accuracy Temperature C Figure 3 Typical and maximal tolerance for temperature sensor in C 8 Temperature response time depends on heat conductivity of sensor substrate and design in of sensor in application 9 Max value is lt 0 04 C y Version 3 May 2014 2 14 SENSIRION THE SENSOR COMPANY 1 2 Recommended Operating Conditions 1 1 RH Accuracy at Various Temperatures The sensor shows best performance when operated within Typical RH accuracy at 25 C is defined in Figure 2 For recommended normal temperature and humidity range of other temperatures typical accuracy has been evaluated 5 60 C and 20 80 RH respectively Long term to be as displayed in Figure 4 exposure to conditions outside normal range especially at 100 high humidity may temporarily offset the RH signal e g 90 3 RH after 60h at gt 80 RH After returning into the a 80 normal temperature and humidity range the sensor will 70 slowly come back to calibration state by itself Prolonged 60 exposure to extreme conditions may accelerate ageing 5 j To ensure stable operation of the humidity sensor the Za conditions described in the document SHTxx Assembly of SMD Packages section Storage and Handling on Instructions regarding exposure to vola
18. ions sensors sensirion Humidity Sensor Specification Statement Table 15 Documents containing further information relevant for the SHTC1 www sensirion com Version 3 May 2014 12 14 SENSIRION THE SENSOR COMPANY Revision History Date Version Pagel euay22 am o May 21 2013 2 68 Section 5 2 1 removed stop condition added to fig 6 May 23 2014 3 1 4 7 9 11 IRH accuracy at various temperatures added MSL added ordering information 12 added metal land pattern added minor adjustments www sensirion com Version 3 May 2014 13 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 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 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 unint
19. ll operating parameters including without limitation recommended parameters must be validated for each customer s applications by customers 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 2014 by SENSIRION CMOSens is a trademark of Sensirion All rights reserved Sensirion Korea Co Ltd Phone 82 31 337 7700 3 info sensirion co kr www sensirion co kr Sensirion China Co Ltd Phone 86 755 8252 1501 info sensirion com cn WWww sensirion com cn To find your local representative please visit www sensirion com contact Version 3 May 2014 14 14 SENSE THE SENSOR COMPANY Shenzhen Sense IoT Technology Co Ltd IC
20. oe 8 s Table 1 Humidity sensor specifications ARH RH 10 Maximum accuracy 8 Typical Accuracy 0 10 20 30 40 50 60 70 80 90 100 Relative humidity RH Figure 2 Typical and maximal tolerance for relative humidity in RH at 25 C 1 For definition of typ and max accuracy tolerance please refer to the document Sensirion Humidity Sensor Specification Statement 2 The stated repeatability is 3 times the standard deviation 30 of multiple consecutive measurement values at constant conditions and is a measure for the noise on the physical sensor output 3 Resolution of A D converter 4 Specified range refers to the range for which the humidity or temperature sensor specification is guaranteed For details about recommended humidity and temperature operating range please refer to section 1 1 6 Time for achieving 63 of a humidity step function valid at 25 C and 1 m s airflow Humidity response time in the application depends on the design in of the sensor T Typical value for operation in normal RH T operating range Max value is lt 0 5 RH y Value may be higher in environments with vaporized solvents out gassing tapes adhesives packaging materials etc For more details please refer to Handling Instructions www sensirion com Temperature Conditions Value Uni Parameter Typ 0 C Accuracy tolerance1 typ w C Max see Figure 3 eal Specified ran
21. ontroller must only drive SDA and SCL low External pull up resistors e g 10 KQ are required to pull the signal high For dimensioning resistor sizes please take bus capacity requirements into account It should be noted that pull up resistors may be included in I O circuits of microcontrollers 9 CD ae 2 du 004 Figure 6 Typical application circuit including pull up resistors Rp and decoupling of VDD and VSS by a capacitor www sensirion com SENSIRION THE SENSOR COMPANY For good performance of the SHTC1 in the application it is important to know that the center pad of the SHTC1 offers the best thermal contact to the temperature sensor For more information on design in please refer to the document SHTxx Design Guide For mechanical reasons the center pad should be soldered Electrically the center pad is internally connected to GND and may be connected to the GND net on the PCB or left floating 5 Operation and Communication All commands and memory locations of the SHTC1 are mapped to a 16 bit address space which can be accessed via the 12C protocol Sea Table 8 SHTC1 2C device address 5 1 Power Up and Communication Start Upon VDD reaching the power up voltage level Vpor the SHTC1 enters idle state after a duration of tpu In idle State the SHTC1 is ready to receive commands from the master microcontroller Each transmission sequence begins with START condition S and ends
22. roller with an ACK condition for the sensor to continue sending data If the SHTC1 does not receive an ACK from the master after any byte of data it will not continue sending data Whether the sensor sends out humidity or temperature data first depends on the measurement command that was sent to the sensor to initiate the measurement see Table 9 The 12C master can abort the read transfer with a NACK condition after any data byte if it is not interested in subsequent data e g the CRC byte or the second measurement result in order to save time Www sensirion com SENSIRION THE SENSOR COMPANY In case the user needs humidity and temperature data but does not want to process CRC data it is recommended to read the first two bytes of data with the CRC byte without processing the CRC data and abort the read transfer after reading the second two data bytes with a NACK This procedure is more time efficient than starting two different measurements and aborting the read transfer after the first two data bytes each time 5 6 Soft Reset The SHTC1 provides a soft reset mechanism that forces the system into a well defined state without removing the power supply If the system is in idle state i e if no measurement is in progress the soft reset command can be sent to SHTC1 according to Figure 8 This triggers the sensor to reset all internal state machines and reload calibration data from the memory Software reset 0x805D 1000 0000
23. tile organic compounds have to be met Please note as well that this does apply not only to transportation and manufacturing 0 10 20 30 40 50 60 70 80 but also to operation of the SHTC1 Temperature C Figure 4 Typical accuracy of relative humidity measurements given in RH for temperatures 0 80 C 2 Electrical Specifications 2 1 Electrical Characteristics Default conditions of 25 C and 1 8 V supply voltage apply to values in the table below unless otherwise stated swyg ww li i lv Poweruplown ove Ver Satopowersippy 105 12 13 vb deste SSS 7 22 fk Measurement 385 465 UA pvrage oem SUPUN while sensor is measuring Supply current Average current consumption Average 4 8 HA continuous operation with one measurement per second Average power consumption Average power Sone consumotion Average HW continuous operation with one i measurement per second ea aa ee oo Lowleveoubutvolage Vo SmAsinkowrent IT Table 3 Electrical specifications 10 These values can be reduced by using the low power measurement mode see separate application note www sensirion com Version 3 May 2014 3 14 SENSIRION THE SENSOR COMPANY 2 2 Absolute Maximum Ratings Stress levels beyond those listed in Table 4 may cause permanent damage to the device These are stress ratings only and functional operation of the device at these conditions cannot be guaranteed Exposure to the absolute maximum rating condi
24. tions for extended periods may affect the reliability of the device Table 4 Absolute maximum ratings 3 Timing Specifications 3 1 Sensor System Timings Default conditions of 25 C and 1 8 V supply voltage apply to values the table below unless otherwise stated Max values are measured at 30 C and 1 98V si fans Time between Von reaching VPU Time between ACK of soft reset Soft reset time After soft reset command and sensor entering Measurement duration MEAS 10 8 14 4 OU temperature measurement 2 Table 5 System timing specifications 11 The recommended storage temperature range is 10 50 C Please consult the document SHTxx Handling Instructions for more information 12 These values can be reduced by using the low power measurement mode see separate application note www sensirion com Version 3 May 2014 4 14 SENSIRION THE SENSOR COMPANY 3 2 Communication Timings Default conditions of 25 C and 1 8 V stb voltage apply to values in the table below unless otherwise stated ol mm eeo Hold time repeated START After this period the first we 3 DDA asf fof ae e Seta time for a repeated fay S START condition j saime wr o PP SDAsetuptine fw ml e SCUSDATsetme h o oo o 20 amwe hl e DA valid time tvp DAT Set up time for STOP condition apacitive load on bus line Cp tsu STO 1 fscL tHIGH tLow tr tF DATA OUT CC ie i 30 Figure 5 Timing diagram for digit
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