SHT33-DIS SENSIRION | Alldatasheet
Document overview
- PDF pages: 26
Technical content
Datasheet sections
- 1 Humidity and Temperature Sensor Specifications
- 1.1 Relative Humidity
- 1.2 Temperature
- 1.3 Recommended Operating Conditions
- 1.4 ISO17025 certification with 3-point calibration data
- 2 Electrical Specifications
- 2.1 Electrical Characteristics
- 2.2 Timings
- 2.3 Absolute Maximum Ratings
- 3 Pin Assignment
- 3.1 Power Pins (VDD,VSS)
- 3.2 Serial Clock and Serial Data (SCL, SDA)
- 3.3 Die Pad (center pad)
- 3.4 ADDR Pin
- 3.5 ALERT Pin
- 4 Sensor Operation
- 4.1 Power-Up and Communication Start
- 4.2 Starting a Measurement
- 4.3 Measurement Commands for Single Shot Data Acquisition Mode
- 4.4 Readout of Measurement Results for Single Shot Mode
- 4.5 Measurement Commands for Periodic Data Acquisition Mode
- 4.6 Readout of Measurement Results for Periodic Mode
- 4.7 ART Command
- 4.8 Break command / Stop Periodic Data Acquisition Mode
- 4.9 Reset
- 4.10 Heater
- 4.11 Serial Number
- 4.12 Status Register
- 4.13 Checksum Calculation
- 4.14 Conversion of Signal Output
- 4.15 Communication Timing
- 5 Physical Specification
- 5.1 Package Description
Features
- Accuracies ±2.0 %RH, ±0.48 °C
- VDD = 2.15 V…5.5 V
- Low drift, <0.01 °C per year
- Sensor-specific calibration certificate acc. to ISO 17025 : 2017, 3-point temp. calibration
- JEDEC JESD47 qualification
- Operating range: 0…100 %RH, −40…125°C
- Fully functional in a condensing environment
- True NIST-traceability
- Unique serial number
- I2C FM, CRC checksum, multip. I2C addr.
- Tiny 8-pin DFN package with ALERT pin General Description The SHT33-DIS is part of Sensirion’s new family of low drift digital calibrated and ISO17025 certified sensors, combining ISO17025 certified temperature and highly accurate humidity sensing in a single package. It relies on the industry proven CMOSens® technology, enabling increased computational power, reliability and improved accuracy specifications compared to its predecessors. Its functionality includes enhanced signal processing, two distinctive and user selectable I2C addresses and communication speeds of up to 1 MHz. The DFN package has a footprint of 2.5 x 2.5 mm2 with a height of 0.9 mm. Every SHT33 can be identified by its unique serial number and is supplied with a ISO17025 accredited calibration certificate for the temperature measurement. The calibration certificate comprises three temperatures, −30 °C, 5 °C, and 70 °C. In terms of communication, electrical specifications, and footprint, the SHT33 -DIS is fully identical with the SHT3x-DIS. Device Overview Functional Block Diagram Products Details SHT33-DIS ISO17025 3-point calibration certificate Full product list on page 24 SCAN ME to give feedback and help us to improve this document. —Thank you! nRESET AlertSDA SCLADDR Power on Reset Alert Logic RESET Digital Interface RH Sensor T Sensor Data processing & Linearization ADCADC Calibration Memory VSS VDD VSS VDD
www.sensirion.com / D1 Version 1 – December 2022 3/26
1 Humidity and Temperature Sensor Specifications
1.1 Relative Humidity
Table 1. General relative humidity sensor specifications. Figure 1. Maximal and typical tolerance of RH at 25°C 3 Valid for 25 °C and 50 %RH. 4 Resolution of A/D converter. 5 Specified range refers to the range for which the humidity or temperature sensor specification is guaranteed. 6 For details about recommended humidity and temperature operating range, please refer to section 1.3. 8 With activated ART function (see section 4.7 ) the response time can be improved by a factor of two.
1.2 Temperature
Table 2. General temperature sensor specifications.
1.3 Recommended Operating Conditions
and Handling Instructions” regarding exposure to volatile organic compounds have to be met. 10 Temperature response time depends on heat conductivity of sensor substrate and design-in of sensor in application. Figure 2. Maximal temperature accuracy. The green lines represent the calibration points for ISO-17025.
1.4 ISO17025 certification with 3-point calibration data
to the SAS are given in Table 3. institutes, according to the CIPM Mutual Recognition Arrangement (CIPM MRA). automated systems. For detailed documentation, kindly refer to the Libellus documentation. Table 3. Measurement uncertainty and decision rule for the accredited calibration according to Swiss
2 Electrical Specifications
Valid for all electrical specifications: Typical values correspond to VDD = 3.3 V and T = 25 °C. Min. and are based on characterization.
2.1 Electrical Characteristics
Table 4. Electrical specifications, typical values T = 25°C, min. & max. values T = −40 °C … 125 °C
2.2 Timings
Table 5. System timing specification, valid from −40 °C to 125 °C and 2.4 V … 5.5 V. Table 6. System timing specification, valid from −40 °C to 125 °C and 2.15 V … <2.4 V.
2.3 Absolute Maximum Ratings
conditions is not guaranteed. Ratings are only tested each at a time. Table 7. Minimum and maximum ratings, voltages may only be applied for short time periods. 11 According to ANSI/ESDA/JEDEC JS-001-2014; AEC-Q100-002. 12 According to ANSI/ESD S5.3.1-2009; AEC-Q100-011.
3 Pin Assignment
The SHT33-DIS comes in a 8-pin DFN package – see Table 8.
1 SDA Serial data; input / output
2 ADDR Address pin; input; connect to either logic high or low, do not leave
3 ALERT Indicates alarm condition; output; must be left floating if unused
4 SCL Serial clock; input / output
5 VDD Supply voltage; input
7 R No electrical function; to be connected to VSS
8 VSS Ground
Table 8. SHT33-DIS pin assignment (transparent top view). Dashed lines are only visible if viewed from below. The die pad is internally connected to VSS.
3.1 Power Pins (VDD,VSS)
Figure 3 for a typical application circuit.
3.2 Serial Clock and Serial Data (SCL, SDA)
to I2C Standard 13 are supported. The SDA pin is used to transfer data to and from the sensor. Communication with frequencies up to 400 kHz must meet the I2C Fast Mode 13 standard.
- Both SCL and SDA lines are open -drain I/Os with diodes to VDD and VSS. They should be
note that the positioning of the pins does not reflect the position on the real sensor (see Table 8).). A device on the I2C bus must only drive a line to ground. The external pull -up resistors ( e.g.
Figure 3. Typical application circuit. Please note that the positioning of the pins does not reflect the position on the real sensor (see Table 8).
3.3 Die Pad (center pad)
3.4 ADDR Pin
I2C Read/Write header constitute the I2C Address. Table 9. I2C device addresses.
3.5 ALERT Pin
Pin is only used to switch a transistor.
4 Sensor Operation
minimal waiting time of 1 ms is needed before another command can be received by the sensor. read direction it is left to the master to read and process the checksum.
4.1 Power-Up and Communication Start
Table 4. After reaching this threshold voltage the sensor needs the time tPU to enter idle state. Once cannot be controlled by the user.
4.2 Starting a Measurement
Table 10. With the acknowledgement of the measurement command, the SHT33-DIS starts measuring humidity and temperature.
4.3 Measurement Commands for Single Shot Data Acquisition Mode
Table 10. They differ with respect to repeatability (low, medium and high) and clock stretching overall energy consumption of the sensor. This is explained in section 2.
Table 10. Measurement commands in single shot mode. The first “SCL free” block indicates a minimal waiting time of 1 ms. (Clear blocks are controlled by the microcontroller, grey blocks by the sensor).
4.4 Readout of Measurement Results for Single Shot Mode
the two humidity bytes, the read transfer can be aborted with a with a NACK. header with a not acknowledge (NACK), if no data is present. SCL line and sends the measurement results.
4.5 Measurement Commands for Periodic Data Acquisition Mode
consists of one 16-bit temperature and one 16-bit humidity value (in this order). ongoing measurement and enter the single shot mode. Table 11. Measurement commands for periodic data acquisition mode (Clear blocks are controlled by the
4.6 Readout of Measurement Results for Periodic Mode
Table 12. If no measurement data is present the I2C read header is r esponded with a NACK (Bit issued, the data memory is cleared, i.e. no measurement data is present.
Table 12. Fetch Data command (Clear blocks are controlled by the microcontroller, grey blocks by the
4.7 ART Command
- After issuing the ART command the sensor will start acquiring data wit h a frequency of 4 Hz.
Table 13. Command for a periodic data acquisition with the ART feature (Clear blocks are controlled by the microcontroller, grey blocks by the sensor).
4.8 Break command / Stop Periodic Data Acquisition Mode
The periodic data acquisition mode can be stopped using the break command shown in Table 14. sensor will abort the ongoing measurement and enter the single shot mode. This takes 1 ms. Table 14. Break command (Clear blocks are controlled by the microcontroller, grey blocks by the sensor).
4.9 Reset
recommended to use the nRESET pin of the SHT33-DIS. register preserves its content. Table 15. Soft reset command (Clear blocks are controlled by the microcontroller, grey blocks by the sensor). command consists of two bytes and is shown in Table 16. Table 16. Reset through the general call address (Clear blocks are controlled by the microcontroller, grey
low for a minimum of 1 µs to generate a reset of the sensor. and 2 (ADDR) also needs to be removed.
4.10 Heater
disabled (default condition). Table 17. Heater command (Clear blocks are controlled by the microcontroller, grey blocks by the sensor).
4.11 Serial Number
number with a length of 32 bit. This serial number can be used to individually identify each sensor. Table 18. Command to read out the serial number (Clear block are controlled by microcontroller, grey blocks
4.12 Status Register
Table 19. Command to read out status register (Clear block are controlled by microcontroller, grey blocks by
14 Reserved ‘0’
12 Reserved ‘0’
Table 20. Description of the status register.
Table 21. Command to clear the status register (Clear blocks are controlled by the microcontroller, grey
4.13 Checksum Calculation
Table 22. I2C CRC properties.
4.14 Conversion of Signal Output
raw values into a physical scale can be achieved using the following formulas. work only correctly when SRH and ST are used in decimal representation.
4.15 Communication Timing
Table 23. Timing specifications for I2C communication, valid for T = −40 °C … 125 °C & VDD = VDDmin … VDDmax. The nomenclature above is according to the I2C (UM10204, Rev. 6, April 4, 2014). Figure 4. Timing diagram for digital input/output pads. SDA directions are seen from the sensor. Bold SDA valid read time is triggered by falling edge of preceding toggle.
5 Physical Specification
5.1 Package Description
are diced and therefore these diced lead frame surfaces are not covered with the respective plating.
- SHT33-DIS has a Moisture Sensitivity Level (MSL) of 1, according to IPC/JEDEC J -STD-
- At the same time, it is recommended to further process the sensors within 1 year after date of
5.2 Traceability
the output mode. The third letter (A) represents the manufacturing year (4 = 2014, 5 = 2015, etc). Figure 6 through the labels T1 & T2. Figure 5. Top view of the SHT33-DIS illustrating the laser marking.
5.3 Package Outline
Figure 6. Dimensional drawing of SHT33-DIS sensor package tolerances, including displacement tolerances. Typically the opening will be smaller. Table 24. Package outline.
5.4 Land Pattern
Packages [1], which can be found on the Sensirion webpage.
6 Quality and Material Contents
Figure 7. Recommended metal land pattern (left) and stencil apertures (right) for SHT33-DIS. The apertures (right) are indicated through the shaded areas.
7 Shipping Package
Figure 8. Technical drawing of the packaging 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.
- 10 SPROCKET HOLE PITCH CUMULATIVE TOLERANCE ±0.2
- POCKET POSITION RELATIVE TO SPROCKET HOLE MEASURED
- A0 AND B0 ARE CALCULATED ON A PLANE AT A DISTANCE "R"
4.00 SEE Note 1
8 Product Nomenclature
Table 25. SHT33 product name nomenclature.
9 Ordering Information
Table 26. SHT33-DIS ordering options.
10 Bibliography
[1] Sensirion, ""SHTxx Assembly of SMD Packages"," [Online]. Available: www.sensirion.com. [2] NXP Semiconductors, "User manual UM10204," vol. Rev. 6, 2014. [3] Sensirion, "SHTxx Design Guide," [Online]. Available: www.sensirion.com. [4] Sensirion, "Handling Instructions for Humidity Sensors," 2020. [6] Sensirion, "Sensirion Humidity Sensor Specification Statement," [Online]. Available: www.sensirion.com.
www.sensirion.com / D1 Version 1 – December 2022 25/26 Date Version Page(s) Changes February 2021 0.1 all Initial preliminary release December 2022 1 all Reformatting and first final release
www.sensirion.com / D1 Version 1 – December 2022 26/26 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 re sult 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 instructio ns 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, dam ages and expenses, and reasonable attorney fees arising o ut 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 “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 del ivery that this product shall be of the quality, material and workmanship defined in SENSIRION’s pub lished 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:
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- 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 N O 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. All operating parameters, including without limitation recommended parameters, must be validated for each customer’s applications by customer’s technical experts. Recommended parameters can an d 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 © 2022, by SENSIRION. CMOSens® is a trademark of Sensirion. All rights reserved Headquarters and Subsidiaries Sensirion AG Laubisruetistr. 50 CH-8712 Staefa ZH Switzerland phone: +41 44 306 40 00 fax: +41 44 306 40 30 info@sensirion.com www.sensirion.com Sensirion Inc., USA 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.com/kr Sensirion Japan Co. Ltd. phone: +81 3 3444 4940 info-jp@sensirion.com www.sensirion.com/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