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Datasheet SHT3x-DIS Humidity and Temperature Sensor  Fully calibrated, linearized, and temperature compensated digital output  Wide supply voltage range, from 2.4 V to 5.5 V  I2C Interface with communication speeds up to 1 MHz and two user selectable addresses  Typical accuracy of  1.5 % RH and  0.2 °C for SHT35  Very fast start-up and measurement time  Tiny 8-Pin DFN package Product Summary SHT 3x-DIS is the next generation of Sensirion’s temperature and humidity sensors. It builds on a new CMOSens® sensor chip that is at the heart of Sensirion’s new humidity and temperature platform. T he SHT3x-DIS has increased intelligence, reliability and improved accuracy specifications compared to its predecessor. Its functionality includes enhanced signal processing, two distinctive and user selectable I2C addresses and communication speeds of up to 1 MHz. T he DFN Benefits of Sensirion’s CMOSens® Technology  High reliability and long-term stability  Industry-proven technology with a track record of more than 15 years  Designed for mass production  High process capability  High signal-to-noise ratio Content 1 Sensor Performance .................................................. 2 2 3 Specifications .............................................................. 6 Pin Assignment........................................................... 8 4 Operation and Communication ................................ 9 5 6 Packaging ..................................................................15 Shipping Package ....................................................17 7 Quality ........................................................................18 8 Ordering Information ................................................18 package has a footprint of 2.5 x 2.5 mm2 while keeping a height of 0.9 mm. T his allows for integration of the SHT 3x-DIS into a great variety of applications. Additionally, the wide supply voltage range of 2.4 V to 5.5 V guarantees compatibility with diverse assembly situations. All in all, the SHT 3x-DIS incorporates 15 years of knowledge of Sensirion, the leader in the humidity sensor industry. Figure 1 Functional block diagram of the SHT3x-DIS. The sensor signals for humidity and temperature are factory calibrated, for temperatur e and supply voltage dependencies. linearized and compensated www.sensirion.com August 2016 - Version 3 1/20 nRESETAlertSDASCLADDRPower on ResetAlert LogicRESETDigital InterfaceRH SensorT SensorData processing& LinearizationADCADCCalibration MemoryVSSVDDVSSVDD

Condition Typ. Max. Typ. Max. Typ. Max. Low Medium High Typ. at 25°C extended4 63% Typ.7 Value 3 Figure 2 2 Figure 3 ±1.5 Figure 4 0.25 0.15 0.10 0.01 0.8 0 to 100 86 <0.25 Units % RH - % RH - % RH - % RH % RH % RH % RH % RH % RH s % RH/yr Condition Value Units typ., 0°C to 65°C typ., -40°C to 90°C typ., -40°C to 90°C Low Medium High Typ. - 63% max 0.3 0.3 ±0.2 0.24 0.12 0.06 0.015 -40 to 125 >2 <0.03 °C °C °C °C °C °C °C °C s °C/yr Datasheet SHT3x-DIS 1 Sensor Performance Humidity Sensor Specification Parameter SHT30 Accuracy tolerance1 SHT31 Accuracy tolerance1 SHT35 Accuracy tolerance1 Repeatability2 Resolution Hysteresis Specified range3 Response time5 Long-term drift Table 1 Humidity sensor specification. Temperature Sensor Specification Parameter SHT30 Accuracy tolerance1 SHT31 Accuracy tolerance1 SHT35 Accuracy tolerance1 Repeatability2 Resolution Specified Range Response time 8 Long Term Drift Table 2 Temperature sensor specification . 1 For definition of ty pical and maximum accuracy tolerance, please refer to the document “Sensirion Humidity Sensor Specification Statement”. 2 The stated repeatability is 3 times the standard deviation (3σ) of multiple consecutive measurements at the stated repeatability and at constant ambient conditions. It is a measure for the noise on the phy sical sensor output. Different measurement modes allow for high/medium/low repeatability. 3 Specified range refers to the range for w hich the humidity or temperature sensor specification is guaranteed. 4 For details about recommended humidity and temperature operating range, please refer to section 1.1. 5 Time for achiev ing 63% of a humidity step function, valid at 25°C and 1m/s airflow. Humidity response time in the application depends on the design-in of the sensor. 6 With activ ated ART function (see section 4.7) the response time can be improved by a factor of 2. 7 Ty pical value for operation in normal RH/T operating range, see section 1.1. Maximum value is < 0.5 %RH/yr. Higher drift values might occur due to contaminant env ironments with vaporized solvents, out-gassing tapes, adhesives, packaging materials, etc. For more details please refer to Handling Instructions. 8 Temperature response times strongly depend on the ty pe of heat ex change, the av ailable sensor surface and the design environment of the sensor in the final application. www.sensirion.com August 2016 - Version 3 2/20

Datasheet SHT3x-DIS Humidity Sensor Performance Graphs maximal tolerance typical tolerance DRH (%RH) ±8 ±6 ±4 ±2 ±0 ±8 ±6 ±4 ±2 ±0 DRH (%RH) maximal tolerance typical tolerance 0 10 20 30 40 50 SHT30 70 60 100 Relative Humidity (%RH) 80 90 0 10 20 30 40 50 SHT31 70 60 100 Relative Humidity (%RH) 90 80 Figure 2 Tolerance of RH at 25°C for SHT30. Figure 3 Tolerance of RH at 25°C for SHT31. maximal tolerance typical tolerance DRH (%RH) ±6 ±4 ±2 ±0 0 10 20 30 40 50 SHT35 70 60 100 Relative Humidity (%RH) 80 90 Figure 4 Tolerance of RH at 25°C for SHT35. www.sensirion.com August 2016 - Version 3 3/20

Datasheet SHT3x-DIS RH (%RH) SHT30 100 ±4.5 ±4.5 ±4.5 ±4.5 ±4.5 ±4.5 ±4.5 ±4.5 ±4.5 ±3 90 ±3 80 ±3 ±3 ±3 70 ±3 ±3 60 ±3 ±3 50 ±3 ±3 40 ±3 30 ±3 ±3 ±3 20 ±3 10 ±3 ±3 0 ±4.5 ±4.5 ±4.5 ±4.5 ±4.5 ±4.5 ±4.5 ±4.5 ±4.5 80 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 60 70 10 20 30 40 50 0 RH (%RH) 100 ±2 90 ±2 80 ±2 70 ±2 60 ±2 50 ±2 40 ±2 30 ±2 20 ±2 10 ±2 0 ±2 0 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 10 SHT31 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 20 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 30 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 40 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 50 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 60 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 70 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 80 Temperature (°C) Temperature (°C) Figure 5 Typical tolerance of RH over T for SHT30. Figure 6 Typical tolerance of RH over T for SHT31. SHT35 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 RH (%RH) ±2 ±2 100 ±2 ±2 ±2 90 ±2 ±2 ±2 80 ±2 ±2 70 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±2 ±2 60 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±2 50 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±2 ±2 40 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±2 30 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±2 20 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±2 10 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±2 0 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±1.5 ±2 80 70 60 50 40 10 0 30 20 Temperature (°C) Figure 7 Typical tolerance of RH over T for SHT35. www.sensirion.com August 2016 - Version 3 4/20

Datasheet SHT3x-DIS Temperature Sensor Performance Graphs SHT30 SHT31 DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) ±1.5 ±1.0 ±0.5 ±0.0 maximal tolerance typical tolerance DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) ±1.5 ±1.0 ±0.5 ±0.0 maximal tolerance typical tolerance -40 -20 0 20 40 60 80 100 120 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Figure 8 Temperature accuracy of the SHT30 sensor. Figure 9 Temperature accuracy of the SHT31 sensor. Temperature (°C) SHT35 maximal tolerance typical tolerance DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) DT (°C) ±1.5 ±1.0 ±0.5 ±0.0 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Figure 10 Temperature accuracy of the SHT35 sensor. www.sensirion.com August 2016 - Version 3 5/20

Datasheet SHT3x-DIS 1.1 Recommended Operating Condition T he sensor shows best performance when operated within recommended normal temperature and humidity range of 5 °C – 60 °C and 20 %RH – 80 %RH, respectively. Long-term exposure to conditions outside normal range, especially at high humidity, may temporarily offset the RH signal (e.g. +3%RH after 60h kept at >80%RH). After returning into the normal temperature and humidity range the sensor will slowly come back to calibration state by itself. Prolonged exposure to extreme conditions may accelerate ageing. T o ensure stable operation of the humidity sensor, the conditions described in the document “SHT xx Assembly of SMD Packages”, section “Storage and Handling Instructions” regarding exposure to volatile organic compounds have to be met. Please note as well that this does a pply not only to transportation and manufacturing, but also to operation of the SHT 3x-DIS. 2 Specifications 2.1 Electrical Specifications Parameter Symbol Condition Min. T yp. Max. Units Comments Supply voltage Power-up/down level VDD VPOR Slew rate change of the supply voltage VDD,slew Supply current IDD idle state (single shot mode) idle state (periodic data acquisition mode) Measuring Average 2.4 2.1 3.3 2.3 5.5 2.4 V V - - - - - - 20 V/ms 0.2 2.0 A 45 70 A 800 1500 A 2 - A Voltage changes on the VDD line between VDD,min and VDD,max should be slower than the maximum slew rate; faster slew rates may lead to reset; Current when sensor is not performing a measurement during single shot mode Current when sensor is not performing a measurement during periodic data acquisition mode Current consumption while sensor is measuring Current consumption (operation with one measurement per second at lowest repeatability, single shot mode) Alert Output driving strength IOH 0.8x VDD 1.5x VDD 2.1x VDD mA See also section 3.5 Heater power PHeater Heater running 4.5 - 33 mW Depending on the supply voltage Table 3 Electrical specifications, valid at 25°C. www.sensirion.com August 2016 - Version 3 6/20

Datasheet SHT3x-DIS 2.2 Timing Specification for the Sensor System Parameter Symbol Conditions Min. T yp. Max. Units Comments Power-up time tPU After hard reset, VDD ≥ VPOR Soft reset time tSR After soft reset. Duration of reset pulse tRESETN tMEAS,l Low repeatability Measurement duration tMEAS,m Medium repeatability tMEAS,h High repeatability - - 1 - - - 0.5 0.5 - 2.5 4.5 1 1 - 4 6 12.5 15 ms ms Time between VDD reaching VPOR and sensor entering idle state Time between ACK of soft reset command and sensor entering idle state µs See section 3.6 ms The three repeatability modes ms ms differ with respect to measurement duration, noise level and energy consumption. Table 4 System timing specification, valid from -40 °C to 125 °C and 2.4 V to 5.5 V. 2.3 Absolute Minimum and Maximum Ratings Stress levels beyond those listed in T able 5 may cause permanent damage to the device or affect the reliability of the sensor. T hese are stress ratings only and functional operation of the device at these conditions is not guaranteed. Parameter Supply voltage VDD Max Voltage on pins (pin 1 (SDA); pin 2 (ADDR); pin 3 (ALERT); pin 4 (SCL); pin 6 (nRESET)) Input current on any pin Operating temperature range Storage temperature range ESD HBM (human body model)9 ESD CDM (charge device model)10 Rating -0.3 to 6 -0.3 to VDD+0.3 ±100 -40 to 125 -40 to 150 4 750 Units V V mA °C °C kV V Table 5 Minimum and maximum ratings; voltage values may only be applied for short time periods. 9 According to ANSI/ESDA/JEDEC JS-001-2014; AEC-Q100-002. 10 According to ANSI/ESD S5.3.1-2009; AEC-Q100-011. www.sensirion.com August 2016 - Version 3 7/20

Datasheet SHT3x-DIS 3 Pin Assignment T he SHT 3x-DIS comes in a tiny 8-pin DFN package – see T able 6. Pin Name Comments 1 2 3 4 5 6 7 8 SDA Serial data; input / output ADDR ALERT SCL VDD Address pin; input; connect to either logic high or low, do not leave floating Indicates alarm condition; output; must be left floating if unused Serial clock; input / output Supply voltage; input nRESET Reset pin active low; input; if not used it is recommend to be left floating R No electrical function; to be connected to VSS VSS Ground Both SCL and SDA lines are open-drain I/Os with diodes to VDD and VSS. T hey should be connected to external pull-up resistors (please refer to Figure 11). A device on the I2C bus must only drive a line to ground. T he external pull-up resistors (e.g. Rp=10 kΩ) are required to pull the signal high. For dimensioning resistor sizes please take bus capacity and communication frequency into account (see for example Section 7.1 of NXPs I2C Manual for more details11). It should be noted that pull-up resistors may be included in I/O circuits of microcontrollers. It is recommended to wire the sensor according to the application circuit as shown in Figure 11. Figure 11 Typical application circuit. Please note that the positioning of the pins does not reflect the position on the real sensor. This is shown in Table 6. Table 6 SHT3x-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) T he electrical specifications of the SHT 3x-DIS are shown in T able 3. T he power supply pins must be decoupled with a 100 nF capacitor that shall be placed as close to the sensor as possible – see Figure 11 for a typical application circuit. 3.2 Serial Clock and Serial Data (SCL, SDA) SCL is used to synchronize the communication between microcontroller and the sensor. T he clock frequency can be freely chosen between 0 to 1000 kHz. Commands with clock stretching according to I2C Standard11 are supported. T he SDA pin is used to transfer data to and from the sensor. Communication with frequencies up to 400 kHz must meet standard. Communication frequencies up to 1 Mhz are supported following the specifications given in Table 20. I2C Fast Mode11 the 3.3 Die Pad (center pad) T he die pad or center pad is visible from below and located in the center of the package. It is electrically connected to VSS. Hence electrical considerations do not impose constraints on the wiring of the die pad. However, due to mechanical reasons it is recommended to solder the center pad to the PCB. For more information on design-in, please refer to the document “SHT xx Design Guide”. 3.4 ADDR Pin T hrough the appropriate wiring of the ADDR pin the I2C address can be selected (see T able 7 for the respective addresses). T he ADDR pin can either be connected to VDD or VSS, or it can be used as a selector pin. T his means that the address of the sensor can be changed dynamically during operation by switching the level on the ADDR pin. T he only constraint is that the level has to stay constant starting from the I2C start condition until the communication is finished. T his allows to connect more than two SHT 3x-DIS onto the same bus. The dynamical switching requires individual ADDR lines to the sensors. 11 http://www.nxp.com/documents/user_manual/UM10204.pd f www.sensirion.com August 2016 - Version 3 8/20 12345876VDDRRPP100nFADDR(2)ALERT(3)die padR(7)SDA(1)SCL(4)VDD(5)VSS(8)nRESET(6)

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