Datasheet SHT3x digital
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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 to 5.5 V I2C Interface with communication speeds up to 1 MHz and two user selectable addresses Typical accuracy of 2%RH and 0.3°C Very fast start-up and measurement time Tiny 8-Pin DFN package Product Summary SHT3x-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. The 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. The DFN package has a footprint of 2.5 x 2.5 mm while keeping a height of 0.9 mm. This allows for integration of the SHT3x-DIS into a great variety of applications. Additionally, the wide supply voltage range of 2.4 to 5.5 V guarantees compatibility with diverse assembly situations. All in all, the SHT3x-DIS incorporates 15 years of knowledge of Sensirion, the leader in the humidity sensor industry. Benefits of Sensirion’s CMOSens® Technology High reliability and long-term stability Industry-proven technology with a track record of more than 15 years High process capability Designed for mass production Calibration Memory Data processing & Linearization Digital Interface ADDR Alert Logic Alert Figure 1 Functional block diagram of the SHT3x-DIS. The sensor signals for humidity and temperature are factory calibrated, linearized and compensated for temperature and supply voltage dependencies.

Sensor Performance Humidity Sensor Performance SHT31 Accuracy tolerance1 Repeatability2 Resolution Hysteresis Specified range3 Response time5 Long-term drift Table 1 Humidity sensor specification maximal tolerance typical tolerance Figure 3 Typical tolerance of RH over T for SHT30 1 For definition of typical 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...

DRH (%RH) maximal tolerance typical tolerance Figure 5 Typical tolerance of RH over T for SHT31

Temperature Sensor Performance Parameter Accuracy Repeatability2 Resolution Specified Range Response time 8 Long Term Drift Table 2 Temperature sensor specification DT (°C) ±2.0 maximal tolerance typical tolerance Figure 6 Tolerance of the temperature sensor in °C for SHT30 and SHT31 Recommended Operating Condition The sensor shows best performance when operated within recommended normal temperature and humidity range of 5 – 60 °C and 20 – 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...

Specifications Electrical Specifications Parameter Supply voltage Power-up/down level Slew rate change of the supply voltage Heater power Voltage changes on the VDD line between VDD V/ms min and VDD max should be below the maximum slew rate Current when sensor is A not performing a measurement Current when sensor is A not performing a measurement Current consumption A while sensor is measuring, Current consumption (operation with one A measurement per second at lowest repeatability) Alert Output driving strength Not measuring periodic data acquisition mode IDD Not measuring single shot mode...

Absolute Minimum and Maximum Ratings Stress levels beyond those listed in Table 5 may cause permanent damage to the device or affect the reliability of the sensor. These are stress ratings only and functional operation of the device at these conditions cannot be guaranteed. Parameter Supply voltage VDD -0.3 to 6 V Max Voltage on pins (pin 1 (SDA); pin 2 -0.3 to VDD+0.3 V (ADDR); pin 3 (ALERT); pin 4(SCL); pin 6(nRESET)) Input current on any pin ±100 mA Operating temperature range -40 to 125 °C Storage temperature range -40 to 150 °C ESD HBM (human body model) 4 kV ESD CDM (charge device...

The SHT3x-DIS comes in a tiny 8-pin DFN package – see Table 6. Name Serial data; input / output Address pin; input; connect to either VDD or VSS, do not leave floating Indicates alarm condition; output; must be left floating if unused Serial clock; input / output Supply voltage; input Reset pin active low; Input; if not used it is recommended to connect to VDD No electrical function; recommended to connect to VSS Ground Serial Clock and Serial Data (SCL, SDA) SCL is used to synchronize the communication between microcontroller and the sensor. The clock frequency can be freely chosen between...

Condition ADDR (pin 2) connected to VSS ADDR (pin 2) connected to VDD Table 7 I2C device address The alert pin may be used to connect to the interrupt pin of a microcontroller. The output of the pin depends on the value of the RH/T reading relative to programmable limits. Its function is explained in a separate application note. If not used, this pin must be left floating. The pin switches high, when alert conditions are met. The maximum driving loads are listed Table 3. Be aware that self-heating might occur, depending on the amount of current that flows. Self-heating can be prevented if...

The SHT3x-DIS supports I2C fast mode (and frequencies up to 1000 kHz). Clock stretching can be enabled and disabled through the appropriate user command. For detailed information on the I2C protocol, refer to NXP I2C-bus specification9. All SHT3x-DIS commands and data are mapped to a 16bit address space. Additionally, data and commands are protected with a CRC checksum. This increases communication reliability. The 16 bits commands to the sensor already include a 3 bit CRC checksum. Data send from and received by the sensor is always succeeded by an 8 bit CRC. In write direction it is...