SHT40 Digital Temperature Humidity Sensor For Intelligent Buildings Meteorological Monitoring

SHT40 Digital Temperature Humidity Sensor

Product Overview:

• Brand & Model: SHT40 is the fourth-generation digital temperature and humidity sensor launched by Sensirion.
• Features & Advantages: It offers excellent cost-effectiveness, is packaged in tape and reel, and is compatible with standard SMD assembly processes, making it suitable for high-volume applications. Based on the newly optimized CMOSens® chip, it features low power consumption and optimized accuracy specifications.

Performance Parameters:

• Measurement Range:
  • Humidity: 0%RH to 100%RH.
  • Temperature: -40°C to 125°C.
• Measurement Accuracy:
  • Humidity: Typical accuracy is ±1.8%RH.
  • Temperature: Typical accuracy is ±0.2°C.
• Response Time: 8s (to reach 63% response, i.e., tau 63%).
• Supply Voltage: 1.08V to 3.6V. The extended voltage range makes it ideal for mobile and battery-driven applications. In some scenarios, common supply voltages range from 3.3V to 5V.
• Current Consumption: Average bare sensor current is 0.4μA (at a measurement rate of 1Hz), and idle bare sensor current is 80nA. The low power consumption ensures a long service life in battery-powered devices.

Electrical Characteristics:

• Communication Interface: Adopts I2C interface for easy communication with various microcontrollers or microcomputers. It only requires two wires (plus power and ground) for connection, supporting I2C fast mode plus and CRC check.
• I2C Address: The default address is 0x44.

Physical Characteristics:

• Size: Compact design, typically 14×17mm, enabling integration into challenging designs.
• Housing: Equipped with a rugged DFN housing to meet high-reliability requirements and has passed JEDEC JESD47 qualification.

Functional Features:

• Internal Heater: The built-in variable-power heater allows the device to operate normally under extreme conditions (such as condensation environments). It can remove condensed water or spray water from the sensor surface, preventing creep phenomena in high-humidity environments and ensuring the accuracy of high-humidity measurements.
• Multiple Working Modes: Supports different measurement accuracy modes (high, medium, low) and provides three heating powers (high, medium, low) for the on-chip heater, which can be selected according to actual application requirements.

Application Fields:

• Smart Home: Monitors indoor temperature and humidity to enable automatic control of devices like air conditioners, humidifiers, and dehumidifiers, providing a comfortable living environment.
• Intelligent Buildings: Applied in offices, shopping malls, hotels, etc., to monitor environmental temperature and humidity, optimize the operation of HVAC systems, improve energy efficiency, and comply with health building standards such as RESET® and WELL Building Standard™.
• Meteorological Monitoring: Used in weather stations to measure atmospheric temperature and humidity, providing data support for weather forecasting and climate research.
• Industrial Automation: Monitors and controls the temperature and humidity of the production environment during industrial processes to ensure product quality and the normal operation of production equipment.
• Warehousing & Logistics: Used in warehouses, cold chain transportation, etc., to monitor the temperature and humidity of the storage environment and prevent goods from being 受潮 (moisture damage) or deteriorating.
• Agriculture & Aquaculture: Applicable to scenarios such as plant and animal cultivation, animal hatching, and plant seed germination boxes, providing suitable temperature and humidity conditions for the growth of plants and animals.

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