GY-21 HTU21 TEMPERATURE AND HUMIDITY SENSOR

The Si7021 I2C Humidity and Temperature Sensor is a monolithic CMOS IC integrating humidity and temperature sensor elements, an analog-to-digital converter, signal processing, calibration data, and an I2C Interface.

The patented use of industry-standard, low-K polymeric dielectrics for sensing humidity enables the construction of low-power, monolithic CMOS Sensor ICs with low drift and hysteresis, and excellent long term stability. The humidity and temperature sensors are factory-calibrated and the calibration data is stored in the on-chip non-volatile memory.

This ensures that the sensors are fully interchangeable, with no recalibration or software changes required. The Si7021 is available in a 3×3 mm DFN package and is reflow solderable. It can be used as a hardware- and software-compatible drop-in upgrade for existing Featuring precision sensing over a wider range and lower power consumption.

The Si7021 offers an accurate, low-power, factory-calibrated digital solution ideal for measuring humidity, dew-point, and temperature, in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms.

This breakout board has built-in 4.7k pull-up resistors for I2C communication. If you’re connecting multiply I2C devices on the same bus, you may want to turn off these resistors.

Features:

• • Power supply : 3-5V
  • Relative humidity: ± 3% RH (max), 0-80% RH
  • Temperature: ±0.4°C (max), -10 to 85°C
  • Operating range: 0 to 100% RH
  • Operating range: Up to -40°C to +125 °C
  • Wide operating voltage: 1.9V – 3.6V
  • Low power consumption: 150 ?A active current
  • Standby current: 60 nA

Package Includes:

• • GY-21 HTU21 Humidity & Temperature Sensor Module
  • 1 x 4 Pin Male Header