Si7021 Industrial High Precision Humidity Sensor I2C Interface
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020

Si7021 Industrial High Precision Humidity Sensor I2C Interface

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  • Product SKU: KG557
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The main chip is GY-213V-HDC1080(Can use SHT21 HTU21D SI7021 chip to make the same sensor)

This I2C digital humidity sensor is a fairly accurate and intelligent alternative to the much simpler Humidity and Temperature Sensor – SHT15 Breakout It has a typical accuracy of ±4% with an operating range that’s optimized from 10% to 80% RH. Operation outside this range is still possible – just the accuracy might drop a bit. The temperature output has a typical accuracy of ±0.2°C from -20~85°C.

The HDC1080 sensor chip has 2 address-select pins, so you can have up to 4 shared on a single I2C bus. It’s also 3-5V power and logic safe so you don’t need any level shifters or regulators to use with a 5V or 3V microcontroller.

Please note: TI has indicated that there’s a ‘settling’ effect for the humidity and that you will need to re-hydrate the sensor once you receive it. To rehydrate it, place it in a location with 85% humidity for 24 hours or 60% humidity for 10 days.

The HDC1080 is a digital humidity sensor with an integrated temperature sensor that provides excellent measurement accuracy at very low power. The HDC1080 operates over a wide supply range and is a low-cost, low-power alternative to competitive solutions in a wide range of common applications. The humidity and temperature sensors are factory calibrated.

Technical Details

  • Precision Relative Humidity Sensor : ± 3% RH (max), 0–80% RH
  • High Accuracy Temperature Sensor : ±0.4 °C (max), –10 to 85 °C
  • 0 to 100% RH operating range
  • Up to –40 to +125 °C operating range
  • Wide operating voltage (1.9 to 3.6 V)
  • Low Power Consumption 150 μA active current
  • Factory-calibrated
  • I2C Interface
  • Integrated on-chip heater
  • 3x3 mm DFN Package
  • Excellent long term stability
  • Optional factory-installed cover
  • Low-profile
  • Protection during reflow
  • Excludes liquids and particulates


  • Relative Humidity Accuracy ±2% (typical)
  • Temperature Accuracy ±0.2°C (typical)
  • Excellent Stability at High Humidity
  • 14 Bit Measurement Resolution
  • 100 nA Sleep Mode Current

Power Pins

  • Vin – this is the power pin. Unlike many sensors, this chip can be powered by 3-5 VDC, so there is no voltage regulator on board. Simply power the board with the same power as the logic level of your microcontroller – e.g. for a 5V micro like Arduino, use 5V. For a 3V ARM processor, use 3V
  • GND – common ground for power and logic
  • I2C Logic pins:
  • SCL – I2C clock pin, connect to your microcontrollers I2C clock line. 3-5V logic OK
  • SDA – I2C data pin, connect to your microcontrollers I2C data line. 3-5V logic OK

Optional Pins

  • These are pins you don’t need to connect to unless you want to!
  • RDY – This is the interrupt/’ready’ pin from the HDC100x. The chip has some capability to ‘alert’ you when data is ready to be read from the sensor. We don’t use this pin in our library but it’s available if you need it! It is an open collector so you need to use a pull-up resistor if you want to read the signal from this pin.
  • A0 A1 – These are the address select pins. Since you can only have one device with a given address on an i2c bus, there must be a way to adjust the address if you want to put more than one HDC100X on a shared i2c bus. The A0/A1 pins set the bottom 2 bits of the i2c address. There are pull-down resistors on the board so connect them to Vin to set the bits to ‘1’. They are read on power-up, so de-power and re-power to reset the address.

Physical Attributes

  • L x W x H (mm): 13 x 13 x 2
  • Weight (gm) : 1

Integration with Arduino

Sample Code

Integration with Raspberry Pi

Sample Code

Product Video


Package Includes

  • 1 x Si7021 Industrial High Precision Humidity Sensor I2C Interface

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