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Si7021

I²C Humidity and Temperature Sensor

Silicon Labs

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.

Datasheets:
Product Description

The Si7021 is available in a 3x3 mm DFN package and is reflow solderable. It can be used as a hardware- and software-compatible drop-in upgrade for existing RH/ temperature sensors in 3x3 mm DFN-6 packages, featuring precision sensing over a wider range and lower power consumption. The optional factory-installed cover offers a low profile, convenient means of protecting the sensor during assembly (e.g., reflow soldering) and throughout the life of the product, excluding liquids (hydrophobic/oleophobic) and particulates. 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.

Features
  • Precision Relative Humidity Sensor ±3% RH (maximum), 0–80% RH
  • High Accuracy Temperature Sensor ±0.4°C (maximum), –10°C to 85°C
  • 0 to 100% RH operating range
  • Up to -40°C to +125°C operating range
  • Low Voltage Operation (1.9V to 3.6V)
  • Low Power Consumption
    • 150µA active current
    • 60nA standby 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
Applications:
  • HVAC/R
  • Thermostats/humidistats
  • Respiratory therapy
  • White goods
  • Indoor weather stations
  • Micro-environments/data centers
  • Automotive climate control and defogging
  • Asset and goods tracking
  • Mobile phones and tablets
Specifications
  • Accuracy:±3% RH
  • Humidity Range:0 ~ 100% RH
  • Mounting Type:Surface Mount
  • Output:12 b ~ 12b
  • Output Type:I²C
  • Package / Case:6-WDFN Exposed Pad
  • Response Time:18s
  • Sensor Type:Humidity, Temperature
  • Supplier Device Package:6-DFN (3x3)
  • Voltage - Supply:1.9V ~ 3.6V
Parts

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SI7021-A20-GM1RSI7021-A20-GM1RSENS HUMID/TEMP 3.6V I2C 2% 6DFNHumidity, Temperature0 ~ 100% RHI²C12b6-WDFN Exposed PadRoHS
SI7021-A20-GMSI7021-A20-GMSENS HUMI/TEMP 3.6V I2C 3% 6DFN Humidity, Temperature0 ~ 100% RHI²C12b6-WDFN Exposed PadRoHS
SI7021-A20-IMSI7021-A20-IMSENS HUMI/TEMP 3.6V I2C 3% 6DFN Humidity, Temperature0 ~ 100% RHI²C12b6-WDFN Exposed PadRoHS
SI7021-A20-GM1SI7021-A20-GM1SENS HUMI/TEMP 3.6V I2C 3% 6DFN Humidity, Temperature0 ~ 100% RHI²C12b6-WDFN Exposed PadRoHS
SI7021-A20-IM1SI7021-A20-IM1SENS HUMI/TEMP 3.6V I2C 3% 6DFN Humidity, Temperature0 ~ 100% RHI²C12b6-WDFN Exposed PadRoHS
SI7021-A20-GMRSI7021-A20-GMRSENS HUMID/TEMP 3.6V I2C 3% 6DFNHumidity, Temperature0 ~ 100% RHI²C12b6-WDFN Exposed PadRoHS
SI7021-A20-IMRSI7021-A20-IMRSENS HUMID/TEMP 3.6V I2C 3% 6DFNHumidity, Temperature0 ~ 100% RHI²C12b6-WDFN Exposed PadRoHS
SI7021-A20-IM1RSI7021-A20-IM1RSENS HUMID/TEMP 3.6V I2C 3% 6DFNHumidity, Temperature0 ~ 100% RHI²C12b6-WDFN Exposed PadRoHS
SI7021-A20-YM1RSI7021-A20-YM1RSENSOR RHT DGTL AUTO 6DFN Humidity, Temperature0 ~ 100% RHI²C12 b6-WDFN Exposed PadRoHS
SI7021-A20-YM0SI7021-A20-YM0SENSOR RHT DGTL AUTO 6DFN Humidity, Temperature0 ~ 100% RHI²C12 b6-WDFN Exposed PadRoHS
SI7021-A20-YM1SI7021-A20-YM1SENSOR RHT DGTL AUTO 6DFN Humidity, Temperature0 ~ 100% RHI²C12 b6-WDFN Exposed PadRoHS

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Category: RF, Wireless-RF, IF-Evaluation, Development Kits, Boards