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.
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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.
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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.
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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.
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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.
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| 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. |
| 60 nA 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. |
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| HVAC/R. |
| Thermostats/humidistats. |
| Respiratory therapy. |
| Indoor weather stations. |
| Micro-environments/data centers. |
| Automotive climate control and defogging. |
| Asset and goods tracking. |
| Mobile phones and tablts. |
| Size: 1.3*1cm/0.51*0.39". |
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