The Si7006/13/20/21/34 devices are Silicon Labs’ latest generation I2C relative humidity and temperature sensors. All members of this device family combine fully factory-calibrated humidity and temperature sensor elements with an analog to digital converter, signal processing and an I2C host interface. Patented use of industry-standard low-K polymer dielectrics provides excellent accuracy and long term stability, along with low drift and low hysteresis. The innovative CMOS design also offers the lowest power consumption in the industry for a relative humidity and temperature sensor. The Si7013/20/21/34 devices are designed for high-accuracy applications, while the Si7006 is targeted toward lower-accuracy applications that traditionally have used discrete RH/T sensors.
With full factory calibration, all Si70xx devices require no addition RH/temperature calibration during PCB assembly. The 2nd generation Si7006/13/20/21 devices feature a 3 mm x 3 mm package and wide 1.9 to 3.6 V power supply voltage, while the 3rd generation Si7034 device features a smaller 2 mm x 2 mm package and a low 1.67 V to 1.98 V power supply voltage popular in wearable and consumer devices. For protection against dust, dirt and chemical contaminants the Si7006/13/20/21 devices can be fitted with an optional factory-installed cover. In addition, designs that require 2-zone temperature sensing will benefit from the Si7013’s auxiliary sensor input with programmable linearization.