Product Overview
The SI7050-A20-IM from Silicon Labs is a digital relative humidity and temperature sensor with ±2% RH accuracy and ±0.3°C temperature accuracy. It provides 14-bit resolution via I2C interface in a compact 3x3mm DFN-6 package.
Key Specifications
| Function | Digital relative humidity & temperature sensor |
| Humidity Accuracy | ±2% RH (0-80% RH) |
| Temperature Accuracy | ±0.3°C |
| Resolution | 14-bit humidity, 14-bit temperature |
| Interface | I2C |
| Supply Voltage | 1.9V to 3.6V |
| Package | DFN-6 (3x3mm) |
Working Principle
A capacitive sensing element measures relative humidity by detecting changes in the dielectric constant of a polymer film as it absorbs/desorbs moisture. An on-chip bandgap temperature sensor provides compensated temperature readings. An internal ADC digitizes both measurements to 14-bit resolution with factory-calibrated correction coefficients.
Applications
- HVAC / thermostats
- Weather stations
- Warehouse / cold chain monitoring
- Consumer appliance