This document introduces the technical manual of the SHT21 temperature and humidity sensor, including its fully calibrated, digital output, low power consumption, and excellent long-term stability. The sensor is packaged in DFN, suitable for reflow soldering, and has outstanding performance and stability.
This manual describes the SHT21 humidity and temperature sensor, its digital I2C interface, low‑power operation, and the new DFN package suitable for reflow soldering. It includes product overview, performance data, electrical characteristics, and recommended PCB design.
Key sections cover wiring and soldering guidelines, storage and handling recommendations, I2C communication protocol, measurement resolution, soft‑reset command, safety warnings, and warranty information. This manual is written in Chinese.
| Supply voltage (VDD) | 2.1‑3.6 V (recommended 3.0 V) |
|---|---|
| Default measurement resolution | 14 bit temperature, 12 bit humidity |
| Heater power consumption | ≈5.5 mW |
| I2C clock frequency (SCL) | 0 – 0.4 MHz |
The sensor operates from 2.1 V to 3.6 V, with a recommended supply of 3.0 V.