SHT21 is the new generation of Sensirion humidity and temperature sensors, which is embedded in a DFN package with reflow soldering, small size and low power consumption, and has excellent long-term stability. The sensor is calibrated and tested, and an electronic identification code is stored in the chip. The resolution of the sensor can be changed by entering commands, the sensor can detect low battery status, and output checksums to improve the reliability of communication.
This document describes the SHT21 humidity and temperature sensor, including its DFN package dimensions, digital output format, and built‑in CMOSens@ chip. It also outlines the sensor's low power consumption, RoHS/WEEE compliance, and available measurement packages (EK‑H4, EK‑H5).
Detailed electrical characteristics, pin definitions, timing diagrams, and recommended PCB layout guidelines are provided, along with packaging information, ESD protection standards, and warranty terms. This manual is written in Chinese.
| Temperature resolution | 14 bit (0.01 °C) |
|---|---|
| Supply voltage range | 2.1 V – 3.6 V (typical 3.0 V) |
| I²C clock frequency | up to 1 MHz |
| I²C SDA setup time | 100 ms |
The sensor operates from 2.1 V to 3.6 V, with a typical supply of 3.0 V.
The sensor provides a 14‑bit resolution, corresponding to 0.01 °C per step.