The SHT21 is a high-performance digital temperature and humidity sensor with I2C interface and DFN package suitable for reflow soldering. The sensor is fully calibrated and has excellent long-term stability.
The document describes the Sensirion SHT21, a next-generation digital humidity and temperature sensor featuring I2C interface output, low power consumption, and long-term stability. It utilizes a CMOSens® chip with capacitive relative humidity sensing and gap-based temperature sensing elements, packaged in a 3x3mm DFN format suitable for reflow soldering.
The datasheet details the device's performance parameters, including resolution (up to 14-bit), accuracy, response time, and operating ranges. It also provides specific application information regarding PCB design requirements for the DFN package, soldering guidelines compliant with IPC/JEDEC standards, storage conditions, and recovery procedures after exposure to non-normal environmental conditions. This manual is written in Chinese.
| Operating Range (Humidity) | 0 - 100 %RH |
|---|---|
| Supply Voltage | 2.1 to 3.6 V |
| Operating Temperature Range | -40 to 125 °C |
| Package Type | DFN (3 x 3 mm) |
For reflow soldering, the peak temperature should not exceed 260°C with a contact time of less than 40 seconds.
The sensor should be stored in an environment with >75% RH for at least 12 hours to ensure polymer rehydration.