Key facts
- Brand
- SENSIRION
- Model
- SHT21
- Industry
- Industrial
- Documents
- 6
- Languages
- ZH · EN
- Last added
- 2023-03-20
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Sensirion SHT21 Humidity and Temperature Sensor Datasheet
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.
SENSIRION SHT21 specifications
| 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) |
Source: Sensirion SHT21 Humidity and Temperature Sensor Datasheet
All SENSIRION SHT21 documents by type
Disassembly, diagnostics and part numbers, for repair.
Ratings, dimensions and ordering codes, for selection and design work.
Instruction set, parameters and examples for configuring or programming the device.
Questions answered in these manuals
What are the recommended soldering conditions for the SHT21?
For reflow soldering, the peak temperature should not exceed 260°C with a contact time of less than 40 seconds.
From: Sensirion SHT21 Humidity and Temperature Sensor Datasheet
What is the recommended storage condition after soldering?
The sensor should be stored in an environment with >75% RH for at least 12 hours to ensure polymer rehydration.
From: Sensirion SHT21 Humidity and Temperature Sensor Datasheet
How do I perform a soft reset of the SHT21 sensor?
Call the function SHT2x_SoftReset(), which sends the soft‑reset command over I²C and waits for the sensor to restart.
How can I read the 64‑bit serial number of the sensor?
Use the SHT2x_GetSerialNumber() routine; it reads the serial number from the sensor’s on‑chip memory and returns it in an 8‑byte array.
What measurement resolution does the SHT21 provide?
It offers 12‑bit resolution for humidity (0.04 %RH) and 14‑bit resolution for temperature (0.01 °C).
How large is the SHT21 package?
The sensor is packaged in a 3 × 3 mm DFN footprint with a height of 1.1 mm.