SHT21S datasheet by Sensirion

SHT21S Frequently Asked Questions (FAQs)

• What is the recommended reflow soldering profile for the SHT21S?
  Sensirion recommends a reflow soldering profile with a peak temperature of 260°C, a dwell time above 220°C of 30-60 seconds, and a cooling rate of 4°C/s or less.
• How do I handle the SHT21S's exposed pad during PCB design?
  The exposed pad should be connected to GND to ensure proper thermal and electrical performance. A thermal via or a large copper area connected to GND can be used to dissipate heat.
• What is the recommended humidity range for calibration and use of the SHT21S?
  The SHT21S should be calibrated and used within a humidity range of 20% to 80% RH to ensure optimal accuracy and performance.
• How do I prevent condensation on the SHT21S sensor?
  To prevent condensation, ensure that the sensor is stored and operated in an environment with a relative humidity below 80%. If condensation occurs, allow the sensor to dry slowly at room temperature.
• What is the recommended power-up sequence for the SHT21S?
  Power up the VCC pin first, followed by the SCL and SDA pins. This ensures proper initialization of the sensor and prevents potential damage.