SHT21 - Sensirion

SHT21 Frequently Asked Questions (FAQs)

• What is the recommended reflow soldering profile for SHT21?
  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 slower.
• How do I handle the SHT21's humidity sensor to avoid contamination?
  Handle the SHT21 by the edges, avoid touching the sensor opening, and store the device in a clean, dry environment to prevent contamination. Clean the sensor with compressed air or a soft brush if necessary.
• What is the recommended layout and spacing for the SHT21's pins?
  Keep the pins as short as possible, and maintain a minimum spacing of 0.5 mm between the pins and other components to ensure reliable operation and prevent electrical interference.
• How do I calibrate the SHT21's temperature and humidity sensors?
  The SHT21 is calibrated during manufacturing, but you can perform a one-point calibration for temperature and humidity using a reference sensor and the device's built-in calibration registers.
• What is the SHT21's response time for temperature and humidity measurements?
  The SHT21's response time is typically 4-6 seconds for temperature and 8-10 seconds for humidity, depending on the sampling rate and environmental conditions.