SHT21

SHT21

Manufacturer:: SENSIRION

SENSIRION SHT21 Digital Humidity & Temperature Sensor

Specifications

Product Introduction

The SHT21 humidity and temperature sensor is an industry standard in terms of form factor and intelligence. Embedded in a reflow solderable Dual Flat No leads (DFN) package of 3 x 3mm footprint and 1.1mm height, it provides calibrated, linearized sensor signals in digital, I2C format. The sensor contains a capacitive type humidity sensor, a band gap temperature sensor, and specialized analog and digital integrated circuits – all on a single CMOSens chip. This yields unmatched sensor performance in terms of accuracy and stability as well as minimal power consumption. Every sensor is individually calibrated and tested. A lot identification code is printed on the sensor and an electronic identification code is stored on the chip, which can be read out by command. The resolution can be changed by command (8/12bit up to 12/14bit for RH/T) and a checksum helps to improve communication reliability.

Features

  • Fully calibrated
  • Digital output, I2C interface
  • Low power consumption
  • Excellent long-term stability
  • DFN type package – reflow solderable
  • Individually calibrated and tested
  • Electronic identification code stored on chip
  • Changeable resolution by command
  • Checksum for communication reliability
  • RoHS and WEEE compliant

Applications

  • Humidity and temperature sensing in various environments
  • Data logging applications
  • Industrial and consumer electronics
  • HVAC systems
  • Weather stations
  • Automotive applications

Specifications Table

Supply Voltage, VDD 2.1 to 3.6 V
Supply Current, IDD (sleep mode) 0.15 to 0.4 µA
Supply Current, IDD (measuring) 200 to 330 µA
Power Dissipation (sleep mode) 0.5 to 1.2 µW
Power Dissipation (measuring) 0.6 to 1.0 mW
Heater 5.5mW, DT = +0.5-1.5°C
Communication Digital 2-wire interface, I2C protocol
Humidity Resolution (12 bit) 0.04 %RH
Humidity Resolution (8 bit) 0.7 %RH
Humidity Accuracy Tolerance (typ) ±2 %RH
Humidity Accuracy Tolerance (max) See Figure 2
Humidity Repeatability ±0.1 %RH
Humidity Hysteresis ±1 %RH
Humidity Nonlinearity <0.1 %RH
Humidity Response Time (τ 63%) 8 s
Humidity Operating Range 0 to 100 %RH
Humidity Long Term Drift <0.25 %RH/yr
Temperature Resolution (14 bit) 0.01 °C
Temperature Resolution (12 bit) 0.04 °C
Temperature Accuracy Tolerance (typ) ±0.3 °C
Temperature Repeatability ±0.1 °C
Temperature Operating Range -40 to 125 °C
Temperature Response Time (τ 63%) 5 to 30 s
Temperature Long Term Drift <0.02 °C/yr
Package Type DFN, 3 x 3 mm, 1.1 mm height

To learn more, please download the PDF.

Datasheet: