Digital Humidity Sensor SHT2x (RH/T)

Used For A Variety Of Applications And Has Become The Industry Standard

The digital SHT2x humidity sensor series is used in high volumes in a wide variety of applications and has today become the de facto industry standard. The SHT2x series consists of a low-cost version with the SHT20 humidity sensor, a standard version with the SHT21 humidity sensor, and a high-end version with the SHT25 humidity sensor. The open cavity mold package - which encapsulates the complete chip except for the humidity sensor area - protects the capacitive humidity sensor against external impact and facilitates excellent long-term stability. The SHT2x sensors are available both in large and small volumes.

Embedded in a reflow solderable dual-flat no-leads (DFN) package of 3 × 3 × 1.1 mm³, the SHT2x provides calibrated, linearized sensor signals in digital, I²C format. The SHT2x humidity sensor series 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 superior sensor performance in terms of accuracy and stability as well as minimal power consumption.

Every sensor is individually calibrated and tested. Lot identification is printed on the sensor and an electronic identification code is stored on the chip – which can be read out on command. Furthermore, the resolution of the SHT2x humidity sensor can be changed on command (8/12 bit up to 12/14 bit for RH/T) and a checksum helps to improve communication reliability. With this set of features and its proven reliability and long-term stability, the SHT2x humidity sensor series offers an outstanding price-performance ratio. To test a humidity sensor from the SHT2x series, two evaluation kits, EK-H4 and EK-H5, are available.

Overview of SHT2x Versions

Series	Version	Typ. Humidity Accuracy %RH	Typ. Temperature °C	Supply Voltage Range V	Interface	Package Size (L x W x H) mm
SHT20	Low-Cost	±3	±0.3	2.1 to 3.6	I²C digital, PWM, SDM	3 x 3 x 1.1
SHT21	Standard	±2	±0.3	2.1 to 3.6	I²C digital, PWM, SDM	3 x 3 x 1.1
SHT25	High-End	±1.8	±0.2	2.1 to 3.6	I²C digital, PWM, SDM	3 x 3 x 1.1

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Features

Size	3 x 3 x 1.1 mm
Output	I²C digital, PWM, SDM
Supply voltage range	2.1 to 3.6 V
Energy consumption	3.2µW (at 8 bit, 1 measurement / s)
RH operating range	0 - 100% RH
T operating range	-40 to +125°C (-40 to +257°F)
RH response time	8 sec (tau63%)