Digital Humidity and Temperature Sensor - SHT21

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%)

  • Model Number: SHT21
  • Data Sheet: Date Sheet File
Quantity:
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  • Digital Humidity and Temperature Sensor
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Product Specification

SHT21 Digital Humidity and Temperature Sensor Product Summary
The SHT21 humidity and temperature sensor of Sensirion has become 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 foot print and 1.1mm height it provides calibrated, linearized sensor signals in digital, I2C format.

The SHT2x sensors contain a capacitive type humidity sensor, a band gap temperature sensor and specialized analog and digital integrated circuit – all on a single CMOSens ? chip. This yields in an unmatched 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 by command. Furthermore, the resolution of SHT2x can be changed by command (8/12bit up to 12/14bit for RH/T) and a checksum helps to improve communication reliability.

With this set of features and the proven reliability and long-term stability, the SHT2x sensors offer an outstanding performance-to-price ratio. For testing SHT2x two evaluation kits EK-H4 and EK-H5 are available.

SHT21 Digital Humidity and Temperature Sensor FEATURES
? Fully calibrated
? Digital output, I2C interface
? Low power consumption
? Excellent long term stability
? DFN type package – reflow solderable

SHT21 Digital Humidity and Temperature Sensor Performance
Relative Humidity

Parameter
Condition
Value
Units
Resolution
12 bit
0.04
%RH
8 bit
0.7 %RH
Accuracy tolerance
typ
±2
%RH
max
see Figure 2
%RH
Repeatability

±0.1
%RH
Hysteresis

±1
%RH
Nonlinearity

<0.1
%RH
Response time
τ63%
8 s
Operating Range
extended
0 to 100
%RH
Long Term Drift
Typ.
< 0.25
%RH/yr


Temperature
Parameter
Condition
Value
Units
Resolution
14 bit
0.01 °C
12 bit
0.04 °C
Accuracy tolerance
typ
±0.3
°C
max
see Figure 3

Repeatability

±0.1
°C
Operating Range
extended
-40 to 125
°C
Response Time
τ63%
5 to 30
s
Long Term Drift
Typ.
< 0.02
°C/yr


Electrical Specification
Parameter
Conditions
min
typ
max
Units
Supply Voltage, VDD

2.1 3.0 3.6 V
Supply Current, IDD
sleep mode
- 0.15 0.4 μA
measuring
200 300 330 μA
Power Dissipation
sleep mode
- 0.5 1.2 μW
measuring
0.6 0.9 1.0 mW
average 8bit
- 3.2
- μW
Heater
VDD = 3.0 V
5.5mW, ΔT = + 0.5-1.5°C
Communication
digital 2-wire interface, I2C protocol


Other Series:

Series

Typ. Humidity

Accuracy %RH

Typ. Temperature

Accuracy °C

Supply Voltage Range V

Interface

Package Size

(L x W x H) mm

SHT30 ±2 ±0.2 2.4 to 5.5 I2C, analog voltage 2.5 x 2.5 x 0.9
SHT31 ±2 ±0.2 2.4 to 5.5 I2C, analog voltage 2.5 x 2.5 x 0.9
SHT35 ±1.5 ±0.1 2.4 to 5.5 I2C 2.5 x 2.5 x 0.9
SHTW1
±3
±0.4
1.62 to 1.98
I2C
1.3 x 0.7 x 0.5
SHTW2 ±3 ±0.4 1.62 to 1.98 I2C 1.3 x 0.7 x 0.5
SHTC1 ±3 ±0.3 1.62 to 1.98 I2C 2 x 2 x 0.8
SHT20 ±3 ±0.3 2.1 to 3.6 I2C, PWM, SDM 3 x 3 x 1.1
SHT21 ±2 ±0.3 2.1 to 3.6 I2C, PWM, SDM 3 x 3 x 1.1
SHT25 ±1.8 ±0.2 2.1 to 3.6 I2C 3 x 3 x 1.1
SHT10* ±4.5 ±0.5 2.4 to 5.5 Digital Sbus 7.5 x 4.9 x 2.6
SHT11*

±3

±0.4 2.4 to 5.5 Digital Sbus 7.5 x 4.9 x 2.6
SHT15* ±2 ±0.3 2.4 to 5.5 Digital Sbus 7.5 x 4.9 x 2.6
SHT71 ±3 ±0.4 2.4 to 5.5 Digital Sbus 19.5 x 5.08 x 3.1
SHT75 ±1.8 ±0.3 2.4 to 5.5 Digital Sbus 19.5 x 5.08 x 3.1
*Not recommended for new design (NRND); newer products available

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