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### 温湿度传感器SHT21知识点解析 #### 一、概述 SHT21是一款由Sensirion公司生产的温湿度传感器IC，该产品在形式因素和智能性方面成为了行业标准之一。它采用3mm×3mm尺寸的无引脚双平面（DFN）封装形式，高度为1.1mm，具有体积小、集成度高、易于安装等特点。SHT21能够提供线性的校准过的数字信号，并通过I2C接口进行数据传输。 #### 二、技术特性 ##### 1. 完全校准 SHT21传感器内置了温度和湿度测量功能，出厂前已经经过完全校准，用户无需进行额外的校准操作即可获得准确的测量结果。 ##### 2. 数字输出与I2C接口该传感器支持数字信号输出，采用I2C通信协议，这使得它可以方便地与微控制器等设备连接，实现温湿度数据的采集和处理。 ##### 3. 低功耗 SHT21的设计考虑到了节能需求，其工作时的功耗较低，适用于电池供电的应用场景，有助于延长设备的工作时间。 ##### 4. 长期稳定性优秀由于采用了先进的制造工艺和技术，SHT21在长时间使用过程中表现出良好的稳定性和可靠性，减少了维护成本。 ##### 5. DFN封装 SHT21采用DFN封装形式，支持回流焊接，便于自动化生产和大规模应用。 #### 三、内部结构与材料组成 ##### 1. 传感器芯片SHT21 该芯片集成了多种功能，包括相对湿度传感器、带隙温度传感器、放大器、A/D转换器、一次性可编程（OTP）存储器以及数字处理单元等，实现了高度集成化。 ##### 2. 材料成分 - **传感器本体**：采用硅材料。 - **封装材料**：铜引脚框架和绿色环氧树脂封装材料，符合RoHS和WEEE标准，不含铅、镉和汞等有害物质。 #### 四、外部封装与尺寸根据提供的图纸（图1），SHT21传感器的封装尺寸如下： - 总体尺寸：3mm×3mm×1.1mm - SCL与SDA之间的距离：1.0mm - NC与NC之间的距离：2.4mm - VSS与VDD之间的距离：0.3mm - NC与VSS之间的距离：0.4mm - NC与SCL之间的距离：1.5mm - NC与SDA之间的距离：0.4mm - NC与底面之间的距离：0.75mm - SCL与底面之间的距离：1.1mm - VSS与底面之间的距离：0.2mm #### 五、附加信息与评估套件 ##### 1. 附加信息更多关于SHT21的应用指南和其他相关信息，可以通过Sensirion官方网站www.sensirion.com/sht21获取，或者直接联系Sensirion公司info@sensirion.com获取技术支持。 ##### 2. 评估套件 - **EK-H4**：四通道设备，包含查看软件，支持数据记录功能。 - **EK-H5**：简单的单传感器评估套件，可通过USB端口直接连接到计算机上进行测试。 #### 六、应用场景 SHT21因其出色的性能和紧凑的设计，在多个领域有着广泛的应用前景： - **环境监测**：用于室内空气质量监控、温湿度控制等。 - **智能家居**：作为智能恒温器或空调系统的一部分，监测居住环境的变化。 - **工业自动化**：在生产线上监测环境条件，确保产品质量。 - **农业**：用于温室环境调节、土壤水分监测等。 - **医疗设备**：监测患者环境，确保医疗设备的正常运行。 SHT21是一款高性能的温湿度传感器，不仅具有出色的精度和稳定性，还具备体积小巧、易于集成的特点，非常适合于需要精确温湿度测量的各种场合。

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www.sensirion.com Version 5 – October 2022 1/14

Datasheet SHT21

Humidity and Temperature Sensor IC

▪ Fully calibrated

▪ Digital output, I

C interface

▪ Low power consumption

▪ Excellent long-term stability

▪ DFN type package – reflow solderable

Dimensions

Figure 1: Drawing of SHT21 sensor package, dimensions are

given in mm (1 mm = 0.039 inch), tolerances are ±0.1 mm. The

die pad (center pad) is internally connected to VSS. The NC

pads must be left floating. VSS = GND, SDA = DATA.

Numbering of E/O pads starts at lower right corner (indicated by

notch in die pad) and goes clockwise (compare Table 2).

Sensor Chip

SHT21 features a generation 4C CMOSens® chip.

Besides the capacitive relative humidity sensor and the

band gap temperature sensor, the chip contains an

amplifier, A/D converter, OTP memory and a digital

processing unit.

Material Contents

While the sensor itself is made of Silicon the sensors’

housing consists of a plated Cu lead-frame and green

epoxy-based mold compound. The device is fully RoHS

and WEEE compliant, e.g. free of Pb, Cd and Hg.

Additional Information and Evaluation Kits

Additional information such as Application Notes is

available from the web page www.sensirion.com/sht21.

For more information please contact Sensirion via

info@sensirion.com.

For SHT2x two Evaluation Kits are available: EK-H4, a

four-channel device with Viewer Software, that also serves

for data-logging, and a simple EK-H5 directly connecting

one sensor via USB port to a computer.

1.0

2.4

0.3

0.4

1.5

0.4

0.75

1.1

0.2

SCL

SDA

VSS

VDD

Bottom

View

SHT21

D0AC4

3.0

2.2

1.4 max

3.0

0.3 typ

2.4 max

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

1.1 mm height it provides calibrated, linearized sensor

signals in digital, I

C 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 (8/12 bit up to

12/14 bit 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.

www.sensirion.com Version 5 – October 2022 2/14

Sensor Performance

Relative Humidity

1234

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

 63%

Operating Range

extended

0 to 100

%RH

Long Term Drift

Typ.

< 0.25

%RH/yr

± 0

± 2

± 4

± 6

± 8

± 10

0 10 20 30 40 50 60 70 80 90 100

Relative Humidity (%RH)

DRH (%RH)

maximum accuracy

typical accuracy

Figure 2 Typical and maximal tolerance at 25°C for relative

humidity. For extensive information see Users Guide, Sect. 1.2.

Electrical Specification

Parameter

Condition

min

typ

max

Units

Supply Voltage, VDD

2.1

3.0

3.6

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

average 8bit

3.2

µW

Heater

VDD = 3.0 V

5.5mW, DT = + 0.5-1.5°C

Communication

digital 2-wire interface, I

C protocol

Table 1 Electrical specification. For absolute maximum values

see Section 4.1 of Users Guide.

Default measurement resolution is 14 bit (temperature) / 12 bit (humidity). It

can be reduced to 12/8 bit, 11/11 bit or 13/10 bit by command to user register.

Accuracies are tested at Outgoing Quality Control at 25°C and 3.0 V. Values

exclude hysteresis and long term drift and are applicable to non-condensing

environments only.

Time for achieving 63% of a step function, valid at 25°C and 1 m/s airflow.

Normal operating range: 0-80 %RH, beyond this limit sensor may read a

reversible offset with slow kinetics (+3 %RH after 60 h at humidity >80 %RH).

For more details please see Section 1.1 of the Users Guide.

Temperature

567

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

 63%

5 to 30

Long Term Drift

Typ.

< 0.02

°C/yr

± 0.0

± 0.5

± 1.0

± 1.5

± 2.0

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

DT (°C)

maximum accuracy

typical accuracy

Figure 3 Typical and maximal tolerance for temperature sensor

in °C.

Packaging Information

Sensor Type

Packaging

Quantity

Order Number

SHT21

Tape & Reel

400

1-100707-01

Tape & Reel

1500

1-100645-01

Tape & Reel

5000

1-100694-01

Please Note: This datasheet is subject to change and may

be amended without prior notice

Typical value for operation in normal RH/T operating range. Max. value is <

0.5 %RH/y. Value may be higher in environments with vaporized solvents, out-

gassing tapes, adhesives, packaging materials, etc. For more details please

refer to Handling Instructions.

Min and max values of Supply Current and Power Dissipation are based on

fixed VDD = 3.0 V and T<60°C. The average value is based on one 8bit

measurement per second.

Response time depends on heat conductivity of sensor substrate.

Max. value is < 0.04°C/y.

www.sensirion.com Version 5 – October 2022 3/14

Users Guide SHT21

1 Extended Specification

For details on how Sensirion is specifying and testing

accuracy performance please consult Application Note

“Statement on Sensor Specification”.

1.1 Operating Range

The sensor works stable within recommended Normal

Range – see Figure 4. Long term exposure to conditions

outside Normal Range, especially at humidity >80 %RH,

may temporarily offset the RH signal (+3 %RH after 60 h).

After return into the Normal Range it will slowly return

towards calibration state by itself. Prolonged exposure to

extreme conditions may accelerate ageing.

Figure 4 Operating Conditions

1.2 RH accuracy at various temperatures

Typical RH accuracy at 25°C is defined in Figure 2. For

other temperatures, typical accuracy has been evaluated

to be as displayed in Figure 5.

100 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3.5 ±4 ±4

90 ±3.5 ±3 ±2.5 ±2.5 ±2.5 ±2.5 ±3 ±3.5 ±4

80 ±3 ±2.5 ±2 ±2 ±2 ±2.5 ±2.5 ±3 ±3.5

70 ±3 ±2.5 ±2 ±2 ±2 ±2 ±2.5 ±2.5 ±3

60 ±2.5 ±2 ±2 ±2 ±2 ±2 ±2 ±2.5 ±2.5

50 ±2.5 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2.5

40 ±2.5 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2

30 ±2.5 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2

20 ±2.5 ±2.5 ±2 ±2 ±2 ±2 ±2 ±2 ±2

10 ±3 ±3 ±2.5 ±2.5 ±2.5 ±2.5 ±2.5 ±2.5 ±2.5

0 ±3.5 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3 ±3

0 10 20 30 40 50 60 70 80

Relative Humidity [%RH]

Temperature [°C]

Figure 5 Typical accuracy of relative humidity measurements

given in %RH for temperatures 0 – 80°C.

1.3 Electrical Specification

Current consumption as given in Table 1 is dependent on

temperature and supply voltage VDD. For estimations on

energy consumption of the sensor Figures 6 and 7 may be

consulted. Please note that values given in these Figures

are of typical nature and the variance is considerable.

0 20 40 60 80 100 120

Temperature (°C)

Supply Current IDD (μA)

Figure 6 Typical dependency of supply current (sleep mode)

versus temperature at VDD = 3.0 V. Please note that the

variance of these data can be above ±25% of displayed value.

2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5

Supply Voltage (VDD)

Supply Current IDD (nA)

Figure 7 Typical dependency of supply current (sleep mode)

versus supply voltage at 25°C. Please note that deviations may

be up to ±50% of displayed value. Values at 60°C scale with a

factor of about 15 (compare Table 1).

100

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

Relative Humidity (%)

Max.

Range

Normal

Range

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