SHT20数字温湿度传感器：I2C接口、低功耗与全面规格
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更新于2024-07-17
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"SHT20是一款由Sensirion公司生产的温湿度传感器集成电路，该数据手册（SHT20_datasheet.pdf）提供了详细的技术规格和特性。SHT20的主要特点包括：
1. 完全校准：传感器出厂时已经过全面校准，确保测量结果的准确性。
2. 数字输出与I2C接口：SHT20采用I2C通信协议，这是一种低功耗、易于集成的接口，可以方便地与其他微控制器或电子设备进行数据交换。
3. 低功耗设计：在维持精确测量的同时，SHT20具有出色的节能性能，适合于电池供电或能源受限的应用场景。
4. 长期稳定性：长时间使用下，传感器表现出优秀的长期稳定性和一致性，减少了环境变化对测量结果的影响。
5. 封装形式：SHT20采用DFN（倒装芯片）封装，这种小型化的封装设计易于回流焊接，尺寸为1mm x 1mm，具有±0.1mm的制造公差。
6. 引脚布局：传感器上的引脚包括VSS（接地）、SDA（数据线），以及一组E/O（输入/输出）引脚，引脚编号从右下角的缺口处按顺时针方向开始（参见表2）。
7. 核心组件：SHT20内含一个第四代CCMOSens®芯片，集成了电容式湿度传感器、带隙温度传感器、放大器、A/D转换器、非易失性存储器以及数字处理单元。
8. 材料与合规性：尽管传感器主体由硅制成，但其外壳采用了无铅（Pb）、镉（Cd）和汞（Hg）等有害物质的绿色封装技术，符合RoHS（ Restriction of Hazardous Substances）和WEEE（ Waste Electrical and Electronic Equipment）标准。
9. 附加资源：除了数据手册，Sensirion还提供应用笔记等额外信息，以帮助用户理解和优化SHT20在具体应用中的性能。
SHT20是一款高性能、低功耗且环保的温湿度传感器，适用于多种工业和消费电子应用，如智能家居、医疗设备、工业自动化等领域。通过理解并参考这份数据手册，开发人员可以充分利用SHT20的特性来构建精确且可靠的湿度和温度监测系统。"
Datasheet SHT20
www.sensirion.com Version 4 – May 2014 3/14
Users Guide SHT20
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 60h).
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.
.
Figure 5 Typical accuracy of relative humidity measurements
given in %RH for temperatures 0 – 80°C.
Please note that above values are maximal tolerances (not
including hysteresis) against a high precision reference
such as a dew point mirror. Typical deviations are at
±2%RH where maximal tolerance is ±3%RH and about
half the maximal tolerance at other values.
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.
Figure 6 Typical dependency of supply current (sleep mode)
versus temperature at VDD = 3.0V. Please note that the
variance of these data can be above ±25% of displayed value.
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 ±4.5 ±4 ±4 ±4 ±4 ±4 ±4.5 ±5 ±5
90 ±4.5 ±4 ±3.5 ±3.5 ±3.5 ±3.5 ±4 ±4.5 ±5
80 ±4 ±3.5 ±3 ±3 ±3 ±3.5 ±3.5 ±4 ±4.5
70 ±4 ±3.5 ±3 ±3 ±3 ±3 ±3.5 ±3.5 ±4
60 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3 ±3.5 ±3.5
50 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3.5
40 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3
30 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3
20 ±3.5 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3 ±3
10 ±4 ±4 ±3.5 ±3.5 ±3.5 ±3.5 ±3.5 ±3.5 ±3.5
0 ±4.5 ±4.5 ±4 ±4 ±4 ±4 ±4 ±4 ±4
0 10 20 30 40 50 60 70 80
Relative Humidity [%RH]
Temperature [°C]
0
1
2
3
4
5
6
7
8
0 20 40 60 80 100 120
Supply Current IDD (μA)
Temperature (°C)
6
8
10
12
14
16
18
20
2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5
Supply Current IDD (nA)
Supply Voltage (VDD)
0
10
20
30
40
50
60
70
80
90
100
-40 -20 0 20 40 60 80 100 120
Relative Humidity (%)
Temperature (°C)
Max.
Range
Normal
Range
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