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SHT75 Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers |
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2 / 9 page SHT1x / SHT7x Relative Humidity & Temperature Sensor System www.sensirion.com v2.02 July 2004 2/9 1 Sensor Performance Specifications Parameter Conditions Min. Typ. Max. Units Humidity Resolution (2) 0.5 0.03 0.03 %RH 8 12 12 bit Repeatability ±0.1 %RH Accuracy (1) Uncertainty linearized see figure 1 Interchangeability Fully interchangeable raw data ±3 %RH Nonlinearity linearized <<1 %RH Range 0 100 %RH Response time 1/e (63%) slowly moving air 4 s Hysteresis ±1 %RH Long term stability typical < 0.5 %RH/yr Temperature 0.04 0.01 0.01 °C 0.07 0.02 0.02 °F Resolution (2) 12 14 14 bit ±0.1 °C Repeatability ±0.2 °F Accuracy see figure 1 -40 123.8 °C Range -40 254.9 °F Response Time 1/e (63%) 5 30 s Table 1 Sensor Performance Specifications 2 Interface Specifications SHT1x (slave) uC (master) DATA SCK Vdd 2.4 - 5.5V GND Vdd Figure 2 Typical application circuit 2.1 Power Pins The SHTxx requires a voltage supply between 2.4 and 5.5 V. After powerup the device needs 11ms to reach its “sleep” state. No commands should be sent before that time. Power supply pins (VDD, GND) may be decoupled with a 100 nF capacitor. 2.2 Serial Interface (Bidirectional 2-wire) The serial interface of the SHTxx is optimized for sensor readout and power consumption and is not compatible with I2C interfaces, see FAQ for details. 2.2.1 Serial clock input (SCK) The SCK is used to synchronize the communication between a microcontroller and the SHTxx. Since the interface consists of fully static logic there is no minimum SCK frequency. 2.2.2 Serial data (DATA) The DATA tristate pin is used to transfer data in and out of the device. DATA changes after the falling edge and is valid on the rising edge of the serial clock SCK. During transmission the DATA line must remain stable while SCK is high. To avoid signal contention the microcontroller should only drive DATA low. An external pull-up resistor (e.g. 10 kΩ ) is required to pull the signal high. (See Figure 2) Pull-up resistors are often included in I/O circuits of microcontrollers. See Table 5 for detailed IO characteristics. (1) Each SHTxx is tested to be fully within RH accuracy specifications at 25 °C (77 °F) and 48 °C (118.4 °F) (2) The default measurement resolution of 14bit (temperature) and 12bit (humidity) can be reduced to 12 and 8 bit through the status register. %RH Relative Humidity absolute accuracy ± 0 ± 1 ± 2 ± 3 ± 4 ± 5 0 30 40 20 10 80 50 100 70 90 60 Temperature accuracy 0 °C ±1 °C ±2 °C -40°C 0°C 40°C 80°C 120°C ±3 °C Dewpoint accuracy @ 25 °C (typical) ±0 °C ±1 °C ±2 °C ±3 °C ±4 °C ±5 °C 0 30 40 20 10 80 50 100 70 90 60 0 °F ±1.8 °F ±3.6 °F ±5.4 °F %RH ±1.8 °F ±3.6 °F ±7.2 °F ±5.4 °F ±9.0 °F -40°F 32°F 104°F 176°F 248°F %RH SHT75 SHT75 SHT11/71 SHT15 SHT11/71 SHT15 SHT11/71 SHT15/75 Figure 1 Rel. Humidity, Temperature and Dewpoint accuracies |
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