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SHT11 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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SHT11 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
4 / 9 page SHT1x / SHT7x Relative Humidity & Temperature Sensor System www.sensirion.com v2.02 July 2004 4/9 Command wait for data ready MSB LSB Checksum 0 0 0 0 Figure 6 Overview of Measurement Sequence (TS = Transmission Start) 2.3 Status Register Some of the advanced functions of the SHTxx are available through the status register. The following section gives a brief overview of these features. A more detailed description is available in the application note “Status Register” Command Status Reg 00 0 11 0 0 0 Figure 7 Status Register Write Command Status Reg Checksum 0011 0 0 0 1 Figure 8 Status Register Read Bit Type Description Default 7 reserved 0 6 R End of Battery (low voltage detection) ‘0’ for Vdd > 2.47 ‘1’ for Vdd < 2.47 X No default value, bit is only updated after a measurement 5 reserved 0 4 reserved 0 3 For Testing only, do not use 0 2 R/W Heater 0 off 1 R/W no reload from OTP 0 reload 0 R/W ’1’ = 8bit RH / 12bit Temperature resolution ’0’ = 12bit RH / 14bit Temperature resolution 0 12bit RH 14bit Temp. Table 3 Status Register Bits 2.3.1 Measurement resolution The default measurement resolution of 14bit (temperature) and 12bit (humidity) can be reduced to 12 and 8bit. This is especially useful in high speed or extreme low power applications. 2.3.2 End of Battery The “End of Battery” function detects VDD voltages below 2.47 V. Accuracy is ±0.05 V 2.3.3 Heater An on chip heating element can be switched on. It will increase the temperature of the sensor by 5-15 °C (9-27 °F). Power consumption will increase by ~8 mA @ 5 V. Applications: By comparing temperature and humidity values before and after switching on the heater, proper functionality of both sensors can be verified. • In high (>95 %RH) RH environments heating the sensor element will prevent condensation, improve response time and accuracy Warning: While heated the SHTxx will show higher temperatures and a lower relative humidity than with no heating. 2.4 Electrical Characteristics(1) VDD=5V, Temperature = 25 °C unless otherwise noted Parameter Conditions Min. Typ. Max. Units Power supply DC 2.4 5 5.5 V measuring 550 µA Supply current average 2(2) 28(3) µA sleep 0.3 1 µA Low level output voltage 0 20% Vdd High level output voltage 75% 100% Vdd Low level input voltage Negative going 0 20% Vdd High level input voltage Positive going 80% 100% Vdd Input current on pads 1 µA Output peak current on 4 mA Tristated (off) 10 µA Table 4 SHTxx DC Characteristics Parameter Conditions Min Typ. Max. Unit VDD > 4.5 V 10 MHz FSCK SCK frequency VDD < 4.5 V 1 MHz Output load 5 pF 3.5 10 20 ns TRFO DATA fall time Output load 100 pF 30 40 200 ns TCLx SCK hi/low time 100 ns TV DATA valid time 250 ns TSU DATA set up time 100 ns THO DATA hold time 0 10 ns TR/TF SCK rise/fall time 200 ns Table 5 SHTxx I/O Signals Characteristics SCK DATA TSU TF TR THO TCLH FSCK TV Figure 9 Timing Diagram 1) Parameters are periodically sampled and not 100% tested (2) With one measurement of 8 bit accuracy without OTP reload per second (3) With one measurement of 12bit accuracy per second |
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