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1-100707-01 Arkusz danych(PDF) 6 Page - Sensitron |
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1-100707-01 Arkusz danych(HTML) 6 Page - Sensitron |
6 / 12 page Datasheet SHT21 www.sensirion.com Version 1.0 – January 2010 6/12 of MCUs. See Table 4 and Table 5 for detailed I/O characteristic of the sensor. 4 Electrical Characteristics 4.1 Absolute Maximum Ratings The electrical characteristics of SHT2x are defined in Table 1. The absolute maximum ratings as given in Table 3 are stress ratings only and give additional information. Functional operation of the device at these conditions is not implied. Exposure to absolute maximum rating conditions for extended periods may affect the sensor reliability (e.g. hot carrier degradation, oxide breakdown). Parameter min max Units VDD to VSS -0.3 5 V Digital IO Pins (SDA, SCL) to VSS -0.3 VDD + 0.3 V Input Current on any Pin -100 100 mA Table 3 Electrical absolute maximum ratings ESD immunity is qualified according to MIL STD 883E, method 3015 (Human Body Model at 2 kV). Latch-up immunity is provided at a force current of 100mA with Tamb = 80°C according to JEDEC78A. For exposure beyond named limits the sensor needs additional protection circuit. 4.2 Input / Output Characteristics The electrical characteristics such as power consumption, low and high level input and output voltages depend on the supply voltage. For proper communication with the sensor it is essential to make sure that signal design is strictly within the limits given in Table 4 & 5 and Figure 10. Parameter Conditions min typ max Units Output Low Voltage, VOL VDD = 3.0 V, -4 mA < IOL < 0mA 0 - 0.4 V Output High Voltage, VOH 70% VDD - VDD V Output Sink Current, IOL - - -4 mA Input Low Voltage, VIL 0 - 30% VDD V Input High Voltage, VIH 70% VDD - VDD V Input Current VDD = 3.6 V, VIN = 0 V to 3.6 V - - ±1 uA Table 4 DC characteristics of digital input/output pads. VDD = 2.1 V to 3.6 V, T = -40 °C to 125 °C, unless otherwise noted. Figure 10 Timing Diagram for Digital Input/Output Pads, abbreviations are explained in Table 5. SDA directions are seen from the sensor. Bold SDA line is controlled by the sensor, plain SDA line is controlled by the micro-controller. Both valid times (SDA read and SDA write) refer to the left SCL toggle. Parameter min typ max Units SCL frequency, fSCL 0 - 0.4 MHz SCL High Time, tSCLH 0.6 - - µs SCL Low Time, tSCLL 1.3 - - µs SDA Set-Up Time, tSU 100 - - ns SDA Hold Time, tHD 0 - 900 ns SDA Valid Time, tVD 0 - 400 ns SCL/SDA Fall Time, tF 0 - 100 ns SCL/SDA Rise Time, tR 0 - 300 ns Capacitive Load on Bus Line, CB 0 - 400 pF Table 5 Timing specifications of digital input/output pads for I2C fast mode. Entities are displayed in Figure 10. VDD = 2.1V to 3.6V, T = -40°C to 125°C, unless otherwise noted. 5 Communication with Sensor SHT21 communicates with true I2C protocol. For information on I2C beyond the information in the following Sections please refer to the following website: http://www.standardics.nxp.com/support/i2c/. Please note that all sensors are set to the same I2C address, as defined in Section 5.3. 15 Furthermore, please note, that Sensirion provides a sample code on its home page – compare www.sensirion.com/sht21. 5.1 Start Up Sensor As a first step, the sensor is powered up to the chosen supply voltage VDD (between 2.1 V and 3.6 V). After power-up, the sensor needs at most 15 ms, while SCL is high, for reaching idle state, i.e. to be ready accepting 15 For sensors with alternative I2C address please contact Sensirion via info@sensirion.com. SCL 70% 30% tSCKL 1/fSCK tSCKH tR tF SDA 70% 30% tSU tHD SDA valid read DATA IN tR SDA 70% 30% DATA OUT tVD tF SDA valid write |
Podobny numer części - 1-100707-01 |
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Podobny opis - 1-100707-01 |
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