Electronic Components Datasheet Search |
|
SHT25 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
|
SHT25 Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
6 / 14 page Datasheet SHT25 www.sensirion.com Version 3 – May 2014 6/14 3 Interface Specifications Pin Name Comment 1 SDA Serial Data, bidirectional 2 VSS Ground 5 VDD Supply Voltage 6 SCL Serial Clock, bidirectional 3,4 NC Not Connected Table 2 SHT2x pin assignment, NC must remain floating (top view) 3.1 Power Pins (VDD, VSS) The supply voltage of SHT2x must be in the range of 2.1 – 3.6V, recommended supply voltage is 3.0V. Power supply pins Supply Voltage (VDD) and Ground (VSS) must be decoupled with a 100nF capacitor, that shall be placed as close to the sensor as possible – see Figure 11. 3.2 Serial clock (SCL) SCL is used to synchronize the communication between microcontroller (MCU) and the sensor. Since the interface consists of fully static logic there is no minimum SCL frequency. 3.3 Serial SDA (SDA) The SDA pin is used to transfer data in and out of the sensor. For sending a command to the sensor, SDA is valid on the rising edge of SCL and must remain stable while SCL is high. After the falling edge of SCL the SDA value may be changed. For safe communication SDA shall be valid tSU and tHD before the rising and after the falling edge of SCL, respectively – see Figure 12. For reading data from the sensor, SDA is valid tVD after SCL has gone low and remains valid until the next falling edge of SCL. Figure 11 Typical application circuit, including pull-up resistors RP and decoupling of VDD and VSS by a capacitor. To avoid signal contention the micro-controller unit (MCU) must only drive SDA and SCL low. External pull-up resistors (e.g. 10kΩ), are required to pull the signal high. For the choice of resistor size please take bus capacity requirements into account (compare Table 5). It should be noted that pull-up resistors may be included in I/O circuits 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 I/O 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 JEDEC JESD22- A114 method (Human Body Model at 4kV), JEDEC JESD22-A115 method (Machine Model 200V) and ESDA ESD-STM5.3.1-1999 and AEC-Q100-011 (Charged Device Model, 750V corner pins, 500V other pins). Latch- up immunity is provided at a force current of 100mA with Tamb = 125°C according to JEDEC JESD78. 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 12. Parameter Conditions min typ max Units Output Low Voltage, VOL VDD = 3.0 V, -4 mA < IOL < 0mA 0 - 0.4 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 = 2.1V to 3.6V, T = -40°C to 125°C, unless otherwise noted. SDA SCL GND VDD MCU (master) RP RP SCL OUT SDA OUT SDA IN SCL IN SHT2x (slave) 1 6 5 2 4 3 |
Similar Part No. - SHT25_15 |
|
Similar Description - SHT25_15 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |