heat transfer can be ventilation, reduction of copper layers between the SHT1x and the rest of the PCB or milling a slit into the PCB around the sensor (see Figure 3.7). Figure 3.7: : Top view of example of mounted SHT1x with slits milled into PCB to minimize heat transfer. 3.2.7. Light The SHT1x is not light sensitive. Prolonged direct exposure to sunshine or strong UV radiation may age the housing. 3.2.8. Membranes SHT1x does not contain a membrane at the sensor opening. However, a membrane may be added to prevent dirt and droplets from entering the housing and to protect the sensor. It will also reduce peak concentrations of chemical vapors. For optimal response times the airvolume behind the membrane must be kept minimal. 3.2.9. Interface Specifications Table 3.1: SHT1x pin assignment, NC remain float The supply voltage of SHT1x must be in the range of 2.4 5.5V, recommended supply – voltage is 3.3V. Power supply pins Supply Voltage (VDD) and Ground (GND) must be decoupled with a 100 nF capacitor see Figure 29. The serial interface of the SHT1x is – optimized for sensor readout and effective power consumption. The sensor cannot be addressed by I2C protocol; however, the sensor can be connected to an I2C bus without interference with other devices connected to the bus. The controller must switch between the protocols. Figure 3.8: Typical application circuit, including pull up resistor RP and decoupling of VDD and GND by a capacitor.
heat transfer can be ventilation, reduction of copper layers between the SHT1x and the rest of the PCB or milling a slit into the PCB around the sensor (see Figure 3.7). Figure 3.7: : Top view of example of mounted SHT1x with slits milled into PCB to minimize heat transfer. 3.2.7. Light The SHT1x is not light sensitive. Prolonged direct exposure to sunshine or strong UV radiation may age the housing. 3.2.8. Membranes SHT1x does not contain a membrane at the sensor opening. However, a membrane may be added to prevent dirt and droplets from entering the housing and to protect the sensor. It will also reduce peak concentrations of chemical vapors. For optimal response times the airvolume behind the membrane must be kept minimal. 3.2.9. Interface Specifications Table 3.1: SHT1x pin assignment, NC remain float The supply voltage of SHT1x must be in the range of 2.4 – 5.5V, recommended supply voltage is 3.3V. Power supply pins Supply Voltage (VDD) and Ground (GND) must be decoupled with a 100 nF capacitor – see Figure 29. The serial interface of the SHT1x is optimized for sensor readout and effective power consumption. The sensor cannot be addressed by I2C protocol; however, the sensor can be connected to an I2C bus without interference with other devices connected to the bus. The controller must switch between the protocols. Figure 3.8: Typical application circuit, including pull up resistor RP and decoupling of VDD and GND by a capacitor.
GRADUATION%20REPORT(SERHAN%20HOROZ,MERVE%20AYIK,S%C3%9CLEYMAN%20CEM%20GEGA).docx