Datasheet Evaluation Kit EK-H5 For Humidity and Temperature Sensors Simple and easy-to-use evaluation kit Viewer software available for download USB Interface Product Summary The evaluation kit is made for running Sensirions humidity The viewer software can be downloaded from the and temperature sensors. It is held very compact: a USB Sensirion web page and allows logging data and changing 2 dongle with USB to I C translator capabilities allows resolution for SHT2x, SHTC1, SHT7x/SHT1x and for connecting the sensor directly to the USB port. With the STSC1, STS21. For the SHT3x sensor series it is possible accompanying viewer software it is possible to to use the alert function, the internal heater as well as the communicate with the sensors, display measured values ART function. The main purpose of the evaluation kit is to and export data into a csv file. The evaluation kit is demonstrate the unique performance of Sensirions available in two versions. The standard version is available humidity and temperature sensor without the requirement for sensors that can operate at 3.3 V, while the 1.8V of any hardware or software design work. version is for the sensors operated at 1.8 V. Set-Up of EK-H5 (Order No. 1-100738-02) Set-Up of EK-H5 1.8V (Order No. 1-101021-02) Figure 1 Schematic of Evaluation Kit EK-H5. Figure 2 Schematic of Evaluation Kit EK-H5 1.8V. Material Contents Material Contents 2 2 1 EK-H5 USB Stick: Contains USB to I C translator 1 EK-H5 USB Stick: Contains USB to I C translator capabilities. capabilities. 1 Sensor cable of 1m length with a plug for 1 Sensor cable of 1m length with a plug for connecting with USB dongle and a ZIF connector for connecting the USB dongle with a combo connector connecting with a sensor on FPCB. Please note that a for connecting a sensor on PCB or FPCB. level shifter board is integrated into the cable. This 1 SHT31-DIS sensor: mounted on PCB. level shifter converts the 3.3V on the USB dongle side to 1.8V on the sensor side. 1 SHT31-DIS sensor: mounted on FPCB. 1 SHTC1 sensor: mounted on FPCB. 1 SHT21 sensor: mounted on PCB. 1 SHTW1 sensor: mounted on FPCB. 1 STSC1 sensor: mounted on FPCB. Please note that 1.8V sensors must be operated with the cable supplied in the EK-H5 1.8V which contains the level shifter that converts the voltage level of 3.3 V on the USB dongle side to 1.8V on the sensor side. Using the wrong supply can damage the sensor. www.sensirion.com July 2015 - Version 4 1/5 Datasheet Evaluation Kit EK-H5 Please note that the USB stick, sensor cable and sensor EK-H5 Pin Assignment must be connected to the computer before starting the software. No further software driver or any other hardware is required for running EK-H5. When starting the viewer software, the type of sensor must be selected in a first window (several sensors are given for choice). The settings (explained below) must be chosen and then the measurement may be started. 1 2 3 4 Features 1 2 3 4 2 1 3 4 Sampling Time s : Defines the number of measurements per second. For the SHT2x, SHT1x/SHT7x and SHTC1 Sensor Pin Name Description sensor series the measurement intervals are free of choice 1 SCL Serial clock in the range from 1 1440s. 2 VDD Supply voltage The SHT3x is operated in periodic-mode: the value in this 3 VSS Ground field is rounded to the nearest periodic acquisition 4 SDA Serial data frequency as shown in the datasheet. After clicking the RUN button a single initial command is send to the sensor. Table 1 Pin Assignments: SHTxx on PCB, SHT71 and After this the viewer software only reads out the measured SHTxx on FPCB sensors. values from the sensor. When the STOP button is clicked, the sensor stops to measure and is switched to idle mode. Viewer Software Resolution: Allows changing the resolution for SHT2x and SHT1x/SHT7x for RH & T. The sensor SHTC1 and SHT3x The appearance of the viewer software is slightly different always measure with the highest repeatability (longest for the different sensor types. The main difference is that measurement time). the viewer software for the SHT3x includes additional features (Alert mode, Heater and ART), which are not Heater: This checkbox is only available for the SHT3x available in the other sensor types. series and switches the built-in heater on/off (ticked/not- ticked). Since the heater power is dependent on the supply The viewer software displays relative humidity and voltage, higher temperatures are achievable with larger temperature data on two different windows. It allows for V , and vice versa. Please note the supply voltage of the DD setting absolute or relative timing and change the EK-H5 cannot be changed, it is fixed to 3.3 V. displaying between C and F. The data may be logged, stored and exported to a CSV file, which can be imported ART ON: The SHT3xs unique Accelerated Response to Microsoft Excel. Time (ART) functionality is controlled through this box. This feature electronically speeds up the humidity response of the sensor. This feature only works in periodic mode at 4 Hz and for high-resolution measurements. For this reason the sampling time is set to a predefined value of 0.1 s. Changing the sampling time in this mode only affects the time when the viewer reads out values from the sensor, but it does not affect the acquisition frequency of the sensor itself. Figure 3 Viewer Software window for the SHT3x The viewer Software must be downloaded from the Sensirion web page: