Datasheet Evaluation Kit EK-H4 For SHTxx Humidity and Temperature Sensors Ready to use Hard and Software Suitable for data-logging experiments Programmable Interface Dew Point and Energy Calculation Multiple Multiplexer boxes with Sensors Product Summary The evaluation kit EK-H4 is made for running Viewer software (see sensirion.com/ek-h4) it may also be used as a data-logger for simple experimental Sensirions humidity and temperature sensors and to measurements. The EK-H4 is connected to the display measured values. It is able to communicate computer via USB interface. The software may with SHT1x, SHT7x, SHT2x, SHT3x, SHTC1 and SHTW1. The measured values will be displayed on record and display humidity and temperature values the display of the EK-H4. The main purpose of the as well as calculated values of dew point and absolute humidity. It is possible to connect multiple evaluation kit is to demonstrate the unique EK-H4 to different USB ports on the same computer performance of Sensirions humidity and temperature sensors without any own hard or software design and operate them through the same Viewer work. Together with a computer and a dedicated Software. EK-H4 Material Contents The EK-H4 contains the following components, enclosed in a handy suitcase: EK-H4 EK-H4 Flex (Order no. 1-100661-02) (Order no. 1-101068-02) 4 x SHT31 sensors 4 x SHT31 sensors on PCB with connector on FPCB 4 x SHT21 sensors 4 x SHTC1 sensors on PCB with connector. on FPCB 4 x SHTW1 sensors 4 x SHT71 sensors on FPCB 4 x sensor cables with RJ45 4 x sensor cables with RJ45 plug and FPCB connector for plug and pin-type connector connecting sensors on FPCB for connecting sensors with with multiplexer box of 3m multiplexer box of 3m length. length. 1 EK-H4 multiplexer box: to connect up to 4 SHTxx Sensors Figure 1 Schematic of the Evaluation Kit EK-H4. The Evaluation 1 USB cable for connection to computer. Kit works without connection to a computer it only needs a connection to the power socket. Optionally, the EK-H4 can be 1 Power supply unit with US, EU, AU adapter connected to a computer and operated through the Viewer Software. EK-H4 Viewer Software is available from Sensirions Webpage (www.sensirion.com/ek-h4). Device Certification The Evaluation Kit EK-H4 is RoHS and WEEE compliant. www.sensirion.com Version 4 July 2015 1/8 Datasheet EK-H4 Specification Table 1 DC Power Supply: Pin Diagram Electrical specification: Parameter min typ max Unit EK-H4 Circuit Board Input Voltage 8 9 10 V External Supply Input Voltage Ripple 0.5 V Supply Current 170 280 mA 4 sensor channels Input Voltage 4.75 5 5.25 V USB Supply Supply Current 170 280 mA Display Range 1.8 3.0 3.6 V Resolution 0.1 V Sensor Supply 2 buttons for Voltage Accuracy 2 5 % display modes 1 Output current 40 110 mA Temperature Resolution 11 14 Bit Micro Controller Unit Humidity Resolution 8 12 Bit Debug interface Measurement interval 1 1440 s User field Communication USB (via Virtual Com Port (VCP)) connected to MCU Operating 0 to 50C (multiplexer box) Temperature -20 to 70C (cables, sensor) USB interface Reset button Default Configuration Power supply After power-up two different voltages ranges (2.1V to 3.6V Power LED & 1.8V) can be chosen through the push button on the top of the evaluation kit. EK-H4 Pin Assignment Parameter Default value Sensor Supply Voltage 3.0 V Temperature Resolution 12 Bit Humidity Resolution 12 Bit Measurement interval 1 s Heater off 8 1 1 2 3 4 SHT7x on OTP reload SHT2x off 1 2 3 4 2 1 3 4 RJ45 Pin Sensor Pin Name Description Power Supply 1 3 VSS Ground Used Connection EK-H4 supplied from 3 1 SCL Serial clock DC DC (9V) 5 2 VDD Supply voltage DC and USB DC (9V) 7 4 SDA Serial data USB USB (5V) Table 2 Pin Assignments: Female RJ45 pin diagram on the The EK-H4 may be supplied by DC Power Supply Unit at left SHTxx on PCB, SHT71 and SHTxx on FPCB sensors on 9V or USB connection at 5V. Power supply by USB is only the right of the upper panel. possible if USB driver is installed correctly. LED Functions Pin Name Comment LED Function - GND Ground Power LED LED off denotes low supply + Positive voltage (DC < 8V, USB < 4.75V) + 9V Supply Voltage or not connected. RJ45 Green LED Sensor detected Connector Orange LED Measurement is in progress 1 short circuit current www.sensirion.com Version 4 July 2015 2/8