Si7013USB-DONGLE

8

Rev. 0.7

When the GUI is started, it will recognize the sensors that are connected. The INIT button should be pressed if the

hardware wasn’t connected or was changed after the GUI was started. The analog output devices, Si7007, Si7022,

and Si7023, do not have a device ID capability. Analog output is “advertised” by shorting the SDA pin of the 6-pin

connector low. In these cases the GUI reports “analog output” device because it is not possible to know which

device is connected.

Select temperature units by clicking on the “Select Temperature Units” button.The button will toggle between “Deg

C” and “Deg F” indicating the selection of either degrees Celsius or degrees Fahrenheit.

In the “Enter Sample Interval (seconds)” number box, the time interval between samples can be entered as any

value greater than 0.2 seconds in increments of 0.1 seconds. Depending on the number of devices connected,

sample times less than 1 second might not be possible. In this case, the window will turn red and the sample time

will be as short as possible.

The upper chart by default displays temperature; this can be changed to dew point by clicking on the selection box

located directly under the Silicon Labs logo. The temperature and dew point should always be logged regardless of

setting.

The default Y-axis range on each chart auto-ranges. If desired, the auto-ranging can be turned off and the upper

and lower limits for the charts can be set by clicking on the appropriate box. The same configuration changes can

be made to the X-axis.

If a log of the data is desired, click “START” inside the “Log Data to File” box to begin collecting data. If “Create Log

File?” is enabled, a dialog box will appear requesting a file name and save location. The time base of the log file

can be chosen to be absolute date and time or relative time in seconds. To stop data collection, click “STOP”. To

exit the GUI click “QUIT”.

If an Si7005 or Si7015 evaluation board is connected, the GUI automatically adjusts for the temperature and

non-linearity effect of the RH sensor. (This is not required for the other sensors as this is done internally to the

part). The data logged to file is saved in comma separated value (csv) format, which can be easily opened in a

spreadsheet application such as Microsoft Excel, as shown in Figure 8.

Figure 8. Logged Data Displayed in Excel with Absolute Date and Time Base