User manual for I²C-bus RTC demo board OM13515
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© NXP B.V. 2014. All rights reserved.
4. Graphical User Interface with OM13518 USB-I²C-bus dongle
4.1 USB-I²C dongle
Details are described in the user manual UM10789.
The OM13518 dongle is a ready to run module. It creates a virtual COM-port via an USB
connection. It provides three I²C-bus connections with 5 V option to power the application
(max 450 mA).
Power consumption: module/total: <50 mA/max 500 mA
I²C-bus clock frequency: 245 Hz – 400 kHz
USB driver for Windows: Windows XP, Windows 7, Windows 8
Size: 50 mm
× 40 mm × 15 mm
Fig 5. A) Dongle OM13518, B) connected to an evaluation board
4.2 Software GUI
The software control via a GUI allows a fast start to communicate to the different circuits.
Aside from the detailed GUI pages for the Real-Time Clocks, a UNIVERSAL
INTERFACE allows to communicate with any I²C-bus device by entering directly the hex
codes. Example: s A2 28 p
Where s stands for the I²C START and p for the I²C STOP condition.
There are 2 GUI versions:
USB_I2C_GUI_85063TP for the PCF85063TP RTC with basic features, no alarm facility
USB_I2C_GUI_85063A for the full featured PCx85063A RTC
