NXP Semiconductors
UM10789
USB-I²C-bus dongle OM13518 with a GUI
UM10789
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© NXP B.V. 2014. All rights reserved.
User manual
Rev. 1 — 19 May 2014
4 of 19
3. Dongle
3.1 Circuit diagram
The dongle establishes the connection between the PC (USB port) and the I
2
C-bus
interface.
Fig 1.
Simplified Block diagram of the OM13518
3.2 Interfacing I
2
C-bus peripherals
The I
2
C-bus peripherals are connected directly with the I
2
C-bus. The 3 connectors Con1,
Con2, and Con3 are connected in parallel and carry the four signals as also imprinted on
the package:
+5 V:
Optional 5 V supply can be used. Total consumption of all 3 outputs must be kept
below 450 mA.
SCL:
Serial CLock line
SDA:
Serial DAta line
GND:
Ground
