User's Manual l STK-MBa53 UM 100 l © 2013 TQ-Group
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4.2.2
Ethernet 2 / USB 2.0 Hi-Speed Host
A USB hub with integrated Ethernet controller provides three USB 2.0 Hi-Speed host interfaces, as well as the second Ethernet
interface. The hub has an upstream USB port, four downstream USB ports and an Ethernet interface.
The wiring is based on the reference schematic of the LAN9514. The 5 V host voltage is activated and the current is monitored in
each case with the power distribution switches for the USB 2.0 hosts. In case of an overload and / or excessive heat they switch
off the host voltage. The LAN9514 is clocked by an external 25 MHz oscillator
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USB host 1 and 2 are routed to the dual port USB receptacle X9. USB host 3 is routed on header X19.
The RJ45 receptacle X10 provides two status LEDs as well as an integrated magnetics.
Illustration 17: Block diagram USB 2.0 Hi-Speed 1 – 3, Ethernet 2
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±50 ppm (incl. tolerance at 25 °C, drift over temperature range of –40 °C to +85 °C and ageing after 10 years).
