• If the host is not able to provide the requested current, the enumeration fails. Therefore, the U2 power switch
remains OFF and the MCU part including the extension board is not powered. As a consequence, the LD5
green LED remains OFF. In this case, it is mandatory to use an external power supply.
5V_STLK configuration: The JP6 jumper is set on [1-2] as shown in Figure 10.
Figure 10. JP6 [1-2]: 5V_STLK power source
UM2861
Power supply and power selection
UM2861 - Rev 2
page 18/49
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