5V_EXT is the DC power coming from an external 5V DC power source from the ST morpho connector (CN11)
pin 6. The 5V jumper selection (JP6) must be on pin [5-6] to select the 5V_EXT power source on the JP6
connector, and must be connected as shown in Figure 11.
Figure 11. JP6 [5-6]: 5V_EXT power source
UM2861
Power supply and power selection
UM2861 - Rev 5
page 19/49