Hardware layout and configuration UM2206
22/55 UM2206 Rev 3
Figure 13. JP6[7-8]: 5V_USB_CHG power source
Caution: Solder bridge SB9 can be used to bypass the USB power protection ST890. (This is not an
ST recommended setting). SB9 can be set in case the board is powered by the USB of the
PC and maximum current consumption on 5V_STLINK does not exceed 100 mA
(including extension board or Arduino shield power consumption). In such condition USB
enumeration will always succeed since no more than 100 mA is requested to the PC.
Configurations of SB9 are summarized in Table 8.
PWR connector:
JP5 [7-8] ON
USB_STLINK: CN1
Table 8. SB9 configurations
Solder
bridge
Default position Power supply Allowed current
SB9
OFF (not soldered)
USB PWR
through CN1
500 mA max limited by ST890
ON (soldered) 100 mA max
OFF (not soldered)
VIN or E5V PWR
Whatever current is: no limitation
ON (soldered)
SB9 must be removed when the board is
powered
(1)
1. SB9 must be removed when the board is powered by E5V (CN5 pin 6) or by V
IN
(CN8 pin 8 or CN5 pin 24).
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