External power supply input from external 3.3 V
When the 3.3 V is provided by a shield board, it is interesting to use the 3.3 V (CN6 pin 4 or CN7 pin 16) directly
as power input (refer to Table 9 and Figure 14). In this case, the programming and debugging features are not
available, since the ST-LINK is not powered.
Table 9. External power sources: 3V3
Input power name Connector pins Voltage range Maximum current
3V3
CN6 pin 4
CN7 pin 16
3 V to 3.6 V 1.3 A
UM2505
Power supply
UM2505 - Rev 2
page 20/43
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