As a new STM32 user, I would like to know if it is possible to connect unregulated voltages (6.2V to 9V) to a Power input pin on the headers as same as on the Arduino?

The board I'm using is STM32F769 Discovery Kit with the touchscreen. I would like to power it with a nonregulated battery pack, just to make it portable.

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    \$\begingroup\$ What does the datasheet for the board say? \$\endgroup\$ – Roger Rowland Apr 19 '17 at 13:52

According to page 15 of the specifications (Assuming that's the same kit) you can use a 7-12V DC which may fit your requirement if your supply is over 7V.

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