Datasheet

Functional overview STM32F745xx STM32F746xx
24/227 DocID027590 Rev 4
Figure 4. V
DDUSB
connected to V
DD
power supply
Figure 5. V
DDUSB
connected to external power supply
2.17 Power supply supervisor
2.17.1 Internal reset ON
On packages embedding the PDR_ON pin, the power supply supervisor is enabled by
holding PDR_ON high. On the other packages, the power supply supervisor is always
enabled.
The device has an integrated power-on reset (POR)/ power-down reset (PDR) circuitry
coupled with a Brownout reset (BOR) circuitry. At power-on, POR/PDR is always active and
ensures proper operation starting from 1.8
V. After the 1.8 V POR threshold level is
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