STM32F732IE datasheet(27/226 Pages) STMICROELECTRONICS

27 / 226 page

DS11854 Rev 6

27/226

STM32F732xx STM32F733xx

Functional overview

For example, when the device is powered at 1.8 V, an independent power supply 2.7 V

can be connected to VDDSDMMC.When the VDDSDMMC is connected to a separated

power supply, it is independent from VDD or VDDA, but it must be the last supply to be

provided, and the first to disappear. The following conditions VDDSDMMC must be

respected:

–

During the power-on phase (VDD < VDD_MIN), VDDSDMMC must be always lower

than VDD.

–

During the power-down phase (VDD < VDD_MIN), VDDSDMMC must be always lower

than VDD.

–The VDDSDMMC rising and falling time rate specifications must be respected.

–

In the operating mode phase, VDDSDMMC can be lower or higher than VDD:

All associated GPIOs powered by VDDSDMMC are operating between

VDDSDMMC_MIN and VDDSDMMC_MAX.

•

The VDDUSB can be connected either to VDD or to an external independent power

supply (3.0 to 3.6 V) for USB transceivers (refer to Figure 7 and Figure 8).

For example, when the device is powered at 1.8 V, an independent power supply 3.3 V

can be connected to the VDDUSB. When the VDDUSB is connected to a separated power

supply, it is independent from VDD or VDDA, but it must be the last supply to be

provided, and the first to disappear. The following conditions VDDUSB must be

respected:

–

During the power-on phase (VDD < VDD_MIN), VDDUSB must be always lower

than VDD.

–

During the power-down phase (VDD < VDD_MIN), VDDUSB must be always lower

than VDD.

–The VDDUSB rising and falling time rate specifications must be respected.

–

In the operating mode phase, VDDUSB can be lower or higher than VDD:

- If the USB (USB OTG_HS/OTG_FS) is used, the associated GPIOs powered

by VDDUSB are operating between VDDUSB_MIN and VDDUSB_MAX.

- The VDDUSB supplies both USB transceiver (USB OTG_HS and USB OTG_FS).

If only one USB transceiver is used in the application, the GPIOs associated to the

other USB transceiver are still supplied by VDDUSB.

- If the USB (USB OTG_HS/OTG_FS) is not used, the associated GPIOs powered

by VDDUSB are operating between VDD_MIN and VDD_MAX.

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