STM32F479AI datasheet(27/208 Pages) STMICROELECTRONICS

27 / 208 page

DocID028010 Rev 2

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STM32F479xx

Functional overview

The following conditions must be respected:

–

During power-on phase (VDD < VDD_MIN), VDDUSB should be always lower than

VDD

–

During power-down phase (VDD < VDD_MIN), VDDUSB should be always lower than

VDD

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

–

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

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

by VDDUSB are operating between VDD_MIN and VDD_MAX.

Figure 7. VDDUSB connected to an external independent power supply

The DSI (Display Serial Interface) sub-system uses several power supply pins which are

independent from the other supply pins:

•

VDDDSI is an independent DSI power supply dedicated for DSI Regulator and MIPI D-

PHY. This supply must be connected to global VDD.

•

VCAPDSI pin is the output of DSI Regulator (1.2V) which must be connected externally

to VDD12DSI.

•

VDD12DSI pin is used to supply the MIPI D-PHY, and to supply clock and data lanes

pins. An external capacitor of 2.2 uF must be connected on VDD12DSI pin.

•

VSSDSI pin is an isolated supply ground used for DSI sub-system.

•

If DSI functionality is not used at all, then:

–

VDDDSI pin must be connected to global VDD.

–

VCAPDSI pin must be connected externally to VDD12DSI but the external

capacitor is no more needed.

–

VSSDSI pin must be grounded.

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