STM32F446VC datasheet(73/201 Pages) STMICROELECTRONICS

73 / 201 page

DocID027107 Rev 5

73/201

STM32F446xC/E

Electrical characteristics

174

6.1.6

Power supply scheme

Figure 18. Power supply scheme

1. VDDA and VSSA must be connected to VDDand VSS, respectively.

2. VDDUSB is a dedicated independent USB power supply for the on-chip full-speed OTG PHY module and

associated DP/DM GPIOs. Its value is independent from the VDD and VDDA values, but must be the last

supply to be provided and the first to disappear. If VDD is different from VDDUSB and only one on-chip OTG

PHY is used, the second OTG PHY GPIOs (DP/DM) are still supplied at VDDUSB (3.3V).

3. VDDUSB is available only on WLCSP81, UFBGA144 and LQFP144 packages. For packages where VDDUSB

pin is not available, it is internally connected to VDD.

4. VCAP_2 pad is not available on LQFP64.

Caution:

Each power supply pair (VDD/VSS, VDDA/VSSA...) must be decoupled with filtering ceramic

capacitors as shown above. These capacitors must be placed as close as possible to, or

below, the appropriate pins on the underside of the PCB to ensure good operation of the

device. It is not recommended to remove filtering capacitors to reduce PCB size or cost.

This might cause incorrect operation of the device.

STM32F446VC 데이터시트(PDF) 73 Page - STMicroelectronics