STM32F769AI datasheet(27/255 Pages) STMICROELECTRONICS

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STM32F765xx STM32F767xx STM32F768Ax STM32F769xx

Functional overview

The devices embed two dedicated PLL (PLLI2S and PLLSAI) which allow to achieve audio

class performance. In this case, the I2S and SAI master clock can generate all standard

sampling frequencies from 8 kHz to 192 kHz.

2.16

Boot modes

At startup, the boot memory space is selected by the BOOT pin and BOOT_ADDx option

bytes, allowing to program any boot memory address from 0x0000 0000 to 0x3FFF FFFF

which includes:

•

All Flash address space mapped on ITCM or AXIM interface

•

All RAM address space: ITCM, DTCM RAMs and SRAMs mapped on AXIM interface

•

The System memory bootloader

The boot loader is located in system memory. It is used to reprogram the Flash memory

through a serial interface. Refer to STM32 microcontroller system memory boot mode

application note (AN2606) for details.

2.17

Power supply schemes

•

VDD = 1.7 to 3.6 V: external power supply for I/Os and the internal regulator (when

enabled), provided externally through VDD pins.

•

VSSA, VDDA = 1.7 to 3.6 V: external analog power supplies for ADC, DAC, Reset

blocks, RCs and PLL. VDDA and VSSA must be connected to VDD and VSS, respectively.

•

VBAT = 1.65 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and

backup registers (through power switch) when VDD is not present.

Note:

VDD/VDDA minimum value of 1.7 V is obtained when the internal reset is OFF (refer to

Section 2.18.2: Internal reset OFF). Refer to Table 3: Voltage regulator configuration mode

versus device operating mode to identify the packages supporting this option.

•

VDDSDMMC can be connected either to VDD or an external independent power supply

(1.8 to 3.6V) for SDMMC2 pins (clock, command, and 4-bit data). For example, when

the device is powered at 1.8V, an independent power supply 2.7V 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 should be always lower

than VDD

–

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

lower than VDD

–

The VDDSDMMC rising and falling time rate specifications must be respected (see

Table 20 and Table 21)

–

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

All associated GPIOs powered by VDDSDMMC are operating between

VDDSDMMC_MIN and VDDSDMMC_MAX.

•

VDDUSB can be connected either to VDD or an external independent power supply (3.0

to 3.6V) for USB transceivers (refer to Figure 4 and Figure 5). For example, when the

device is powered at 1.8V, an independent power supply 3.3V can be connected to

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

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