STM32F407ZGT6TR 查看數據表（PDF） - STMicroelectronics

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STM32F407ZGT6TR

ARM Cortex-M4 32b MCU+FPU, 210DMIPS, up to 1MB Flash/192+4KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 15 comm. interfaces & camera

STMicroelectronics 

Description

STM32F405xx, STM32F407xx

Figure 11. Startup in regulator OFF mode: fast VDD slope

- power-down reset risen before VCAP_1/VCAP_2 stabilization

VDD

PDR = 1.7 V or 1.8 V (2)

V12

Min V12

VCAP_1/VCAP_2

NRST

PA0 asserted externally

time

2.2.17

2.2.18

1. This figure is valid both whatever the internal reset mode (onON or offOFF).

2. PDR = 1.7 V for a reduced temperature range; PDR = 1.8 V for all temperature ranges.

Regulator ON/OFF and internal reset ON/OFF availability

time ai18492d

Table 3. Regulator ON/OFF and internal reset ON/OFF availability

Regulator ON

Regulator OFF Internal reset ON

Internal reset

OFF

LQFP64

LQFP100

LQFP144

LQFP176

WLCSP90

UFBGA176

Yes

No

Yes

Yes

BYPASS_REG set BYPASS_REG set

to VSS

to VDD

Yes

Yes

PDR_ON set to

VDD

No

Yes

PDR_ON

connected to an

external power

supply supervisor

Real-time clock (RTC), backup SRAM and backup registers

The backup domain of the STM32F405xx and STM32F407xx includes:

• The real-time clock (RTC)

• 4 Kbytes of backup SRAM

• 20 backup registers

The real-time clock (RTC) is an independent BCD timer/counter. Dedicated registers contain

the second, minute, hour (in 12/24 hour), week day, date, month, year, in BCD (binary-

coded decimal) format. Correction for 28, 29 (leap year), 30, and 31 day of the month are

performed automatically. The RTC provides a programmable alarm and programmable

periodic interrupts with wakeup from Stop and Standby modes. The sub-seconds value is

also available in binary format.

It is clocked by a 32.768 kHz external crystal, resonator or oscillator, the internal low-power

RC oscillator or the high-speed external clock divided by 128. The internal low-speed RC

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DocID022152 Rev 4

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