STM32F722IC datasheet(109/229 Pages) STMICROELECTRONICS

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DS11853 Rev 6

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STM32F722xx STM32F723xx

Electrical characteristics

201

6.3.2

VCAP1/VCAP2 external capacitor

Stabilization for the main regulator is achieved by connecting an external capacitor CEXT to

the VCAP1/VCAP2 pins. CEXT is specified in Table 18.

Note:

The VCAP2 pin is not available on the LQFP64 package.

Figure 31. External capacitor CEXT

1. Legend: ESR is the equivalent series resistance.

VDD = 2.4 to

2.7 V

Conversion time

up to 2.4 Msps

24 MHz

216 MHz with 8 wait

states and over-drive

I/O compensation

works

16-bit erase and

program

operations

VDD = 2.7 to

3.6 V(4)

Conversion time

up to 2.4 Msps

30 MHz

216 MHz with 7 wait

states and over-drive

I/O compensation

works

32-bit erase and

program

operations

1. Applicable only when the code is executed from Flash memory. When the code is executed from RAM, no wait state is

required.

2. Thanks to the ART accelerator on ITCM interface and L1-cache on AXI interface, the number of wait states given here

does not impact the execution speed from Flash memory since the ART accelerator or L1-cache allows to achieve a

performance equivalent to 0-wait state program execution.

3. VDD/VDDA minimum value of 1.7 V is obtained with the use of an external power supply supervisor (refer to Section 3.15.2:

Internal reset OFF).

4. The voltage range for USB full speed PHYs can drop down to 2.7 V. However the electrical characteristics of D- and D+

pins will be degraded between 2.7 and 3 V.

Table 17. Limitations depending on the operating power supply range (continued)

Operating

power supply

range

ADC operation

Maximum Flash

memory access

frequency with

no wait states

(fFlashmax)

Maximum HCLK

frequency vs Flash

memory wait states

(1)(2)

I/O operation

Possible Flash

memory

operations

Table 18. VCAP1/VCAP2 operating conditions(1)

1. When bypassing the voltage regulator, the two 2.2 µF VCAP capacitors are not required and should be

replaced by two 100 nF decoupling capacitors.

Symbol

Parameter

Conditions

CEXT

Capacitance of external capacitor

2.2 µF

ESR

ESR of external capacitor

< 2

MS19044V2

ESR

R Leak

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