STM32F769AI datasheet(134/255 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F765xx STM32F767xx STM32F768Ax STM32F769xx

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DocID029041 Rev 4

Caution:

Any floating input pin can also settle to an intermediate voltage level or switch inadvertently,

as a result of external electromagnetic noise. To avoid a current consumption related to

floating pins, they must either be configured in analog mode, or forced internally to a definite

digital value. This can be done either by using pull-up/down resistors or by configuring the

pins in output mode.

I/O dynamic current consumption

In addition to the internal peripheral current consumption (see Table 39: Peripheral current

consumption), the I/Os used by an application also contribute to the current consumption.

When an I/O pin switches, it uses the current from the MCU supply voltage to supply the I/O

pin circuitry and to charge/discharge the capacitive load (internal or external) connected to

the pin:

ISW

VDD fSW C

where

ISW is the current sunk by a switching I/O to charge/discharge the capacitive load

VDD is the MCU supply voltage

fSW is the I/O switching frequency

C is the total capacitance seen by the I/O pin: C = CINT+ CEXT

The test pin is configured in push-pull output mode and is toggled by software at a fixed

frequency.

Table 38. Switching output I/O current consumption(1)

Symbol

Parameter

Conditions

I/O toggling

frequency (fsw)

MHz

Typ

VDD = 3.3 V

Typ

VDD = 1.8 V

Unit

IDDIO

I/O switching

Current

CEXT = 0 pF

C = CINT + CS + CEXT

0.1

0.4

0.2

1.1

0.7

2.4

1.3

3.1

1.6

4.3

2.4

4.9

2.6

100

5.4

2.8

CEXT = 10 pF

C = CINT + CS + CEXT

0.2

0.1

0.6

0.3

1.8

1.1

3.1

2.3

4.6

3.4

9.7

3.6

10.12

5.2

100

14.92

5.4

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