STM32F427NET6 datasheet(110/231 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F427xx STM32F429xx

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DocID024030 Rev 6

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 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 35: 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:

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 34. Switching output I/O current consumption(1)

Symbol

Parameter

Conditions

I/O toggling

frequency

(fsw)

Typ

Unit

IDDIO

I/O switching

Current

VDD = 3.3 V

C= CINT(2)

2 MHz

0.0

8 MHz

0.2

25 MHz

0.6

50 MHz

1.1

60 MHz

1.3

84 MHz

1.8

90 MHz

1.9

VDD = 3.3 V

CEXT = 0 pF

C = CINT + CEXT

+ CS

2 MHz

0.1

8 MHz

0.4

25 MHz

1.23

50 MHz

2.43

60 MHz

2.93

84 MHz

3.86

90 MHz

4.07

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