Datasheet

DocID027107 Rev 6 97/202
STM32F446xC/E Electrical characteristics
175
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 f
rom 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:
I
SW
V
DD
f
SW
C××=
where
I
SW
is the current sunk by a switching I/O to charge/discharge the capacitive load
V
DD
is the MCU supply voltage
f
SW
is the I/O switching frequency
C is the total capacitance seen by the I/O pin: C = C
INT
+ C
EXT
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
I
DDIO
I/O switching
Current
V
DD
= 3.3 V
C= C
INT
(2)
2 MHz 0.0
mA
8 MHz 0.2
25 MHz 0.6
50 MHz 1.1
60 MHz 1.3
84 MHz 1.8
90 MHz 1.9
V
DD
= 3.3 V
C
EXT
= 0 pF
C = C
INT
+ C
EXT
+ C
S
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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