STMicroelectronics STM32F050G6 Manual page 49

STM32F050xx
I/O system current consumption
The current consumption of the I/O system has two components: static and dynamic.
I/O static current consumption
All the I/Os used as inputs with pull-up generate current consumption when the pin is
externally held low. The value of this current consumption can be simply computed by using
the pull-up/pull-down resistors values given in
For the output pins, any external pull-down or external load must also be considered to
estimate the current consumption.
Additional I/O current consumption is due to I/Os configured as inputs if an intermediate
voltage level is externally applied. This current consumption is caused by the input Schmitt
trigger circuits used to discriminate the input value. Unless this specific configuration is
required by the application, this supply current consumption can be avoided by configuring
these I/Os in analog mode. This is notably the case of ADC input pins which should be
configured as analog inputs.
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 measured previously (see
Table 28: Peripheral current
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
I
SW
V
DD
f
SW
C is the total capacitance seen by the I/O pin: C = C
C is the PCB board capacitance including the pad pin.
S
The test pin is configured in push-pull output mode and is toggled by software at a fixed
frequency.
consumption), the I/Os used by an application also contribute to
is the current sunk by a switching I/O to charge/discharge the capacitive load
is the MCU supply voltage
is the I/O switching frequency
Doc ID 023079 Rev 3
Table 45: I/O static
 
I = V f
SW DD SW
Electrical characteristics
characteristics.
C
+ C + C
INT EXT S
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