Datasheet
Electrical characteristics STM32F030x4/x6/x8/xC
50/93 DS9773 Rev 4
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
Table 46: I/O static characteristics.
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, 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 I/O supply voltage to supply the I/O pin circuitry and to
charge/discharge the capacitive load (internal or external) connected to the pin:
Table 28. Typical current consumption in Run mode, code with data processing
running from Flash
Symbol Parameter Conditions f
HCLK
Typ
Unit
Peripherals
enabled
Peripherals
disabled
I
DD
Supply current in Run
mode from V
DD
supply
Running from
HSE crystal
clock 8 MHz,
code executing
from Flash
48 MHz 23.3 11.5
mA
8 MHz 4.5 3.0
I
DDA
Supply current in Run
mode from V
DDA
supply
48 MHz 158 158
µA
8 MHz 2.43 2.43
I
SW
V
DDIOx
f
SW
C××=