Datasheet

STM32F051x Electrical characteristics
Doc ID 022265 Rev 3 51/105
Typical current consumption
The MCU is placed under the following conditions:
● V
DD
=V
DDA
=3.3 V
● All I/O pins are in analog input configuration
● The Flash access time is adjusted to f
HCLK
frequency (0 wait states from 0 to 24 MHz,
1 wait state above)
● Prefetch is ON when the peripherals are enabled, otherwise it is OFF
● When the peripherals are enabled, f
PCLK
= f
HCLK
●
PLL is used for frequencies greater than 8 MHz
● AHB prescaler of 2, 4, 8 and 16 is used for the frequencies 4 MHz, 2 MHz, 1 MHz and
500 kHz respectively
● A development tool is connected to the board and the parasitic pull-up current is around
30 µA
Table 30. 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
36 MHz 17.6 9.0
32 MHz 15.9 8.0
24 MHz 12.4 7.5
16 MHz 8.5 5.2
8 MHz 4.5 3.0
4 MHz 2.8 1.9
2 MHz 1.7 1.3
1 MHz 1.3 1.0
500 kHz 1.0 0.9
I
DDA
Supply current in Run
mode from V
DDA
supply
48 MHz 158 158
µA
36 MHz 120 120
32 MHz 108 108
24 MHz 83 83
16 MHz 60 60
8 MHz 2.43 2.43
4 MHz 2.43 2.43
2 MHz 2.43 2.43
1 MHz 2.43 2.43
500 kHz 2.43 2.43