STM32F070CB datasheet(44/83 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F070CB/RB/C6/F6

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DocID027114 Rev 3

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 45: 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 27. Typical current consumption in Run mode, code with data processing

running from Flash

Symbol

Parameter

Conditions

fHCLK

Typ

Unit

Peripherals

enabled

Peripherals

disabled

IDD

Supply current in Run

mode from VDD

supply

Running from

HSE crystal

clock 8 MHz,

code executing

from Flash

48 MHz

23.5

13.5

8 MHz

4.8

3.1

IDDA

Supply current in Run

mode from VDDA

supply

48 MHz

163.3

µA

8 MHz

2.5

ISW

VDDIOx fSW C

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