STM32F407IE datasheet(68/154 Pages) STMICROELECTRONICS

68 / 154 page

Electrical characteristics

STM32F405xx, STM32F407xx

68/154

Doc ID 022152 Rev 1

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 43: 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 pins.

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 23: 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 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:

Table 21.

Typical and maximum current consumptions in VBAT mode

(1)

Symbol

Parameter

Conditions

Typ

Max

Unit

TA = 25 °C

TA = 85 °C

TA =

105 °C

VDD =

1.8 V

VDD=

2.4 V

VDD =

3.3 V

VDD = 3.6 V

IDD_VBAT

Backup

domain supply

current

Backup SRAM ON, RTC ON

TBD

TBD(2)

µA

Backup SRAM OFF, low-speed

oscillator and RTC ON

TBD

TBD(2)

Backup SRAM ON, RTC OFF

TBD

TBD(2)

Backup SRAM OFF, RTC OFF

TBD

TBD(2)

TBD stands for “to be defined”.

Based on characterization, not tested in production.

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