STM32F405 datasheet(93/204 Pages) STMICROELECTRONICS

93 / 204 page

DS8626 Rev 9

93/203

STM32F405xx, STM32F407xx

Electrical characteristics

Additional current consumption

The MCU is placed under the following conditions:

•

All I/O pins are configured in analog mode.

•

The Flash memory access time is adjusted to fHCLK frequency.

•

The voltage scaling is adjusted to fHCLK frequency as follows:

–

Scale 2 for fHCLK ≤ 144 MHz

–

Scale 1 for 144 MHz < fHCLK ≤ 168 MHz.

•

The system clock is HCLK, fPCLK1 = fHCLK/4, and fPCLK2 = fHCLK/2.

•

The HSE crystal clock frequency is 25 MHz.

•

TA= 25 °C.

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 48: 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

Table 26. Typical current consumption in Run mode, code with data processing

running from Flash memory, regulator ON (ART accelerator enabled

except prefetch), VDD = 1.8 V(1)

1. When peripherals are enabled, the power consumption corresponding to the analog part of the peripherals

(such as ADC or DAC) is not included.

Symbol

Parameter

Conditions

fHCLK (MHz)

Typ. at TA =

25 °C

Unit

IDD

Supply current in

Run mode

All peripheral

disabled

160

36.2

144

29.3

120

24.7

19.3

13.4

7.7

6.0

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