STM32F479AI datasheet(107/217 Pages) STMICROELECTRONICS

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STM32F479xx

Electrical characteristics

190

Figure 28. Typical VBAT current consumption

(RTC ON / backup SRAM ON and LSE in High drive mode)

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 58: 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 (see Table 33), the I/Os used by

an application also contribute to the current consumption. When an I/O pin switches, it uses

20406080

100

Temperature (°C)

1.65V

1.70V

1.80V

2.00V

2.40V

2.70V

3.00V

3.30V

3.60V

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