STM32H747AI datasheet(131/252 Pages) STMICROELECTRONICS

131 / 252 page

DS12930 Rev 1

121/242

STM32H747xI/G

Electrical characteristics

221

Figure 20. Typical SMPS efficiency (%) vs load current (A) in low-power mode at

TJ = TJmax

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 a 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 71: I/O static characteristics.

For the output pins, any external pull-down or external load must also be considered to

estimate the current consumption.

An 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 a 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.

MSv62427V1

100

0.00001

0.0001

0.001

0.01

0.1

VDDSMPS =

1.8V, SVOS5

VDDSMPS =

3.3V, SVOS5

VDDSMPS =

1.8V, SVOS4

VDDSMPS =

3.3V, SVOS4

VDDSMPS =

1.8V, SVOS3

VDDSMPS =

3.3V, SVOS3

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