STM32H723VG datasheet(103/227 Pages) STMICROELECTRONICS

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DS13313 Rev 2

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STM32H723xE/G

Electrical characteristics

208

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 50: 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.

I/O dynamic current consumption

In addition to the internal 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:

where

ISW is the current sunk by a switching I/O to charge/discharge the capacitive load

VDDx is the MCU supply voltage

fSW is the I/O switching frequency

CL is the total capacitance seen by the I/O pin: C = CINT+ CEXT

The test pin is configured in push-pull output mode and is toggled by software at a fixed

frequency.

ISW

VDDx fSW CL

STM32H723VG Datasheet(PDF) 103 Page - STMicroelectronics