STM32U073RCI3 datasheet(66/146 Pages) STMICROELECTRONICS

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6.3.5.1

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 resistors generate a current consumption when the pin is externally held to

the opposite level. The value of this current consumption can be simply computed by using the pull-up/pull-down

resistors values given in Table 64. I/O static characteristics.

For the output pins, any internal or external pull-up or pull-down resistor and 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 measured previously (see Table 44. 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 I/O supply voltage to supply the I/O pin circuitry and to charge/discharge the

internal or external capacitive load connected to the pin:

ISW=VDDIOx×fSW×C

where

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

VDDIOx is the I/O supply voltage

fSW is the I/O switching frequency

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

CS is the PCB board capacitance including the pad pin.

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

6.3.5.2

On-chip peripheral current consumption

The current consumption of the on-chip peripherals is given in Table 44. Peripheral current consumption. The

MCU is placed under the following conditions:

•

All I/O pins are in Analog mode

•

The given value is calculated by measuring the difference of the current consumptions:

–

when the peripheral is clocked on

–

when the peripheral is clocked off

•

Ambient operating temperature and supply voltage conditions summarized in Table 19. Voltage

characteristics

•

The power consumption of the digital part of the on-chip peripherals is given in Table 44. Peripheral current

consumption. The power consumption of the analog part of the peripherals (where applicable) is indicated

in each related section of the datasheet.

STM32U073x8/B/C

Electrical characteristics

DS14548 - Rev 2

page 66/146

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