STM32WBA62CG datasheet(125/185 Pages) STMICROELECTRONICS

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DS14736 Rev 1

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STM32WBA6xxx

Electrical characteristics

169

Caution:

Any floating input pin can 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 be configured in analog mode, or forced internally to a definite digital value.

This can be done by using pull-up/down resistors, or by configuring the pins in output mode.

I/O dynamic current consumption

The I/Os used in application increase the consumption measured previously (see Table 55).

When an I/O pin switches, it uses the current from the I/O supply voltage to supply the pin

circuitry, and to charge/discharge the capacitive load (internal and external) connected to it:

where:

•

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

•

VDD 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

–CINT is the I/O pin capacitance

–CEXT is any connected external device pin capacitance

–CS is the PCB board capacitance

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

frequency.

On-chip peripheral current consumption

The power consumption of the digital part of the peripherals is given in Table 55, while that

of the analog part (when applicable) is indicated in the related sections.

The MCU is put 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

•

The ambient operating temperature and supply voltage conditions summarized in

Table 30

ISW

VDD fSW C

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