STM32MP151AAB3 datasheet(141/253 Pages) STMICROELECTRONICS

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DS12500 Rev 3

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STM32MP151A/D

Electrical characteristics

232

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 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

The I/Os used by an application 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.

The theoretical formula is provided below:

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

6.3.7

Wakeup time from low-power modes

The wakeup times given in Table 26 are measured starting from the wakeup event trigger up

to the first instruction executed by the MPU or MCU:

•

For CSleep modes:

–

the MPU or MCU goes in low-power mode after WFE (Wait For Event) instruction.

•

For CStop modes:

–

MCU goes in low-power mode after WFE (Wait For Event) instruction.

–

MPU goes in low-power mode after WFI (Wait For Interrupt) instruction.

•

WKUPx pin is used to wakeup from low-power modes.

ISW

VDDx fSW CL

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