STM32H533CE datasheet(113/231 Pages) STMICROELECTRONICS

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DS14539 Rev 1

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STM32H533xx

Electrical characteristics

200

I/O system 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 57.

To estimate the current consumption for the output pins, consider also external pull-downs

or loads.

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 Schmitt trigger

circuits used to discriminate the input value. Unless this specific configuration is required by

the application, this current consumption can be avoided by configuring the I/Os in analog

mode. This is notably the case of ADC input pins, to 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 by using pull-up/down resistors, or by configuring the pins in

output mode.

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 + CS

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

frequency.

On-chip peripheral current consumption

The MCU is placed under the following conditions:

•

At startup, all I/O pins are in analog input configuration

•

All peripherals are disabled unless otherwise mentioned

•

The I/O compensation cell is enabled

•

fHCLK is the CPU clock, fPCLK = frcc_cpu_ck, and fHCLK = frcc_cpu_ck.

1. Evaluated by characterization - Not tested in production.

2. LSE is in medium-low drive mode.

ISW

VDDx fSW CL

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