STM32H757AI datasheet(131/251 Pages) STMICROELECTRONICS

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DS12931 Rev 1

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STM32H757xI

Electrical characteristics

230

I/O dynamic current consumption

In addition to the internal peripheral current consumption (see Table 49: Peripheral current

consumption in Run mode), 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:

ISW

VDDx fSW CL

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.

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.

•

frcc_c_ck is the CPU clock. fPCLK = frcc_c_ck/4, and fHCLK = frcc_c_ck/2.

The given value is calculated by measuring the difference of current consumption

–

with all peripherals clocked off

–

with only one peripheral clocked on

–frcc_c_ck = 480 MHz (Scale 0), frcc_c_ck = 400 MHz (Scale 1), frcc_c_ck = 300 MHz

(Scale 2), frcc_c_ck = 200 MHz (Scale 3)

•

The ambient operating temperature is 25 °C and VDD=3.3 V.

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