STM32H563MI datasheet(142/270 Pages) STMICROELECTRONICS

142 / 270 page

Electrical characteristics

STM32H562xx and STM32H563xx

142/270

DS14258 Rev 5

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 58.

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.

Table 37. Typical and maximum current consumption in VBAT mode(1)

Symbol

Parameter

Conditions

Typ

Max

Unit

Backup

RAM

RTC and

LSE(2)

1.8 V 2.4 V

3 V

3.3 V

TJ =

25 °C

TJ =

85 °C

TJ =

105 °C

TJ =

130 °C

IDD(VBAT)

Supply current

in VBAT mode

OFF

0.01

0.02

0.2

2.45

6.2

19.0

μA

OFF

1.11

1.14

1.17

1.29

4.5

16.05

30.0

72.2

OFF

0.45

0.46

0.48

0.59

1.2

3.65

7.5

21.0

1.56

1.57

1.62

1.84

5.5

17.25

31.3

74.2

1. Evaluated by characterization - Not tested in production.

2. LSE is in medium-low drive mode.

ISW

VDDx fSW CL

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