STM32WB55 datasheet(135/193 Pages) STMICROELECTRONICS

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DS11929 Rev 11

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STM32WB55xx STM32WB35xx

Electrical characteristics

169

All I/Os are CMOS- and TTL-compliant (no software configuration required). Their

characteristics cover more than the strict CMOS-technology or TTL parameters, as shown

in Figure 27 .

Figure 27. I/O input characteristics

Output driving current

The GPIOs (general purpose input/outputs) can sink or source up to ±8 mA, and sink or

source up to ± 20 mA (with a relaxed VOL / VOH).

In the user application, the number of I/O pins that can drive current must be limited to

respect the absolute maximum rating specified in Section 6.2.



The sum of the currents sourced by all the I/Os on VDD, plus the maximum

consumption of the MCU sourced on VDD, cannot exceed the absolute maximum rating

ΣIVDD (see Table 20: Voltage characteristics).



The sum of the currents sunk by all the I/Os on VSS, plus the maximum consumption of

the MCU sunk on VSS, cannot exceed the absolute maximum rating ΣIVSS (see

Table 20: Voltage characteristics).

Output voltage levels

Unless otherwise specified, the parameters given in the table below are derived from tests

performed under the ambient temperature and supply voltage conditions summarized in

Table 24: General operating conditions. All I/Os are CMOS- and TTL-compliant (FT or TT

unless otherwise specified).

7. To sustain a voltage higher than Min(VDD, VDDA, VDDUSB, VLCD) + 0.3 V, the internal pull-up and pull-down resistors must

be disabled. All FT_xx IO except FT_lu, FT_u and PC3.

8. Pull-up and pull-down resistors are designed with a true resistance in series with a switchable PMOS/NMOS, whose

contribution to the series resistance is minimal (~10%).

0.5

1.5

2.5

1.5

2.5

3.5

Vil-Vih (all IO except BOOT0)

cmos vil spec 30%

cmos vih spec 70%

ttl vil spec ttl

ttl vih spec ttl

datasheet Vil_rule

datasheet Vih_rule

TTL requirement Vih min = 2V

TTL requirement Vil min = 0.8V

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