STM32WB15CC datasheet(97/127 Pages) STMICROELECTRONICS

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DS13258 Rev 4

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STM32WB15CC

Electrical characteristics

115

6.3.15

I/O current injection characteristics

As a general rule, current injection to the I/O pins, due to external voltage below VSS or

above VDD (for standard, 3.3 V-capable I/O pins) should be avoided during normal product

operation. However, in order to give an indication of the robustness of the microcontroller in

cases when abnormal injection accidentally happens, susceptibility tests are performed on a

sample basis during device characterization.

Functional susceptibility to I/O current injection

While a simple application is executed on the device, the device is stressed by injecting

current into the I/O pins programmed in floating input mode. While current is injected into

the I/O pin, one at a time, the device is checked for functional failures.

The failure is indicated by an out of range parameter: ADC error above a certain limit (higher

than 5 LSB TUE), out of conventional limits of induced leakage current on adjacent pins (out

of the -5 µA / 0 µA range) or other functional failure (for example reset occurrence or

oscillator frequency deviation).

The characterization results are shown in Table 63.

Negative induced leakage current is caused by negative injection and positive induced

leakage current is caused by positive injection.

6.3.16

I/O port characteristics

General input/output characteristics

Unless otherwise specified, the parameters given in Table 64 are derived from tests

performed under the conditions summarized in Table 21: General operating conditions. All

I/Os are designed as CMOS- and TTL-compliant.

Table 62. Electrical sensitivity

Symbol

Parameter

Conditions

Class

Static latch-up class

TA = +105 °C conforming to JESD78A

Table 63. I/O current injection susceptibility(1)

1. Evaluated by characterization, not tested in production.

Symbol

Description

Functional susceptibility

Unit

Negative

injection

Positive

injection

IINJ

Injected

current

All pins except AT0, AT1, PB0 and PB1

-5

N/A(2)

2. Injection not possible.

AT0, AT1, PB0 and PB1 pins

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