STM32F303C6 datasheet(74/115 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F303x6/x8

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DocID025083 Rev 5

6.3.13

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 V-capable I/O pins) should be avoided during normal product

operation. However, 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 –5 µA/+0 µA range), or other functional failure (for example reset occurrence or oscillator

frequency deviation). The test results are given in Table 51: I/O current injection

susceptibility.

Table 51. I/O current injection susceptibility

Symbol

Description

Functional susceptibility

Unit

Negative

injection

Positive

injection

IINJ

Injected current on BOOT0

– 0

Injected current on PC0, PC1, PC2, PC3 (TTa pins)

and PF1 pin (FT pin)

-0

Injected current on PA0, PA1, PA2, PA3, PA4, PA5,

PA6, PA7, PC4, PC5, PB0, PB1, PB2, PB12, PB13,

PB14, PB15 with induced leakage current on other

pins from this group less than -100 µA or more than

+900 µA

-5

Injected current on PB11, other TT, FT, and FTf pins

– 5

Injected current on all other TC, TTa and RESET

pins

– 5

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