STM32F415RG datasheet(110/186 Pages) STMICROELECTRONICS

110 / 186 page

Electrical characteristics

STM32F415xx, STM32F417xx

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DocID022063 Rev 4

5.3.15

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 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 susceptibilty 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 (>5

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

5 uA/+0 uA range), or other functional failure (for example reset, oscillator frequency

deviation).

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

leakage current by positive injection.

The test results are given in Table 46.

5.3.16

I/O port characteristics

General input/output characteristics

Unless otherwise specified, the parameters given in Table 47 are derived from tests

performed under the conditions summarized in Table 14. All I/Os are CMOS and TTL

compliant.

Table 45. Electrical sensitivities

Symbol

Parameter

Conditions

Class

Static latch-up class

TA = +105 °C conforming to JESD78A

II level A

Table 46. I/O current injection susceptibility

Symbol

Description

Functional susceptibility

Unit

Negative

injection

Positive

injection

IINJ(1)

1. It is recommended to add a Schottky diode (pin to ground) to analog pins which may potentially inject

negative currents.

Injected current on all FT pins

–5

Injected current on any other pin

–5

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